Bedrock geologic map of the Livengood SW C-3 and SE C-4 quadrangles, Tolovana mining district, Alaska

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What does this data set describe?

Title:
Bedrock geologic map of the Livengood SW C-3 and SE C-4 quadrangles, Tolovana mining district, Alaska
Abstract:
The Preliminary Interpretive Report 2004-3B, "Bedrock geologic map of the Livengood SW C-3 and SE C-4 quadrangles, Tolovana mining district, Alaska," is the bedrock geologic map of an approximately 123-square-mile area in the central Livengood Quadrangle, Alaska.
Supplemental_Information:
The 16 layers listed below are present as shape files. For printing or viewing from a GIS environment, the layers are listed in order of topmost layer to bottommost layer. Attribute information for the 16 layers (entities) is included in this metadata file under the "Entity_and_Attribution_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Data_Layer".
lvg_ages	point locations of age data
lvg_fossils	point locations of fossil data
lvg_structure 	point locations of bedding and foliation orientation data
PD_97TLdh	point locations of drill holes from Placer Dome Exploration, Inc. 1997 Tolovana project
lvg_foldsymbols	symbols depicting fold types and orientations
lvg_faultsymbols	symbols and text depicting fault movement
lvg_dikeoriented	dike strike and trend orientations from DGGS mapping
lvg_dikes	dike locations and compositions from DGGS mapping
lvg_industrydikes	dike locations from industry data
lvg_xsectlines	cross-section traces
livfold_polyline	axial traces of folds
bedcont	stratigraphic, intrusive, and fault (including thrust) contacts
lvgborder	border of the map area
lvgshtdk	polygon containing large number of industry-located igneous rock samples
lmst	areas of limestone within the Amy Creek dolomite unit (lPzZd)
bedpolys	bedrock unit polygons
  1. How should this data set be cited?

    Athey, J.E., Szumigala, D.J., Newberry, R.J., Werdon, M.B., and Hicks, S.A., 2004, Bedrock geologic map of the Livengood SW C-3 and SE C-4 quadrangles, Tolovana mining district, Alaska: Preliminary Interpretive Report PIR 2004-3B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:50,000

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -148.750
    East_Bounding_Coordinate: -148.250
    North_Bounding_Coordinate: 65.625
    South_Bounding_Coordinate: 65.500

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 2001
    Ending_Date: 2004
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: Map and vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set.

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -147
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000032
      Ordinates (y-coordinates) are specified to the nearest 0.000032
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.

  7. How does the data set describe geographic features?

    lvg_ages.shp
    Object type is point, there are 13 rows associated with this entity, and the entity values refer to locations and information pertaining to radiometric ages (Source: Alaska Division of Geological & Geophysical Surveys)

    SAMPLENO
    Generic example of unique sample identifier: YearAAA999X: Year=4 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala. See attributes "AR_REF" and "OTHER_REF" for source citation of information on sample numbers not in this format. (Source: Alaska Division of Geological & Geophysical Surveys and others (see reference attribute information))

    Unique sample identifier

    MAPNO
    Symbol identifying sample location on map. (Source: This report)

    ValueDefinition
    ---Location of sample is outside of map area and not shown on map

    Unique identifier for each sample. Letters correspond to sample type: A = Ar/Ar, K = K/Ar, S = Sm/N

    EASTING
    Easting (Source: UTM Zone 6, NAD 27 (see Spatial_Reference_Information))

    Range of values
    Minimum:421700
    Maximum:434278
    Units:meters

    NORTHING
    Northing (Source: UTM Zone 6, NAD 27 (see Spatial_Reference_Information))

    Range of values
    Minimum:7261024
    Maximum:7268767
    Units:meters

    ABBREV
    Abbreviation of bedrock unit in which the sample was located (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    CgsGREENSTONE
    CmgMETAGABBRO
    Cmg(?)METAGABBRO?
    KmkMONEY KNOB PLUTON
    lPzZmbAMY CREEK METABASALT
    TlLAMPROPHYRE DIKE
    KaMONZONITE TO SYENITE DIKES

    MINERAL
    Mineral or whole rock sample analyzed for age determination (Source: Alaska Division of Geological & Geophysical Surveys and others)

    Mineral or whole rock sample analyzed for age determination

    ARAR_AGE
    Best age determined by 40Ar/39Ar method; see "AGE_TYPE" attribute information for method of age calculation (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    ---Age not determined by 40Ar/39Ar method

    Age of sample with 1-sigma error in units 'millions of years ago' (Ma); one sample was analyzed twice

    AGE_TYPE
    Method used to calculate the best 40Ar/39Ar age (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    integratedIntegrated age determined from total gas measured, equivalent to potassium-argon (K-Ar) age
    plateauPlateau age defined as three or more gas fractions, with a Mean Standard Weighted Deviation (MSWD) < ~2.5, and with more than 50% 39Ar released
    ---Age not determined by 40Ar/39Ar method

    OTHER_AGE
    Age determined by K-Ar or Sm-Nd method (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    ---Age not determined by K-Ar or Sm-Nd method

    Age of sample with 1-sigma error in units 'millions of years ago' (Ma)

    ROCK_TYPE
    Description of sample collected for dating (Source: Alaska Division of Geological & Geophysical Surveys and others)

    Sample description

    AR_REF
    References for 40Ar/39Ar data, see Source information (Source: Alaska Division of Geological & Geophysical Surveys and others (see Source information))

    ValueDefinition
    Athey and others, 2004aReference for collection of Livengood Quadrangle 40Ar/39Ar and K-Ar age data
    This studyWork conducted for this study; raw data not published in Athey and others (2004a)
    ---No reference, age not from 40Ar/39Ar data

    OTHER_REF
    References for K-Ar and Sm-Nd data, see Source information (Source: Alaska Division of Geological & Geophysical Surveys and others (see Source information))

    ValueDefinition
    Rinehart and others, 1997Reference for K-Ar data
    This studySm-Nd date is in process
    ---No reference, age not from K-Ar or Sm-Nd data

    lvg_fossils.shp
    Object type is point, there are 24 rows associated with this entity, and the entity values refer to information pertaining to fossil localities (Source: Alaska Division of Geological & Geophysical Surveys)

    SAMPLE
    Generic example of unique sample identifier: YearAAA999X: Year=4 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala, LF - Larry Freeman. See reference for information on sample numbers not in this format. (Source: Alaska Division of Geological & Geophysical Surveys and others (see reference attribute information))

    Unique sample identifier

    MAPNO
    Symbol identifying fossil location on map (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique map number for each sample

    EASTING
    Easting (Source: UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information))

    Range of values
    Minimum:419133
    Maximum:442526
    Units:meters

    NORTHING
    Northing (Source: UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information))

    Range of values
    Minimum:7263542
    Maximum:7278410
    Units:meters

    MEGAFOSSIL
    Description of type of megafossil identified (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    ---Sample was not examined for megafossils

    Description of megafossil

    IDENT
    Analyst or agency who identified the megafossil (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    DGGSPersonnel from Alaska Division of Geological & Geophysical Surveys
    Blodgett, R.B.U.S. Geological Survey, 4200 University Drive, Anchorage, Alaska 99508
    ---Sample was not examined for megafossils

