Major-oxide, minor-oxide, and trace-element geochemical data from rocks and stream sediments collected in the northern Fairbanks mining district, Circle quadrangle, Alaska in 2007

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What does this data set describe?

Title:
Major-oxide, minor-oxide, and trace-element geochemical data from rocks and stream sediments collected in the northern Fairbanks mining district, Circle quadrangle, Alaska in 2007
Abstract:
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys carried out a geological field survey, including mapping and sampling northeast of Fairbanks in the Circle A-4, A-5, B-4, and B-5 quadrangles, Alaska from May 31 to June 28, 2007. The fieldwork provides basic information critical to building an understanding of Alaska geology and is part of an integrated program of airborne geophysical surveys followed by geological mapping. During 2007, 128 rock samples were collected for geochemical trace-element analysis, and 44 rock samples were collected for whole rock (major- and minor-oxide) analysis. Petrogenetically important trace-elements will be analyzed in a subsequent study to be published with the final map and report for this area. In addition, 67 stream sediment samples were collected for geochemical trace-element analysis. The stream sediment geochemical study was conducted over the proposed Mount Ryan Remote Recreational Cabin Staking Area as considered by Alaska's Division of Mining, Land & Water in 2007.
Supplemental_Information:
The data are available in tabular format as comma delimited ascii files organized into three layers each comprised of three tables as described in this metadata file under the "Entity_and_Attribute_Information" section. The layers are as follows:
Trace-metal rock geochemistry     sample locations and descriptions, geochemical data, analytical methods and detection limits (Tables 1, 2, 7)
Whole-rock major- and minor-oxide geochemistry     sample locations and descriptions, geochemical data, analytical methods and detection limits (Tables 3, 4, 8)
Trace-element stream sediment geochemistry     sample locations, geochemical data, analytical methods and detection limits (Tables 5, 6, 9)
  1. How should this data set be cited?

    Athey, J.E., Freeman, L.K., Werdon, M.B., Szumigala, D.J., Lessard, R.L., Newberry, R.J., Hansen, S.E., and Jing, Liping, 2008, Major-oxide, minor-oxide, and trace-element geochemical data from rocks and stream sediments collected in the northern Fairbanks mining district, Circle quadrangle, Alaska in 2007: Raw Data File RDF 2008-1 v. 1.0.1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 41 pp.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -146.4743
    East_Bounding_Coordinate: -145.982
    North_Bounding_Coordinate: 65.409
    South_Bounding_Coordinate: 65.2103

  3. What does it look like?

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

    Beginning_Date: May-2007
    Ending_Date: Jun-2007
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: tabular digital data, report

  6. How does the data set represent geographic features?

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

      This is a Point 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 1
      Ordinates (y-coordinates) are specified to the nearest 1
      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 6378137.
      The flattening of the ellipsoid used is 1/298.25722210088.

  7. How does the data set describe geographic features?

    Table1.csv
    Location and description of rock samples collected for trace-element geochemical analyses in the northern Fairbanks mining district, Circle quadrangle, Alaska (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample Number
    Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

    Generic example of unique sample identifier: 20YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials represent the following: 'JEA' = Jen Athey; 'MBW' = Melanie Werdon; 'RN' = Rainer Newberry; 'LF' = Larry Freeman; 'Z' = David Szumigala; "SEH" = Sharon Hansen; "RL" = Richard Lessard.

    Latitude
    Latitude (Source: Alaska Division of Geological & Geophysical Surveys)

    Latitude in degrees for UTM Zone 3, NAD 27

    Longitude
    Longitude (Source: Alaska Division of Geological & Geophysical Surveys)

    Longitude in degrees for UTM Zone 3, NAD 27

    UTM E
    Easting (Source: Alaska Division of Geological & Geophysical Surveys)

    Easting for UTM Zone 6, NAD 27

    UTM N
    Northing (Source: Alaska Division of Geological & Geophysical Surveys)

    Northing for UTM Zone 6, NAD 27

    Zone
    UTM Zone (Source: Alaska Division of Geological & Geophysical Surveys)