    AGE
    Age of identified macrofossil (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    ---No macrofossils were identified in order to provide an age

    Geologic age of identified macrofossil

    MICROFOSSI
    Description of type of microfossil identified in hand sample, thin section, or leached-carbonate residue (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    ---Samples were not examined for microfossils

    Description of microfossil

    IDENT0
    Analyst who identified microfossil (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    C.D. BlomeSee source Weber and others, 1994
    DGGSPersonnel from Alaska Division of Geological & Geophysical Surveys
    Weber, F.R.See source Weber and others, 1994
    N.M. SavageDepartment of Geological Sciences, 1272 University of Oregon, Eugene, Oregon 97403-1272
    Blodgett, R.B.U.S. Geological Survey, 4200 University Drive, Anchorage, Alaska 99508
    ---Samples were not examined for microfossils

    AGE0
    Age of identified microfossil (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    ---No microfossils were identified in order to provide an age

    Geologic age of microfossils

    ROCK_TYPE
    Sample description of fossil-bearing rock (Source: Alaska Division of Geological & Geophysical Surveys and others)

    Sample description

    REFERENCE
    Megafossil or microfossil references; see Source_Information (Source: Alaska Division of Geological & Geophysical Surveys and others (see Source information))

    ValueDefinition
    Blodgett, 1992Fossil reference
    This studySamples collected during this study
    Weber and others, 1994Fossil reference

    ABBREV
    Bedrock units from which fossil samples were collected; C designates Cambrian age (Source: Alaska Division of Geological & Geophysical Surveys and others)

    ValueDefinition
    CwlMETAGABBRO
    DcMETAGABBRO
    OldMONEY KNOB PLUTON
    SlAMY CREEK METABASALT
    SsLAMPROPHYRE DIKE
    lPzZdMONZONITE TO SYENITE DIKES
    lPzZmcAMY CREEK SILICEOUS MUDSTONE AND CHERT

    lvg_structure.shp
    Object type is point, there are 120 rows associated with this entity, and the entity values refer to bedding and foliation orientation data (Source: Alaska Division of Geological & Geophysical Surveys)

    SAMPLENO
    Generic example of unique sample identifier: YearAAA999X: Year=4 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: MBW - Melanie Werdon, JEA - Jennifer Athey, RN - Rainer Newberry, Z - Dave Szumigala, LF - Larry Freeman. (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample identifier.

    EASTING
    UTM Zone 6, NAD 27 (see Spatial_Reference_Information) (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:419404
    Maximum:441636
    Units:meters

    NORTHING
    UTM Zone 6, NAD 27 (see Spatial_Reference_Information) (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:7265210
    Maximum:7278083
    Units:meters

    STRIKE
    Strike of plane in "Right-hand rule", where north is 0 and degrees increase clockwise to 360, always 90 degrees counter-clockwise from dip direction (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0
    Maximum:350
    Units:degrees

    DIP
    Degrees that a plane is inclined relative to horizontal, horizontal being 0 degrees, vertical being 90 degrees; always 90 degrees clockwise from strike (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:2
    Maximum:90
    Units:degrees

    STRUCTURE
    Type of structure to which the orientation data apply (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    foliationFoliation
    vertical foliationVertical foliation
    beddingBedding
    vertical beddingVertical bedding

    Quadrant
    Obsolete - This was a necessary field for programmatic placment of dip numbers around the structure symbol (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1
    Maximum:4
    Units:degrees

    PD_97TLdh.shp
    Object type is point, there are 9 rows associated with this entity, and the entity values refer to diamond drill hole locations from Placer Dome Exploration, Inc.'s 1997 Tolovana project (Source: Alaska Division of Geological & Geophysical Surveys)

    EASTING
    Easting (Source: UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information))

    Range of values
    Minimum:427625
    Maximum:433265
    Units:meters

    NORTHING
    Northing (Source: UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information))

    Range of values
    Minimum:7265475
    Maximum:7269377
    Units:meters

    PD_HOLE
    Placer Dome Exploration, Inc. drill hole number (Source: Alaska Division of Geological & Geophysical Surveys and others (see Source information "Minehane and Rogers, 1997"))

    Unique number

    LOC_NOTE
    Originator and information pertaining to location data (Source: Alaska Division of Geological & Geophysical Surveys and others (see Source information))

    ValueDefinition
    DGGS estimateLocation estimated from Placer Dome Exploration, Inc. notes stating the 97-TL6 collar is near the junction of Amy and Lucille creeks, and the bedrock at the location was siliceous dolomite
    GPS location by DGGSCollar located in the field by DGGS and location measured with a Garmin 12XL GPS
    Minehane and Rogers, 1997Collar location estimated from Placer Dome Exploration, Inc. 1997 Tolovana project map; see Source information

    lvg_foldsymbols.shp
    Object type is point, there are 40 rows associated with this entity, and the entity values refer to symbols depicting fold types and orientations (Source: Alaska Division of Geological & Geophysical Surveys)

    TYPE
    Type of fold symbol (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    anticline symbolAnticline symbol
    over anti symbolOverturned anticline symbol
    over syn symbolOverturned syncline symbol
    plunge symbolPlunge direction of the fold
    syncline symbolSyncline symbol

    PLUNGE
    Number indicating angle of plunge measured or estimated downward from horizontal (if known) (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLPlunge is not recorded for this type of symbol

    Range of values
    Minimum:5
    Maximum:50
    Units:degrees

    lvg_faultsymbols.shp
    Object type is point, there are 39 rows associated with this entity, and the entity values refer to symbols and text depicting fault information and relative fault movement (Source: Alaska Division of Geological & Geophysical Surveys)

    TYPE
    Explanation of records in attribute "TEXT" (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    continuation of fault unk'?' marks where the fault trace can no longer be mapped (aka 'unknown')
    down-thrown'D' marks down-thrown side of fault
    up-thrown'U' marks up-thrown side of fault
    right lateralFaults interpreted with right lateral movement
    named faultProminent fault with name

    MAP_TEXT
    Map text for fault plane relative movement, uncertain continuation of faults, and named faults (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    ?Continuation of fault unknown
    DDown-thrown side of fault
    UUp-thrown side of fault
    MYRTLE CREEK FAULTMyrtle Creek Fault
    VICTORIA CREEK FAULTVictoria Creek Fault
    NullNo text string is necessary for this record

    lvg_dikeoriented.shp
    Object type is vector, there are 5 rows associated with the entity, and the entity values refer to dikes with measured strike or trend (Source: Alaska Division of Geological & Geophysical Surveys)

    SAMPLENO
    Generic example of unique sample identifier: YearAAA999X: Year=4 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: MBW - Melanie Werdon, RN - Rainer Newberry (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample identifier.

    EASTING
    UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information) (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:429249
    Maximum:434090
    Units:meters

    NORTHING
    UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information) (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:7264828
    Maximum:7267650
    Units:meters

    TREND
    Angle of strike of dike, strike and dip recorded using "right-hand rule"; trend recorded where strike is unmeasurable; trend recorded in horizontal plane of dip-direction; see Attribute "Note" for further explanation of data (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:10
    Maximum:300
    Units:degrees

    DIP_PLUNGE
    Dip of the dike (if known), no "0" degree horizontal sills in this dataset - see Attribute "Note" for further explanation of data (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:58
    Maximum:90
    Units:degrees

    NOTES
    Further explanation of dike orientation data. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    1Strike of dike with fixed-length line indicating orientation; point location of measurement indicated by easting and northing
    2Trend of dike where strike and dip cannot be measured, fixed-length line indicating orientation; point location of measurement indicated by easting and northing

    lvg_dikes.shp
    Object type is point, there are 47 rows associated with this entity, and the entity values refer to dike locations and compositions from DGGS mapping (Source: Alaska Division of Geological & Geophysical Surveys)

    SAMPLENO
    Generic example of unique sample identifier: YearAAA999X: Year=4 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: MBW - Melanie Werdon, JEA - Jennifer Athey, RN - Rainer Newberry, Z - Dave Szumigala. (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample identifier.

    EASTING
    UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information) (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:421051
    Maximum:434487
    Units:meters

    NORTHING
    UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information) (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:7264828
    Maximum:7269125
    Units:meters

    TYPE
    Type of dike composition (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    Olivine clinopyroxeniteOlivine clinopyroxenite
    GraniteGranite
    LamprophyreLamprophyre
    Quartz monzodioriteQuartz monzodiorite
    Quartz monzoniteQuartz monzonite
    Quartz syeniteQuartz syenite
    SyeniteSyenite
    Undifferentiated alkalicUndifferentiated alkalic
    Undifferentiated calc alkalicUndifferentiated calc alkalic
    Undifferentiated felsicUndifferentiated felsic

    UNIT
    Bedrock unit associated with dike; "C" designates Cambrian age (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    KaMONZONITE TO SYENITE DIKES
    TlLAMPROPHYRE DIKE
    CcOLIVINE CLINOPYROXENITE DIKE
    KaMONZONITE TO SYENITE DIKES
    ---Dike is equivalent to either unit Ka or Kc

    lvg_industrydikes.shp
    Object type is point, there are 43 rows associated with this entity, and the entity values refer to felsic rock sample locations from mineral industry data; location error varies between sources and is largely unknown but estimated to be between 10 m and 500 m; some samples were collected from colluvial units and may not represent underlying bedrock (Source: Alaska Division of Geological & Geophysical Surveys)

    EASTING
    Easting (Source: UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information))

    Range of values
    Minimum:426936
    Maximum:435924
    Units:meters

    NORTHING
    Northing (Source: UTM Zone 6, NAD 27 Alaska (see Spatial_Reference_Information))

    Range of values
    Minimum:7264791
    Maximum:7271164
    Units:meters

    REFERENCE
    Source reference for the dikes (Source: Alaska Division of Geological & Geophysical Surveys and others (see Source information))

    ValueDefinition
    1981-1984 soil grid (E. Twelker); Hanneman, 1998See source information
    Freeman, 1997See source information
    Freeman, 2003See source information
    Hite, 1977See source information
    Minehane and Rogers, 1997See source information; some dikes may be from drill holes

    lvg_xsectlines.shp
    Object type is vector, there are 3 rows associated with this entity, and the entity values refer to cross section traces (Source: Alaska Division of Geological & Geophysical Surveys)

    XSECT
    Letter identifying cross section on the map sheet, example A-A' (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:A
    Maximum:C
    Units:Alpha characters

    livfold_polyline.shp
    Object type is vector, there are 30 rows associated with this entity, and the entity values refer to axial traces of folds (Source: Alaska Division of Geological & Geophysical Surveys)

    TYPE
    Type of fold (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    anticlineAnticline
    overantiOverturned anticline
    oversynOverturned syncline
    synclineSyncline

    bedcont.shp
    Object type is vector, there are 436 rows associated with this entity, and the entity values refer to stratigraphic, intrusive, and fault contacts (Source: Alaska Division of Geological & Geophysical Surveys)

    AGE
    Petains to thrust faults (TYPE value 'Thrust'); "Permian" or "Early K", NULL = non-applicable (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    PermianThrust faults with possible Permian movement; timing of Cambrian ophiolite assemblage emplacement over the lower Paleozoic to Late Proterozoic Amy Creek units may be constrained by 40Ar/39Ar ages reset to 200-250 Ma (Athey and others, 2004a)
    Early KThrust faults with possible Early Cretaceous movement; in the Money Knob area, the Cascaden Ridge sedimentary unit (Dc) is thrusted over the Cambrian ophiolite and Amy Creek assemblages. Emplacement of the Dc unit may be a later event, accommodating stresses related to compression of the Manley basin.
    <NULL>Contacts with no movement or with an unknown age of movement

    TYPE
    Type of contact (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    ThrustLow-angle reverse fault; "Permian or Early K"
    ContactStratigraphic or intrusive contacts
    Contact uknUnconformable contact or thrust fault; regionally interpreted to be an unconformable contact (Foster, 1966; Weber and others, 1992); in the Money Knob area the contact is a thrust fault (this study)
    FaultHigh-angle fault
    strat/fault?Contact or high-angle fault; regionally the contact between units PDs and Trg is interpreted as a high-angle fault (this study); in the map area, the relationship between unit TrDs and adjacent units Trg and PDs is unclear

    lvgborder.shp
    Object type is vector, there is 1 row associated with this entity, and the entity value refers to border of map area (Source: Alaska Division of Geological & Geophysical Surveys)

    lvgshtdk.shp
    Object type is vector, there is 1 row associated with this entity, and the entity value refers to area containing an anomalously high number of undifferentiated felsic(?) igneous samples collected by the mineral industry; some samples were collected from colluvial units and may not represent underlying bedrock (Source: Alaska Division of Geological & Geophysical Surveys)

    lmst.shp
    Object type is vector, there are 5 rows associated with this entity, and the entity values refer to rare limestone within the Amy Creek dolomite unit (lPzZd) (Source: Alaska Division of Geological & Geophysical Surveys)

    Type
    Type of bedrock (Source: Alaska Division of Geological & Geophysical Surveys)

    Rock type is limestone

    bedpolys.shp
    Object type is vector, there are 171 rows associated with this entity, and the entity values refer to bedrock geologic polygons (Source: Alaska Division of Geological & Geophysical Surveys)

    UNIT
    bedrock unit labels; "C" designates Cambrian age (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    CgsGREENSTONE
    ClgLAYERED METAGABBRO
    CmgMETAGABBRO
    CsSERPENTINITE, METAGABBRO, AND GREENSTONE
    CwlWICKERSHAM LIMESTONE
    CZwaWICKERSHAM SHALE
    DcSANDSTONE, SHALE, AND CONGLOMERATE
    KmkMONEY KNOB PLUTON
    KoOLIVE CREEK PLUTON
    KrcRUTH CREEK PLUTON
    lPzZdAMY CREEK DOLOMITE AND LIMESTONE
    lPzZmbAMY CREEK METABASALT
    lPzZmcAMY CREEK SILICEOUS MUDSTONE AND CHERT
    OldLIVENGOOD DOME CHERT
    PDsSHALE
    SlLOST CREEK LIMESTONE
    SsLOST CREEK SANDSTONE, SILTSTONE, SHALE, AND CONGLOMERATE
    TrDsSANDSTONE, SHALE, AND CHERT
    TrgRAMPART GABBRO, QUARTZ GABBRO, AND MINOR CHERT


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    This project is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). Partial funding for the geologic mapping, geochronologic dates, and geochemical analyses performed for this project was also provided through the U.S. Geological Survey STATEMAP Program under award number 03HQAG0055.