    06W is UTM zone for all samples in this data set

    Description
    Brief rock description (Source: Alaska Division of Geological & Geophysical Surveys)

    Brief rock description

    Table2.csv
    Trace-element geochemical analyses for rocks collected in the Solomon Quadrangle, Seward Peninsula, Alaska. Elements that were not analyzed for a particular sample are denoted by '-'. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Sample Number
    Unique sequential sample identifier (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Generic example of unique sample identifier: 20YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials represent the following: 'JEA' = Jen Athey; 'MBW' = Melanie Werdon; 'RN' = Rainer Newberry; 'LF' = Larry Freeman; 'Z' = David Szumigala; "SEH" = Sharon Hansen; "RL" = Richard Lessard.

    Au
    Gold values acquired by analysis with inductive coupled plasma-atomic emission spectroscopy following a 30g fire assay fusion (FA-ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.001
    Maximum:10
    Units:ppm

    Ag
    Silver values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.5
    Maximum:100
    Units:ppm

    Al
    Aluminum values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:50
    Units:%

    As
    Arsenic values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:5
    Maximum:10000
    Units:ppm

    Ba
    Barium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:10
    Maximum:10000
    Units:ppm

    Be
    Beryllium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.5
    Maximum:1000
    Units:ppm

    Bi
    Bismuth values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:2
    Maximum:10000
    Units:ppm

    Ca
    Calcium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:50
    Units:%

    Cd
    Cadmium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.5
    Maximum:1000
    Units:ppm

    Co
    Cobalt values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Cr
    Chromium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Cu
    Copper values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Fe
    Iron values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:50
    Units:%

    Ga
    Gallium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:10
    Maximum:10000
    Units:ppm

    K
    Potassium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:10
    Units:%

    La
    Lanthanum values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:10
    Maximum:1000
    Units:ppm

    Mg
    Magnesium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:50
    Units:%

    Mn
    Manganese values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:5
    Maximum:100000
    Units:ppm

    Mo
    Molybdenum values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Na
    Sodium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:10
    Units:ppm

    Ni
    Nickel values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    P
    Phosphorus values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:10
    Maximum:10000
    Units:ppm

    Pb
    Lead values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:2
    Maximum:10000
    Units:ppm

    S
    Sulfur values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:10
    Units:%

    Sb
    Antimony values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:5
    Maximum:10000
    Units:ppm

    Sc
    Scandium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Sr
    Strontium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:1
    Maximum:10000

    Th
    Thorium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Range of values
    Minimum:20
    Maximum:10000
    Units:ppm

    Ti
    Titanium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:10
    Units:%

    Tl
    Thallium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:10
    Maximum:10000
    Units:ppm

    U
    Uranium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:10
    Maximum:10000
    Units:ppm

    V
    Vanadium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    W
    Tungsten values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:10
    Maximum:10000
    Units:ppm

    Zn
    Zinc values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:2
    Maximum:10000
    Units:ppm

    Table3.csv
    Location and description of rock samples collected for whole-rock major- and minor-oxide analyses in the northern Fairbanks mining district, Circle quadrangle, Alaska (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample Number
    Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

    Generic example of unique sample identifier: 20YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials represent the following: 'JEA' = Jen Athey; 'MBW' = Melanie Werdon; 'RN' = Rainer Newberry; 'LF' = Larry Freeman; 'Z' = David Szumigala; "RL" = Richard Lessard.

    Latitude
    Latitude (Source: Alaska Division of Geological & Geophysical Surveys)

    Latitude in degrees for UTM Zone 3, NAD 27

    Longitude
    Longitude (Source: Alaska Division of Geological & Geophysical Surveys)

    Longitude in degrees for UTM Zone 3, NAD 27

    UTM E
    Easting (Source: Alaska Division of Geological & Geophysical Surveys)

    Easting for UTM Zone 6, NAD 27

    UTM N
    Northing (Source: Alaska Division of Geological & Geophysical Surveys)

    Northing for UTM Zone 6, NAD 27

    Zone
    UTM Zone (Source: Alaska Division of Geological & Geophysical Surveys)