  3. To whom should users address questions about the data?


Why was the data set created?

The bedrock geologic map was produced from field work in 2003 by mineral-resource personnel from the Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks. Additional mapping by DGGS personnel in 2001 was incorporated into the project. The purpose of the project is to provide 1:50,000-scale geologic mapping of the Livengood airborne geophysical survey area. The Livengood airborne geophysical surveyhelicopter-based survey included aeromagnetic and electromagnetic data which were released by DGGS in 1999. The geophysical survey and geologic mapping are part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program, a special multi-year investment by the State of Alaska to expand Alaska's geologic and mineral resources knowledge base, catalyze future private-sector mineral exploration and development, and guide state planning.


How was the data set created?

  1. From what previous works were the data drawn?

    Albanese, 1983 (source 1 of 44)
    Albanese, M.D., 1983, Bedrock geologic map of the Livengood B-4 Quadrangle, east-central Alaska: Report of Investigations RI 83-3, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:40,000
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 40000
    Source_Contribution:
    This map contains geologic unit descriptions and outcrop locations and was used to plan traverses and help define geologic units.

    Allegro, 1984 (source 2 of 44)
    Allegro, G.L., 1984, Geology of the Old Smoky Prospect, Livengood C-4 Quadrangle: Report of Investigations RI 84-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 10 p., 1 sheet, scale 1:120
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 120
    Source_Contribution:
    This report contains detailed information about the Old Smoky prospect that was used to help define unit descriptions and understand alteration textures seen in the area.

    Athey and others, 2004a (source 3 of 44)
    Athey, J.E., Layer, P.W., and Drake, Jeff, 2004, 40Ar/39Ar ages of rocks collected in the Livengood C-3, C-4, and B-5 quadrangles, Alaska: Raw-Data File RDF 2004-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 12 p.
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains 40Ar/39Ar age data that was used to constrain the timing of igneous activity and sericite-bearing gold-arsenopyrite alteration from the Old Smoky prospect. This report contains the raw analytical data for 40Ar/39Ar laser step-heating conducted at the University of Alaska Fairbanks Geochronology Lab in Fairbanks, Alaska. The locations for these data are plotted on the geologic maps, and their interpreted ages are cited in the booklet PIR 2004-3, which contains unit descriptions for reports PIR 2004-3a and PIR 2004-3b.

    Athey and others, 2004b (source 4 of 44)
    Athey, J.E., Werdon, M.B., Szumigala, D.J., Newberry, R.J., Hicks, S.A., and Erickson, H.A., 2004, Major-oxide, minor-oxide, and trace-element geochemical data from rocks collected in the Livengood Quadrangle, Alaska, in 2001 and 2003: Raw-Data File RDF 2004-2, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 63360
    Source_Contribution:
    The major-oxide, minor-oxide, and trace-element data contained in this report were used to assign root names and trace-element-indicated tectonic settings to igneous and weakly metamorphosed igneous rocks. These data were used to define map unit boundaries and were incorporated into unit descriptions for PIR 2004-3a and PIR 2004-3b, which are contained in booklet PIR 2004-3.

    Blodgett, 1992 (source 5 of 44)
    Blodgett, R.B., 1992, Taxonomy and paleobiogeographic affinities of an early Middle Devonian (Eifelian) gastropod faunule from the Livengood Quadrangle, east-central Alaska: Palaeontographica Abteilung A, Stuttgart, Germany.

    Other_Citation_Details: Palaeontographica Abteilung A, v. 221, p. 125-168
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains fossil data that provide age constraint for the Cascaden Ridge sedimentary unit (Dc).

    Brosgé and others, 1969 (source 6 of 44)
    Brosgé, W.P., Lanphere, M.A., Reiser, J.N., and Chapman, R.M., 1969, Probable Permian age of the Rampart Group, central Alaska: Bulletin B 1294-B, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 18 p.
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains descriptions and age data for the Rampart volcanic rocks and constrains the age of unit Trg.

    Bundtzen, 1983 (source 7 of 44)
    Bundtzen, T.K., 1983, Bedrock geologic outcrop map of the Livengood B-3 Quadrangle: Report of Investigations RI 83-6, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:40,000
    Type_of_Source_Media: Map
    Source_Scale_Denominator: 40000
    Source_Contribution:
    This map contains geologic unit descriptions and outcrop locations and was used to plan traverses and help define geologic units.

    Chapman and others, 1980 (source 8 of 44)
    Chapman, R.M., Weber, F.R., Michael Churkin, Jr., and Carter, Claire, 1980, The Livengood Dome Chert, a new Ordovician formation in central Alaska and its relevance to displacement on the Tintina Fault: Professional Paper P 1226-F, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: p. F1-F13
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains information about Livengood Dome Chert unit Old, Lost Creek units Ss and Sl, and Amy Creek units lPzZmc, lPzZd, and lPzZmb.

    DGGS and others, 1999 (source 9 of 44)
    DGGS, Staff, Geoterrex-Dighem, Staff, and Stevens Exploration Inc., Staff, 1999, CD-ROM containing profile and gridded data and section lines of 1998 geophysical survey data for part of the Livengood mining district, Alaska, central Livengood Quadrangle: Public-Data File PDF 99-19, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 CD-ROM
    Type_of_Source_Media: Tabular digital data, raster digital data, vector digital data
    Source_Contribution:
    The geophysical datasets in this publication were used throughout the Livengood mapping project. Prior to field work, the geophysical data were used to identify locations of geophysically inferred faults and potential unit boundary locations, and unusual anomalies were noted for follow-up investigation in the field. Printed copies of the geophysical data, overlain by topography, were carried by geologists in the field to help determine the geologic cause for variations in the geophysical data along their traverses. During map compilation, geophysical data were useful for extending mapped contacts through regions covered by vegetation or surficial deposits.

    Foster, 1966 (source 10 of 44)
    Foster, R.L., 1966, The petrology and structure of the Amy Dome area, Tolovana mining district, east-central Alaska: University of Missouri-Rolla, Rolla, MO, USA.

    Other_Citation_Details: Ph.D. dissertation, 225 p., 1:7,200
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 7200
    Source_Contribution:
    This report contains detailed information about the Cambrian ophiolite assemblage and other surrounding units and was used to help define bedrock units in the map area.

    Freeman, 2003 (source 11 of 44)
    Freeman, C.J., 2003, Executive summary, Livengood project, Alaska: Avalon Development Corporation, Fairbanks, AK, USA, not published.

    Other_Citation_Details:
    14 p., includes geologic maps interpreted from Cambior Inc. exploration in 1999
    Type_of_Source_Media: Report, figures
    Source_Contribution:
    This report contains a summary of mineral industry work in Livengood and some geologic interpretation.

    Hanneman, 1998 (source 12 of 44)
    Hanneman, Karl, 1998, Summary report, Livengood Gold project, Interior Alaska: Alaska Placer Development, Inc., Not published.

    Other_Citation_Details: 14 p. (refers to soil grid conducted by E. Twelker, 1981-1984)
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a summary of mineral industry work in the Livengood area and mentions the soil grid conducted by Eric Twelker from 1981 to 1984. The soil grid was used in this study to help interpret the bedrock geology in areas not traversed by DGGS personnel.

    Hite, 1977 (source 13 of 44)
    Hite, J.B., 1977, Summary report on the Money Knob project, Livengood, Alaska: Homestake Mining Company, Not published.

    Other_Citation_Details: 5 p., 1 sheet, scale 1:4,800
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 4800
    Source_Contribution:
    This report contains a geologic map that was used to supplement geologic mapping by DGGS personnel and locate unmapped felsic dikes.

    Irvine and Baragar, 1971 (source 14 of 44)
    Irvine, T.N., and Baragar, W.R.A., 1971, A guide to the chemical classification of the common volcanic rocks: Canadian Journal of Earth Sciences (National Research Council of Canada), Ottawa, ON, Canada.

    Other_Citation_Details: Canadian Journal of Earth Sciences, v. 8, p. 523-548.
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains methodology for calculating CIPW normative compositions and was used to determine the compositions of igneous rocks.

    Joesting, 1941 (source 15 of 44)
    Joesting, H.R., 1941, The Hudson Cinnabar prospect (Olive Creek), Tolovana district, Alaska: Prospect Evaluation PE 49-6, Alaska Territorial Department of Mines, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 6 p., 1 sheet, scale 1:240
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 240
    Source_Contribution:
    This report contains a description of the cinnabar mineralization at the prospect on Olive Creek.

    Lister and Snoke, 1984 (source 16 of 44)
    Lister, G.S., and Snoke, A.W., 1984, S-C mylonites: Elsevier Ltd., Amsterdam.

    Other_Citation_Details: Journal of Structural Geology, v. 6, p. 617-638
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a description of S-C fabric in rocks experiencing shear and re-alignment of minerals.

    Mertie, 1917 (source 17 of 44)
    J.B. Mertie, Jr., 1917, The gold placers of the Tolovana district: Bulletin B 662-D, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: p. 221-277
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains descriptions of geomorphology, mineralization, and geology in the Livengood area. Mertie discusses a hypothetical drainage reversal of Livengood Creek based on the geomorphologic features of the creek.

    Newberry and Haug, 1997 (source 18 of 44)
    Newberry, R.J., and Haug, S.A., 1997, CIPW norm, trace element, and Sr isotopic data for igneous rocks of the Tanana B-1 Quadrangle and vicinity: Public-Data File PDF 97-29I, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 16 p.
    Type_of_Source_Media: Report, tabular data
    Source_Contribution:
    This report contains trace-element data, which indicate a within-plate signature for the Rampart volcanic rocks (unit Trg) and suggest that the Rampart volcanic rocks may represent back-arc rifting in a marine environment.

    Reifenstuhl and others, 1998 (source 19 of 44)
    Reifenstuhl, R.R., Dover, J.H., Newberry, R.J., Clautice, K.H., Liss, S.A., Blodgett, R.B., and Weber, F.R., 1998, Interpretive geologic bedrock map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public-Data File PDF 98-37B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 17 p., 1 sheet, scale 1:63,360
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 63360
    Source_Contribution:
    This report contains descriptions of bedrock units that extend westward from the Livengood area, or that correlate with units in the Livengood area. The report also describes gold occurrences that may be genetically similar to lode gold prospects in the Livengood area.

    Reifenstuhl and others, 1997 (source 20 of 44)
    Reifenstuhl, R.R., Dover, J.H., Pinney, D.S., Newberry, R.J., Clautice, K.H., Liss, S.A., Blodgett, R.B., Bundtzen, T.K., and Weber, F.R., 1997, Geologic map of the Tanana B-1 Quadrangle, central Alaska: Report of Investigations RI 97-15A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 17 p., 1 sheet, scale 1:63,360
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 63360
    Source_Contribution:
    This report contains descriptions of bedrock units that extend westward from the Livengood area, or that correlate with units in the Livengood area. The report also describes gold occurrences that may be genetically similar to lode gold prospects in the Livengood area.

    Rinehart and others, 1997 (source 21 of 44)
    Rinehart, C.D., Light, T.D., and Shew, N.B., 1997, Petrography and radiometric ages for selected rocks from the Livengood Quadrangle, Alaska: Open-File Report OF 97-484-D, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 22 p.
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains age data for igneous units that may be genetically similar to igneous rocks in the map area.

    Robinson, 1983 (source 22 of 44)
    Robinson, M.S., 1983, Bedrock geologic map of the Livengood C-4 Quadrangle, east-central Alaska: Report of Investigations RI 83-4, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:40,000
    Type_of_Source_Media: Map
    Source_Scale_Denominator: 40000
    Source_Contribution:
    This map contains geologic unit descriptions and outcrop locations and was used to plan traverses and help define geologic units.

    Saunders, 1955 (source 23 of 44)
    Saunders, R.H., 1955, Report on the Griffin Nickel prospect, Livengood Quadrangle: Prospect Evaluation PE 49-13, Alaska Territorial Department of Mines, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 8 p.
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a description of variably mineralized quartz-carbonate-altered serpentinite.

    Smith, 1983 (source 24 of 44)
    Smith, T.E., 1983, Bedrock geologic map of the Livengood C-3 Quadrangle, east-central Alaska: Report of Investigations RI 83-5, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:40,000
    Type_of_Source_Media: Map
    Source_Scale_Denominator: 40000
    Source_Contribution:
    This map contains geologic unit descriptions and outcrop locations and was used to plan traverses and help define geologic units.

    Weber and others, 1994 (source 25 of 44)
    Weber, F.R., Blodgett, R.B., Harris, A.G., and J.T. Dutro, Jr., 1994, Paleontology of the Livengood Quadrangle, Alaska: Open-File Report OF 94-215, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 24 p., 1 sheet, scale 1:250,000
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 250000
    Source_Contribution:
    This report contains fossil data that provide age constraint for several of the sedimentary units in the map area.

    Weber and others, 1985 (source 26 of 44)
    Weber, F.R., Smith, T.E., Hall, M.H., and Forbes, R.B., 1985, Geologic guide to the Fairbanks-Livengood area, east-central Alaska, AAPG, SEPM, and SEG Meeting, Anchorage, Alaska, 1985: Alaska Geological Society, Anchorage, AK, USA.

    Other_Citation_Details: 44 p.
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains descriptions of geologic units that were incorporated into the unit descriptions.

    Weber and others, 1992 (source 27 of 44)
    Weber, F.R., Wheeler, K.L., Rinehart, C.D., Chapman, R.M., and Blodgett, R.B., 1992, Geologic map of the Livengood Quadrangle, Alaska: Open-File Report OF 92-562, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 20 p., 1 sheet, scale 1:250,000
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 250000
    Source_Contribution:
    This report and map contain detailed unit descriptions and geologic information that directly apply to this study. This publication was used to help define geologic units and unit boundaries in the map area.