    06W is UTM zone for all samples in this data set

    Description
    Brief rock description (Source: Alaska Division of Geological & Geophysical Surveys)

    Brief rock description

    Table4.csv
    Major-oxide, minor-oxide, and trace-element analyses for rocks collected in the northern Fairbanks mining district, Circle Quadrangle, Alaska. Elements that were not analyzed for a particular sample are denoted by '-'. (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample
    Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

    Generic example of unique sample identifier: 20YYAAA9999X, where YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X=unique alpha character designating a sample was taken at the field station

    SiO2
    SiO2 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    Al2O3
    Al2O3 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    Fe2O3
    Fe2O3 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. All iron is expressed as Fe2O3. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    CaO
    CaO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    MgO
    MgO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    Na2O
    Na2O values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    K2O
    K2O values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    Cr2O3
    Cr2O3 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    TiO2
    TiO2 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    MnO
    MnO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    P2O5
    P2O5 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    SrO
    SrO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    BaO
    BaO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    LOI
    Loss on ignition (LOI) values expressing loss of mass determined by gravimetric measurement after heating to 1000 degrees Celsius and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:100
    Units:%

    Total
    Calculated total for oxides in sample. Shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

    Range of values
    Minimum:0.01
    Maximum:105
    Units:%

    Table5.csv
    Location of stream sediment samples collected for trace-element geochemical analyses in the northern Fairbanks mining district, Circle quadrangle, Alaska (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample Number
    Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

    Generic example of unique sample identifier: 20YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials represent the following: 'JEA' = Jen Athey; 'MBW' = Melanie Werdon; 'RN' = Rainer Newberry; 'LF' = Larry Freeman; 'Z' = David Szumigala; "SEH" = Sharon Hansen; "RL" = Richard Lessard.

    Latitude
    Latitude (Source: Alaska Division of Geological & Geophysical Surveys)

    Latitude in degrees for UTM Zone 3, NAD 27

    Longitude
    Longitude (Source: Alaska Division of Geological & Geophysical Surveys)

    Longitude in degrees for UTM Zone 3, NAD 27

    UTM E
    Easting (Source: Alaska Division of Geological & Geophysical Surveys)

    Easting for UTM Zone 6, NAD 27

    UTM N
    Northing (Source: Alaska Division of Geological & Geophysical Surveys)

    Northing for UTM Zone 6, NAD 27

    Zone
    UTM Zone (Source: Alaska Division of Geological & Geophysical Surveys)

    06W is UTM zone for all samples in this data set

    Description
    Brief rock description (Source: Alaska Division of Geological & Geophysical Surveys)

    Brief rock description

    Description
    Brief rock description (Source: Alaska Division of Geological & Geophysical Surveys)

    Brief rock description

    Table6.csv
    Concentrations of trace elements in stream sediment samples collected in the northern Fairbanks mining district, Circle quadrangle, Alaska (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample Number
    Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

    Generic example of unique sample identifier: 20YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials represent the following: 'JEA' = Jen Athey; 'MBW' = Melanie Werdon; 'RN' = Rainer Newberry; 'LF' = Larry Freeman; 'Z' = David Szumigala; "SEH" = Sharon Hansen; "RL" = Richard Lessard. Samples that include the text "rerun" indicate that a second, and in one instance a third Au analysis was done on the sample pulp at DGGS' request

    Au
    Gold values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per billion (ppb). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    Range of values
    Minimum:.5
    Maximum:10000
    Units:ppb

    Ag
    Silver values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:200
    Units:ppm

    Al
    Aluminum values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.01
    Maximum:20
    Units:%

    As
    Arsenic values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possible volatilization during fuming may result in some loss of this element and in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Ba
    Barium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Be
    Beryllium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:1000
    Units:ppm

    Bi
    Bismuth values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:4000
    Units:ppm

    Ca
    Calcium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.01
    Maximum:40
    Units:%

    Cd
    Cadmium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:4000
    Units:ppm

    Ce
    Cerium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:2000
    Units:ppm

    Co
    Cobalt values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.2
    Maximum:4000
    Units:ppm

    Cr
    Chromium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Cu
    Copper values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:10000
    Units:ppm

    Fe
    Iron values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.01
    Maximum:60
    Units:%

    Hf
    Hafnium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:1000
    Units:ppm

    K
    Potassium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.01
    Maximum:10
    Units:%

    La
    Lanthanum values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:2000
    Units:ppm

    Li
    Lithium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:2000
    Units:ppm

    Mg
    Magnesium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.01
    Maximum:30
    Units:%

    Mn
    Manganese values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Mo
    Molybdenum values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:4000
    Units:ppm

    Na
    Sodium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.001
    Maximum:10
    Units:%

    Nb
    Niobium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:2000
    Units:ppm

    Ni
    Nickel values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:10000
    Units:ppm

    P
    Phosphorous values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.001
    Maximum:5
    Units:%

    Na
    Sodium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.001
    Maximum:10
    Units:%

    Pb
    Lead values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:10000
    Units:ppm

    Rb
    Rubidium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:2000
    Units:ppm

    S
    Sulfur values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.01
    Maximum:10
    Units:%

    Sb
    Antimony values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possible volatilization during fuming may result in some loss of this element and in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:4000
    Units:ppm

    Sc
    Scandium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:200
    Units:ppm

    Sn
    Tin values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:2000
    Units:ppm

    Sr
    Strontium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Ta
    Tantalum values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:2000
    Units:ppm

    Th
    Thorium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:4000
    Units:ppm

    Ti
    Titanium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in weight percent (%). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.001
    Maximum:10
    Units:%

    U
    Uranium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:4000
    Units:ppm

    V
    Vanadium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    W
    Tungsten values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:200
    Units:ppm

    Y
    Yttrium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:2000
    Units:ppm

    Zn
    Zinc values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:1
    Maximum:10000
    Units:ppm

    Zr
    Zirconium values acquired by analysis with inductively coupled plasma-mass spectrometry (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, dependent on mineralogy of this sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    ValueDefinition
    ---Not analyzed

    Range of values
    Minimum:.1
    Maximum:2000
    Units:ppm

    Table7.csv
    Detection limits and geochemical methods for trace-element analyses of rock samples. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Element
    Chemical symbol of element analyzed (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Formal codeset
    Codeset Name:Chemical symbol
    Codeset Source:Periodic Table of the Elements, National Institute of Standards and Technology NIST SP 966 (September 2003)

    Units
    Chemical composition units (by weight) (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    ValueDefinition
    ppmParts per million
    %percent

    Lower Detection Limit
    The lowest concentration at which the element can be detected (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Detection limit is a a number that is either the maximum or the minimum that a geochemical determination can be reliably made.

    Upper Detection Limit
    Value above which concentrations can not be accurately determined. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Detection limit is a a number that is either the maximum or the minimum that a geochemical determination can be reliably made.

    Analytical Method
    Instrumental method used by laboratory to determine concentration values. (Source: Alaska Division of Geological &Geophysical Surveys and ALS Chemex)

    ValueDefinition
    FA-ICP-AESInductive coupled plasma-atomic emission spectroscopy following a 30g fire assay fusion.
    ICP-AESInductive coupled plasma-atomic emission spectroscopy

    Digestion
    Method used to get the sample into a form that is used by the analytical method to determine geochemical concentrations. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    ValueDefinition
    4 Acidfour-acid, near-total digestion

    Table8.csv
    Detection limits geochemical methods for for major- and minor-oxide analyses of whole-rock samples (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Element
    Chemical formula of element analyzed (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    ValueDefinition
    Fe2O3Total iron content calculated as ferric iron
    LOILoss on ignition, difference after heating to 1000 degrees Celsius determined by gravimetric measurement
    TotalSum of the concentrations of all the oxides and LOI

    Formal codeset
    Codeset Name:Major and minor oxide chemical formulas
    Codeset Source:Alaska Division of Geological & Geophysical Surveys and ALS Chemex

    Units
    Chemical composition units (by weight) (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    ValueDefinition
    %percent

    Lower Detection Limit
    The lowest concentration at which the element can be detected (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Detection limit is a a number that is either the maximum or the minimum that a geochemical determination can be reliably made.