    Wheeler and Weber, 1988 (source 28 of 44)
    Wheeler, K.L., and Weber, F.R., 1988, Bibliography of selected references on the geology of the Livengood Quadrangle, east-central Alaska: Open-File Report OF 88-203, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 79 p.
    Type_of_Source_Media: Report
    Source_Contribution:
    This compilation of references contains an introduction that identifies the Victoria Creek Fault as a strand of the Tintina Fault system.

    Wilson and others, 1998 (source 29 of 44)
    Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (Interior) Alaska: Open-File Report OF 98-133, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 76 p., 3 sheets, scale 1:500,000
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 500000
    Source_Contribution:
    This report contains detailed unit descriptions that were used to help define the geologic units in the map area.

    Blodgett and others, 1988 (source 30 of 44)
    Blodgett, R.B., Zhang, Ning, Ormiston, A.R., and Weber, F.R., 1988, A Late Silurian age determination for the limestone of the "Lost Creek Unit," Livengood C-4 Quadrangle, east-central Alaska:.

    This is part of the following larger work.

    T.D. Hamilton, ed., and J.P. Galloway, ed., 1988, Geological Studies in Alaska by the U.S. Geological Survey during 1987: Circular C 1016, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: p. 54-56
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains fossil data and a description of the Lost Creek units (Ss and Sl).

    Clough and Goldhammer, 2000 (source 31 of 44)
    Clough, J.G., and Goldhammer, R.K., 2000, Evolution of the neoproterozoic Katakturuk Dolomite ramp complex, northeastern Brooks Range, Alaska:.

    This is part of the following larger work.

    J.P. Grotzinger, ed., and N.P. James, ed., 2000, Carbonate Sedimentation and Diagenesis in the Evolving Precambrian World: SEPM Special Publication, Tulsa, Oklahoma.

    Other_Citation_Details: SEPM Special Publication, no. 67, p. 209-241
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a detailed description of the Katakturuk Dolomite, which may be facies equivalent to the Amy Creek assemblage.

    Gergen and others, 1988 (source 32 of 44)
    Gergen, L.D., Decker, J.E., and Plafker, George, 1988, A comparative petrologic study of sandstone from the Wilber Creek, Cascaden Ridge, and Wickersham units in the Livengood Quadrangle:.

    This is part of the following larger work.

    J.P. Galloway, ed., and T.D. Hamilton, ed., 1988, Geological Studies in Alaska by the U.S. Geological Survey during 1987: Circular C 1016, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: p. 57-60
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a discussion of depositional environments for the Wilber Creek, Cascaden Ridge, and Wickersham units based on clast composition, characteristics, and modal analysis.

    Péwé, 1975 (source 33 of 44)
    Péwé, T.L., 1975, Quaternary geology of Alaska: Professional Paper P 835, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 145 p.
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a description of the Pleistocene fauna uncovered in Lillian Creek.

    Karl and others, 1988 (source 34 of 44)
    Karl, S.M., Ager, T.A., Hanneman, Karl, and Teller, S.D., 1988, Tertiary gold-bearing gravel at Livengood, Alaska:.

    This is part of the following larger work.

    J.P. Galloway, ed., and T.D. Hamilton, ed., 1988, Geological Studies in Alaska by the U.S. Geological Survey during 1987: Circular C 1016, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: p. 61-63
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a description of unconsolidated sedimentation in Livengood valley and a Tertiary pollen age from Livengood Bench.

    Loney and Himmelberg, 1988 (source 35 of 44)
    Loney, R.A., and Himmelberg, G.R., 1988, Ultramafic rocks of the Livengood Terrane:.

    This is part of the following larger work.

    J.P. Galloway, ed., and T.D. Hamilton, ed., 1988, Geologic studies in Alaska by the U.S. Geological Survey during 1987: Circular Circ. 1016, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: p. 68-70
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a description of the ophiolite assemblage and addresses the nature of the contact between the mafic and ultramafic rocks and the Cascaden Ridge sedimentary rock unit (Dc).

    Moore, 1987 (source 36 of 44)
    Moore, T.E., 1987, Geochemistry and tectonic setting of some volcanic rocks of the Franklinian assemblage, central and eastern Brooks Range:.

    This is part of the following larger work.

    Irv Tailleur, ed., and Paul Weimer, ed., 1987, Alaskan North Slope Geology, Volume II: SEPM, Pacific Section, California and Alaska Geological Society, Fullerton, California.

    Other_Citation_Details: p. 691-710
    Type_of_Source_Media: Report
    Source_Contribution:
    This report contains a trace-element-indicated tectonic setting of within-plate for the volcanic rocks associated with the Katakturuk Dolomite. The volcanic rocks and Katakturuk Dolomite may be equivalent to the Amy Creek assemblage in the map area.

    Weber and others, 1988 (source 37 of 44)
    Weber, F.R., Wheeler, K.L., Dover, J.H., Rinehart, C.D., Blodgett, R.B., Cady, J.W., Karl, S.M., McCammon, R.B., and Miyaoka, R., 1988, Geologic framework:.

    This is part of the following larger work.

    Weber, F.R. , ed., McCammon, R.B., ed., Rinehart, C.D. , ed., Light, T.D., ed., and Wheeler, K.L. , ed., 1988, Geology and mineral resources of the White Mountains National Recreation Area, east-central Alaska: Open-File Report OF 88-284, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: p. 4-58
    Type_of_Source_Media: Report, map
    Source_Contribution:
    This report contains detailed unit descriptions of geologic units in the southern Livengood Quadrangle that may correlate with geologic units in the map area.

    DGGS, 1973 (source 38 of 44)
    Division of Geological & Geophysical Surveys, 1973, Unpublished miscellaneous geologic mapping of trenches and streams in the Livengood area.

    Other_Citation_Details:
    Unpublished information, thought to be authored by Eakins, G.R. and Foster, R.L.
    Type_of_Source_Media: Atlas
    Source_Contribution:
    This collection of maps contains unpublished trench and stream mapping that was incorporated into this study. Eakins's name appears on some of the work and he is assumed to be an author. Written correspondence from 1973 indicates that Eakins invited Foster to work on the project, and that Foster agreed to take part in the field work. It is unknown if Foster did contribute to this mapping. Other unknown persons may also have contributed to the mapping effort.

    Freeman and others, 1997 (source 39 of 44)
    Freeman, C.J., Kulash, William, Wolf, Ken, McCoy, Dan, and Wietchy, D.M., 1997, Summary report for the Tolovana Gold project, Livengood-Tolovana mining district, Alaska.

    Other_Citation_Details: Unpublished report for Placer Dome U.S. Inc.
    Type_of_Source_Media: Report, tabular data
    Source_Contribution:
    This report contains a summary history of industry exploration in the Livengood area and geologic information. Bedrock unit information determined from drill hole samples in the Livengood valley was incorporated into this study.

    Minehane and Rogers, 1997 (source 40 of 44)
    Minehane, D.L., and Rogers, J.A., 1997, 1997 Tolovana project report, Livengood, central-Interior Alaska.