    Upper Detection Limit
    Value above which concentrations can not be accurately determined. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Detection limit is a a number that is either the maximum or the minimum that a geochemical determination can be reliably made.

    Analytical Method
    Instrumental method used by laboratory to determine concentration values. (Source: Alaska Division of Geological &Geophysical Surveys and ALS Chemex)

    ValueDefinition
    LBF-XRFlithium borate fusion, X-ray fluorescence spectrometry
    gravimetricA value determined by gravimetric measurement
    calculationA value determined by computation

    Table9.csv
    Detection limits and geochemical methods for trace-element analyses of stream sediment samples. (Source: Alaska Division of Geological & Geophysical Surveys and Acme Labs)

    Element
    Chemical symbol of element analyzed (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Formal codeset
    Codeset Name:Chemical symbol
    Codeset Source:Periodic Table of the Elements, National Institute of Standards and Technology NIST SP 966 (September 2003)

    Units
    Chemical composition units (by weight) (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    ValueDefinition
    ppbparts per billion
    ppmParts per million
    %percent

    Lower Detection Limit
    The lowest concentration at which the element can be detected (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Detection limit is a a number that is either the maximum or the minimum that a geochemical determination can be reliably made.

    Upper Detection Limit
    Value above which concentrations can not be accurately determined. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    Detection limit is a a number that is either the maximum or the minimum that a geochemical determination can be reliably made.

    Analytical Method
    Instrumental method used by laboratory to determine concentration values. (Source: Alaska Division of Geological &Geophysical Surveys and ALS Chemex)

    ValueDefinition
    ICP-MSinductive coupled plasma-mass spectrometry

    Digestion
    Method used to get the sample into a form that is used by the analytical method to determine geochemical concentrations. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

    ValueDefinition
    Aqua-RegiaAqua-Regia digestion
    4 Acidfour-acid, near-total digestion

    Entity_and_Attribute_Overview:
    RDF 2008-1 has nine entities containing attributes that need to be defined. The entities are grouped in three thematic layers; each layer contains a sample location and description table (Tables 1, 3, and 5), a geochemical analysis data table (Tables 2, 4, and 6), and table describing analytical methods and detection limits (Tables 7, 8, and 9). The values in the "Sample Number" columns in tables 1, 4, and 7 correspond with the "Sample Number" columns in in tables 2, 5, and 8, respectively. Each row in tables 3, 6, an 9 give detection limits and methods for each of the columns in tables 2, 6, and 8 respectively.
    Entity_and_Attribute_Detail_Citation: This report


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, Division of Geological & Geophysical Surveys. Partial funding for the geologic mapping and geochemical analyses was also provided through the U.S. Geological Survey STATEMAP Program under award number 07HQAG0076 and the General Fund.

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


Why was the data set created?

The analyses in this report were acquired as part of a geologic mapping program, the purpose of which is to provide 1:50,000-scale geologic mapping of a portion of the Northeast Fairbanks airborne geophysical surveys released by DGGS in 2006 (Burns et al., 2006). The geophysical survey (helicopter-based aeromagnetic and electromagnetic data) 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?

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

    Date: Jun-2007 (process 1 of 8)
    Fieldwork - Rock samples of visibly mineralized rock, or rock exhibiting features associated with mineralization, were preferentially collected and analyzed for geochemical trace elements. Spatially these rocks were collected randomly. Unweathered or minimally weathered rock samples were preferentially selected for analysis.

    Date: 2007 (process 2 of 8)
    Fieldwork - Rock samples collected for major-oxide, minor-oxide, and trace elements include samples representative of a typical lithology, igneous or possible meta-igneous samples in order to determine composition, and samples whose petrogenetically important trace-elements could indicate their original tectonic setting. Unweathered or minimally weathered rock samples were preferentially selected for analysis. Spatially these rocks were collected randomly.

    Date: Jun-2007 (process 3 of 8)
    Fieldwork - Stream sediment samples were collected from first-order streams just above the confluence with second-order streams, except for sample 07Z440.1B that was taken from a second-order stream. Silt- and clay-sized (-80 mesh) sediment was preferentially sampled from active stream channels, at or below water level. Samples were collected from gravel and sand bars where possible, and obvious coarse sand, organic-rich material, and loess were avoided. Pebbles and large organic debris was removed from the sample using a inch sieve. Samples were collected over a 15- to 30-meter stretch of the stream. Sample size was generally half or more of a 7-inch by 11-inch sample bag containing sand-sized or finer material.

    Date: 2007 (process 4 of 8)
    Sample Preparation - Rock samples were crushed with a Terminator oscillating jaw crusher with chrome steel alloy plates so that at least 70 percent of the material passes through a -10 mesh (2 mm) screen. Representative aliquots of 250 grams each were taken using a stainless steel riffle splitter. These samples were then pulverized in a chrome steel ring mill so that 85 percent of the sample passed through a -200 mesh (75 micron) screen. Trace-element analyses, the whole rock major element analyses and the gold analyses were performed using representative splits of each 250 gram pulp. Sample preparation was conducted at the ALS Chemex sample preparation facility in Fairbanks, Alaska.

    Date: 2007 (process 5 of 8)
    Sample Preparation - Sediment samples were dried and sieved to -80 mesh (2 mm) material by stainless steel screens. Representative aliquots of 250 grams were taken using a stainless steel riffle splitter. These samples were then pulverized in a chrome steel ring mill so that 85 percent of the sample passed through a -200 (75 micron) mesh screen. Most trace-element analyses were performed on a 0.25 gram split while gold analyses were performed on a 15 gram representative split. Sample preparation was conducted by Alaska Assay Laboratories at Fairbanks, Alaska.

    Date: 2007 (process 6 of 8)
    Analysis - Initially, all rock samples for trace element geochemistry (Table 2) were assayed for gold by inductive coupled plasma-atomic emission spectroscopy following a 30g fire assay fusion (FA-ICP). Trace-element geochemical analyses were performed by inductive coupled plasma-atomic emission spectroscopy (ICP-AES) methods after four-acid, near-total digestion. This method of digestion is possibly incomplete for some elements and may result in lower analytical results for these elements. The elements that may be affected by incomplete digestion, analytical methods, and lower and upper reporting limits are tabulated in Table 7. All rock trace metal analyses were performed by ALS Chemex.

    Date: 2007 (process 7 of 8)
    Analysis - All whole rock analyses (Table 4) were performed by ALS Chemex. Major and minor element oxides were determined by X-ray fluorescence spectrometry following a lithium borate fusion (WEI-GRA06). Analytical methods and detection limits are tabulated in Table 8.

    Date: 2007 (process 8 of 8)
    Analysis - Stream sediment samples (Table 6) were assayed for gold by inductively coupled plasma-mass spectrometry (ICP-MS) following Aqua-Regia digestion. Trace element geochemical analyses were performed by ICP-MS methods after four-acid, near-total digestion. Digestion involved heating a 0.25 g split in HNO3-HClO4-HF to fuming and then taking it to dryness. The residue was dissolved in HCl. This method of digestion is possibly incomplete for some elements and may result in lower analytical results for these elements. In addition, some loss of certain elements may result from volatilization during fuming. The elements that may be affected by incomplete digestion and volatilization, analytical methods, and lower and upper detection limits are tabulated in Table 9. Analyses of stream sediment samples where conducted by Acme Labs of Vancouver, B.C. Canada.

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

    Burns, L.E., Surveys, Fugro Airborne , and Stevens Exploration Management Corp., 2006, Line, grid, and vector data and plot files for the airborne geophysical survey data of northeast Fairbanks area, Fairbanks and Circle mining districts, Interior Alaska: Geophysical Report GPR 2006-3.

    Online Links:

    Other_Citation_Details: 1 disk
    Staff, DGGS, 1986, Analytical data for the Steese-White Mountains project: Public Data File PDF 86-91.

    Online Links:

    Other_Citation_Details: 252 p., 6 sheets, scale 1:63,360.
    Wiltse, M.A., Metz, P.A., Robinson, M.S., and Pinney, D.S., 1994, Geochemical trace-element data for stream sediment samples collected in the Circle mining district, 1983: Public Data File PDF 94-30A, Alaska Division of Geological & Geophysical Surveys, Fairbanks.