    Other_Citation_Details: Placer Dome Exploration, unpublished report
    Type_of_Source_Media: Report, map
    Source_Scale_Denominator: 10000
    Source_Contribution:
    This report contains geologic information, project information such as drill hole locations, and associated samples of drill core that was incorporated into this study.

    Morrison, 1990 (source 41 of 44)
    Morrison, P.R., 1990, Plate V. Geologic cross-section A-A', in Money Knob summary report.

    Other_Citation_Details: Amax Gold Inc., unpublished report
    Type_of_Source_Media: Map
    Source_Scale_Denominator: 240
    Source_Contribution:
    This map contains a cross section of two drill holes collared near the junction of Lillian Creek and the old Elliott Highway.

    UAF geologic field camp, 2001 (source 42 of 44)
    University of Alaska Fairbanks geologic field camp, 2001, Unpublished data from University of Alaska-Fairbanks field camp.

    Other_Citation_Details:
    Unpublished field map created by the University of Alaska Fairbanks field camp, 2001, 1 sheet, scale 1:100,000
    Type_of_Source_Media: Map
    Source_Scale_Denominator: 100000
    Source_Contribution:
    This map shows geologic contacts and generalized units and was used as a general geologic guide to the area.

    U.S. Geological Survey, Digital Raster Graphic (DRG), Livengood C-3 (source 43 of 44)
    USGS, 1997, Digital Raster Graphic (DRG), Livengood C-3: USGS, Reston, VA, USA.

    Online Links:

    Type_of_Source_Media: online
    Source_Scale_Denominator: 63360
    Source_Contribution:
    This topography was used in the publication as a base for the sample location points. This topography appears as a transparent overlay on the printed geologic maps.

    U.S. Geological Survey, Digital Raster Graphic (DRG), Livengood C-4 (source 44 of 44)
    USGS, 1997, Digital Raster Graphic (DRG), Livengood C-4: USGS, Reston, VA, USA.

    Online Links:

    Type_of_Source_Media: online
    Source_Scale_Denominator: 63360
    Source_Contribution:
    This topography was used in the publication as a base for the sample location points. This topography appears as a transparent overlay on the printed geologic maps.

  2. How were the data generated, processed, and modified?

    Date: 2003 (process 1 of 3)
    Field work - During the summer of 2003 DGGS conducted a geologic field mapping project to provide geologic ground truth for airborne geophysical surveys flown in the Livengood area in 1999 (DGGS and others, 1999). DGGS efforts are focused on determining the geologic framework of the Livengood area, and its potential for placer gold and lode mineral deposits. Field work for bedrock investigations, including ridge traverses and examination of riverbank exposures, was conducted for approximately 90 person-days during the months of May through August 2003 and 5 person-days in July 2001. Field notes and rock samples were collected at approximately 1,100 stations throughout the Livengood Quadrangle. Plots of airborne magnetic and resistivity data (DGGS and others, 1999) overlain with standard USGS raster topography were used daily in the field to help identify geologic contacts, units, and faults. At most field stations, magnetic susceptibility data were collected to help identify magnetic units. Bedrock mappers recorded observations on 1:50,000-scale topographic base maps of 15-minute quadrangles that were enlarged from a scale of 1:63,360. In the evenings, each geologist's observations were compiled onto a single mylar base map. Field stations were located using handheld Garmin 12XL GPS units. Field station notes and downloaded GPS location data were entered into a Microsoft Access 2000 database. Geologic information from relevant literature, mineral industry, and historical accounts was incorporated into the data generated from field work.

    Data sources used in this process:

    • Albanese, 1983
    • Allegro, 1984
    • Blodgett, 1992
    • Brosgé and others, 1969
    • Bundtzen, 1983
    • Chapman and others, 1980
    • DGGS and others, 1999
    • Foster, 1966
    • Freeman, 2003
    • Hanneman, 1998
    • Hite, 1977
    • Joesting, 1941
    • Lister and Snoke, 1984
    • Mertie, 1917
    • Newberry and Haug, 1997
    • Reifenstuhl and others, 1998
    • Reifenstuhl and others, 1997
    • Robinson, 1983
    • Saunders, 1955
    • Smith, 1983
    • Weber and others, 1994
    • Weber and others, 1985
    • Weber and others, 1992
    • Wheeler and Weber, 1988
    • Wilson and others, 1998
    • Blodgett and others, 1988
    • Clough and Goldhammer, 2000
    • Gergen and others, 1988
    • Karl and others, 1988
    • Péwé, 1975
    • Loney and Himmelberg, 1988
    • Moore, 1987
    • Weber and others, 1988
    • DGGS, 1973
    • Freeman and others, 1997
    • Minehane and Rogers, 1997
    • Morrison, 1990
    • UAF geologic field camp, 2001
    • U.S. Geological Survey, Digital Raster Graphic (DRG), Livengood C-3
    • U.S. Geological Survey, Digital Raster Graphic (DRG), Livengood C-4

    Date: 2004 (process 2 of 3)
    Laboratory data - During this project, 50 rock samples were collected for whole rock (major- and minor-oxides, and petrogenetically important trace-elements) analysis and 54 rock samples were collected for geochemical trace-element analysis (Athey and others, 2004b). Analytical data were used to aid interpretation and development of the geologic map and evaluation of the area's mineral potential. To further geologic understanding of the area, igneous and metamorphic rock samples were selected for whole-rock geochemical analysis. Results from major-oxide and trace-element geochemistry of igneous and metamorphic rocks were used to classify rocks according to established petrologic nomenclature. To help evaluate the area's mineral resource potential, rocks that were either visibly mineralized, or had features that suggested the potential to be mineralized, were analyzed for geochemical trace elements. Unweathered or minimally weathered rock samples were preferentially selected for analysis. Details about the analyses are found in the source publications. Petrography and modal analyses on more than 154 thin sections, and modal analysis of approximately 57 rock slabs stained for potassium feldspar, were also used to classify rocks according to established petrologic nomenclature. Geochronologic information was obtained by the 40Ar/39Ar and K-Ar methods in order to determine the age of geologic units in the map area as well as the age of sericite alteration spatially associated with gold-bearing, arsenopyrite-altered intrusive rock at the Old Smoky prospect in the Livengood C-4 Quadrangle (Athey and others, 2004a). See text and "Source_Information" section for further details about the analyses. One Sm-Nd analysis is in process. Microfossil and megafossil information was obtained by the study of hand samples, thin sections, slabs, and residue from dissolved carbonate.

    Data sources used in this process:

    • Athey and others, 2004a
    • Athey and others, 2004b
    • Irvine and Baragar, 1971
    • Rinehart and others, 1997

    Date: 2004 (process 3 of 3)
    Digital Cartography - The final compilation of the bedrock geologic map data on mylar was scanned as a high-resolution tiff file. The files were imported into MapInfo Professional 7.5, and geographically registered in UTM coordinates (see spatial reference information section below). Geologic polygons were digitized 'on-screen' by tracing geologic contacts; each polygon was attributed with appropriate supporting information. The geologic polygon and line layers were imported into ArcGIS 8.3 geodatabase format using ArcTools and ArcCatalog 8.3. Spatially registered point data for the map were made in MapInfo Professional 6.5 and 7.5 from Microsoft Excel and Access 2000 files and converted into ArcGIS 8.3 geodatabase format using ArcTools and ArcCatalog 8.3. Editing and quality control checks took place at every process step. Final geologic feature and attribute editing was completed in ArcGIS 8.3. Map text was created in Microsoft Word. All final map layout and editing was accomplished in CorelDRAW 10.0.