    Online Links:

    Other_Citation_Details: 86 p., 1 sheet, scale 1:63,360
    Wiltse, M.A., Queen, L.K., and Pinney, D.S., 2007, Geochemical trace-element data for rock samples collected in the Circle mining district, June 1993: Public Data File PDF 94-31A, Alaska Division of Geological & Geophysical Surveys, Fairbanks.

    Online Links:

    Other_Citation_Details: 33 p., 1 sheet, scale 1:63,360
    Newberry, R.J., Wiltse, M.A.,, Queen, L.K., and Pinney, D.S., 1994, Geochemical major-oxide and trace-element data for rock samples collected in the Circle mining district, June 1993: Public Data File PDF 94-32A, Alaska Division of Geological & Geophysical Surveys, Fairbanks.

    Online Links:

    Other_Citation_Details: 94-32A, 7 p., 1 sheet, scale 1:63,360


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

  1. How well have the observations been checked?

    All rock geochemical and whole rock analyses were performed by by ALS Chemex. Stream sediment geochemical analyses were performed by performed by Alaska Assay Laboratories (sample preparation) and Acme Labs (analyses). Rock samples were assayed for gold by inductive coupled plasma-atomic emission spectroscopy following a 30g fire assay fusion (FA-ICP). Trace-element geochemical analyses on rock samples were performed by inductive coupled plasma-atomic emission spectroscopy (ICP-AES) methods after four-acid, near-total digestion. This method of digestion is possibly incomplete for some elements and may result in lower analytical results for these elements. The elements that may be affected by incomplete digestion, analytical methods, and lower and upper reporting limits are tabulated in Table 7. Whole rock analyses (Table 4) were performed by ALS Chemex. Major and minor element oxides were determined by X-ray fluorescence spectrometry following a lithium borate fusion (WEI-GRA06). Analytical methods and detection limits are tabulated in Table 8. Stream sediment samples were assayed for gold by inductively coupled plasma-mass spectrometry (ICP-MS) following Aqua-Regia digestion. Trace element geochemical analyses were performed by ICP-MS methods after four-acid, near-total digestion. Digestion involved heating a 0.25 g split in HNO3-HClO4-HF to fuming and then taking it to dryness. The residue was dissolved in HCl. This method of digestion is possibly incomplete for some elements and may result in lower analytical results for these elements. In addition, some loss of certain elements may result from volatilization during fuming. The elements that may be affected by incomplete digestion and volatilization, analytical methods, and lower and upper detection limits are tabulated in Table 9.

  2. How accurate are the geographic locations?

    Location data were downloaded from Garmin 12XL GPS units into an Access database.

  3. How accurate are the heights or depths?

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

    This dataset contains all of the analyses for samples collected for trace-element rock geochemistry, whole rock major and minor oxide geochemistry, and trace element stream sediment geochemistry in the northeast Fairbanks project area in the summer of 2007. Whole-rock trace element analyses for rock samples will be determined by the Advanced Instrumentation Laboratory at the University of Alaska Fairbanks (UAF) and will be released at a later date.

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

    No topologic relationships are present in data.


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 hard copies 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?

    Raw Data File 2008-1 v. 1.0.1

  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. What hardware or software do I need in order to use the data set?

    CSV (Comma Separated Value) files can be imported and formatted with Microsoft Excel, OpenOffice.org Calc, or most spreadsheet and text editor programs.


Who wrote the metadata?

Dates:
Last modified: 06-May-2008
Last Reviewed: 06-May-2008
To be reviewed: 18-Dec-2009
Metadata author:
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
c/o Lawrence Freeman
Geologist in the DGGS Minerals Section
3354 College Road
Fairbanks, AK 99709-3707
USA

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

Hours_of_Service:
8:00 am to 4:30 pm, Monday through Friday, except State holidays.
Contact_Instructions:
Please contact us through the e-mail address given above whenever possible.
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.6 on Tue May 06 14:29:37 2008