    Data sources used in this process:

    • U.S. Geological Survey, Digital Raster Graphic (DRG), Livengood C-3
    • U.S. Geological Survey, Digital Raster Graphic (DRG), Livengood C-4

  3. What similar or related data should the user be aware of?

    Athey, Jennifer E., Werdon, Melanie B., Newberry, Rainer J., Szumigala, David J., Craw, Patty A., and Hicks, Shelley A., 2004, Geologic map of the Livengood SW C-3 and SE C-4 quadrangles, Tolovana mining district, Alaska: Preliminary Interpretive Report PIR 2004-3a, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 map sheet, scale 1:50,000
    Athey, Jennifer E., and Craw, Patty A., 2004, Geologic maps of the Livengood SW C-3 and SE C-4 quadrangles, Tolovana mining district, Alaska: Preliminary Interpretive Report PIR 2004-3, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: Text report, 24 p. Accompanies PIR 2004-3A, PIR 2004-3B
    DGGS, Staff, Geoterrex-Dighem, Staff, and Stevens Exploration Inc., Staff, 1999, CD-ROM containing profile and gridded data and section lines of 1998 geophysical survey data for part of the Livengood mining district, Alaska, central Livengood Quadrangle: Public-Data File PDF 99-19, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 CD-ROM
    Athey, J.E., Layer, P.W., and Drake, Jeff, 2004, 40Ar/39Ar ages of rocks collected in the Livengood C-3, C-4, and B-5 quadrangles, Alaska: Raw-Data File RDF 2004-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 12 p.
    Athey, J.E., Werdon, M.B., Szumigala, D.J., Newberry, R.J., Hicks, S.A., and Erickson, H.A., 2004, Major-oxide, minor-oxide, and trace-element geochemical data from rocks collected in the Livengood Quadrangle, Alaska, in 2001 and 2003: Raw-Data File RDF 2004-2, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Newberry, R.J., and Athey, J.E., Unknown, Microprobe-based compositions of placer and lode gold in the Livengood area, Tolovana mining district, Alaska: Raw-Data File in prep., State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Bundtzen, T.K., Eakins, G.R., and Conwell, C.N., 1982, Review of Alaska mineral resources 1981: Annual Report AR 1981, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 48 p., 2 sheets, scale 1:42,240
    Cathrall, J.B., Antweiler, J.C., and Mosier, E.L., 1987, Occurrence of platinum in gold samples from the Tolovana and Rampart districts, Livengood Quadrangle, Alaska: Open-File Report OFR 87-330, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 7 p.
    Freeman, C.J., and Schaefer, J.R.G., 1999, Alaska resource data file, Livengood Quadrangle: Open-File Report OFR 99-574, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 464 p.
    Glover, A.E., 1950, Placer gold fineness: Miscellaneous Report MR 195-1, Alaska Territorial Department of Mines, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 38 p.
    Newberry, R.J., and Clautice, K.H., 1997, Compositions of placer gold in the Rampart-Eureka-Manley-Tofty area, eastern Tanana and western Livengood Quadrangles, central Interior Alaska, determined by electron microprobe analysis: Public-Data File PDF 97-49, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 49 p.
    Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, Donald, Robinson, M.S., Smith, T.E., and Yeend, Warren, 1987, Significant metalliferous lode deposits and placer districts of Alaska: Bulletin B 1786, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 104 p., 2 plates, scale 1:5,000,000
    Péwé, T.L., Wahrhaftig, Clyde, and Weber, F.R., 1966, Geologic map of the Fairbanks Quadrangle, Alaska: Miscellaneous Geological Investigations Map Map I-455, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 5 p., 1 sheet, scale 1:250,000
    Reger, R.D., 1987, Preliminary photointerpretive maps of the geology, geologic-materials, permafrost, and wetlands-classification, Fairbanks C-5 Quadrangle, Alaska: Public-Data File PDF 87-19, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 4 sheets, scale 1:31,680
    Smith, P.S., 1941, Mineral industry of Alaska - 1940: Bulletin Bull. 926, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 37 p.
    Szumigala, D.J., Swainbank, R.C., Henning, M.W., and Pillifant, F.M., 2003, Alaska's Mineral Industry 2002: Special Report SR 57, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 63 p.
    Weber, F.R., Wheeler, K.L., Rinehart, C.D., Chapman, R.M., and Blodgett, R.B., 1992, Geologic map of the Livengood Quadrangle, Alaska: Open-File Report OFR 92-562, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: 20 p., 1 sheet, scale 1:250,000
    Barnes, D.F., 1961, Gravity low at Minto Flats, Alaska:.

    This is part of the following larger work.

    Unknown, ed.,, 1961, Short Papers in the Geologic and Hydrologic Sciences, Articles 293-435: Professional Paper P 424-D, U.S. Geological Survey, Washington, DC, USA.

    Online Links:

    Other_Citation_Details: p. D 254-257


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Location data for geologic point shape files were downloaded from Garmin 12XL GPS units into a Microsoft Access database. Field notes were manually entered into the database. Spatial data attributes were either queried directly from the database or attached to the objects using MapInfo Professional 6.5 or 7.5, and ArcGIS 8.3. Attributes were verified for consistency and completeness during the creation of the metadata. Geologic data used in the compilation are the field maps and notes from this project (2001 and 2003) as well as data from other sources as noted in the "Source_Information" section. The attributes of this geospatial data set consist of text identifiers and numeric codes that indicate the identity of the geologic unit or type of geologic feature and determine how each feature is symbolized. To check attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog or digital compilation were corrected as needed. The geologic interpretations presented in this report have undergone two technical reviews by geologists familiar with the subject of the report or geology of the map area. Reviewers' suggestions were incorporated into the final draft when deemed appropriate by the author.

  2. How accurate are the geographic locations?

    DGGS location data and estimated position errors were downloaded from Garmin 12XL GPS units into an Access database. Sample numbers and locations with selected data were queried from the database or brought into an Excel spreadsheet and then spatially registered and analyzed in MapInfo Professional 6.5 or 7.5. See "Source_Information" section for horizontal positional accuracy of locations not measured by DGGS.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    This dataset includes feature classes that contain information about geologic units; age, fossil, and field sample locations; structural features; structural measurements; dike locations; and drill hole locations.

  5. How consistent are the relationships among the observations, including topology?

    Topology is present on appropriate polygon and line feature classes of the originating geodatabase; others are point feature classes.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hardcopies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.

  1. Who distributes the data set? (Distributor 1 of 1)

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    907-451-5020 (voice)
    907-451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our web site (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media over the counter by mail, phone, fax, or email from the DGGS Fairbanks office. Turn around time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for a exact shipping ammount.


Who wrote the metadata?

Dates:
Last modified: 04-Oct-2010
Metadata author:
Metadata manager
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Fairbanks, AK 99709-3707
USA

907-451-5020 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.6 on Thu Mar 24 16:06:49 2011