Geochemical, major-oxide, minor-oxide, trace-element, and rare-earth-element data from rock, stream sediment, and pan-concentrate samples collected in 2011 in the William Henry Bay area, Juneau C-4 and D-4 quadrangles, Southeast Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title:
Geochemical, major-oxide, minor-oxide, trace-element, and rare-earth-element data from rock, stream sediment, and pan-concentrate samples collected in 2011 in the William Henry Bay area, Juneau C-4 and D-4 quadrangles, Southeast Alaska
Abstract:
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys conducted reconnaissance sampling of the William Henry Bay area in the Juneau C-4 and D-4 quadrangles, August 9-13, 2011. This sampling project was part of a statewide assessment of Alaska's potential for rare-earth element mineralization. During the William Henry Bay field project 46 rock, sediment, and heavy-mineral concentrate samples were collected for geochemical analysis (geochemical, major oxide, minor oxide, trace element, and rare earth elements).
Supplemental_Information:
The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships. Layers are named to correspond with the name(s) of the file(s). This dataset is described as a single layer titled:
 geochemical_data: table (CSV format) listing analyses for the full suite of rare-earth elements to characterize the area's igneous and mineralized rocks
  1. How should this data set be cited?

    Werdon, M. B., Gallagher, P. E., and Blessington, M. J., 2012, Geochemical, major-oxide, minor-oxide, trace-element, and rare-earth-element data from rock, stream sediment, and pan-concentrate samples collected in 2011 in the William Henry Bay area, Juneau C-4 and D-4 quadrangles, Southeast Alaska: Raw Data File RDF 2012-2, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 2 p., digital download

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -135.2885
    East_Bounding_Coordinate: -135.2312
    North_Bounding_Coordinate: 58.7621
    South_Bounding_Coordinate: 58.7172

  3. What does it look like?

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

    Beginning_Date: 2011
    Ending_Date: 2012
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: document, digital download

  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?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in decimal degrees.

      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 1/294.978698214.

  7. How does the data set describe geographic features?

    rdf2012-2-geochemical-data.csv
    Coordinates, descriptions, and geochemical data for rock, pan concentrate, and stream sediment samples. (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample_Num
    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: 'MBW' = Melanie B. Werdon.

    Latitude
    Latitude, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:58.7172
    Maximum:58.7621
    Units:decimal degrees

    Longitude
    Longitude, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:-135.2885
    Maximum:-135.2312
    Units:decimal degrees

    Descript1
    First 254 characters of brief field description of sample. (Source: Alaska Division of Geological & Geophysical Surveys)

    Characters 1-254 of brief field description.

    Descript2
    Extension of brief sample description for descriptions extending past 254 characters in length. (Source: Alaska Division of Geological & Geophysical Surveys)

    Characters 255 to 508 of brief field description.

    Descript3
    Extension of brief sample description for descriptions extending past 508 characters in length. (Source: Alaska Division of Geological & Geophysical Surveys)

    Characters 509 to 762 of brief field description.

    SiO2_pct
    SiO2 values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.01%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:11.65
    Maximum:91.19
    Units:%

    TiO2_pct
    TiO2 values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.001%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys.)

    Range of values
    Minimum:0.007
    Maximum:2.595
    Units:%

    Al2O3_pct
    Al2O3 values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.01%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1.49
    Maximum:23.33
    Units:%

    Fe2O3t_pct
    Total Fe2O3 values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.01%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.68
    Maximum:15.99
    Units:%

    MnO_pct
    MnO values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.001%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.035
    Maximum:0.362
    Units:%

    MgO_pct
    MgO values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.01%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys.)

    Range of values
    Minimum:0.11
    Maximum:10.32
    Units:%

    CaO_pct
    CaO values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.01%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys.)

    Range of values
    Minimum:0.2
    Maximum:40.33
    Units:%

    Na2O_pct
    SiO2 values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.01%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys.)

    Range of values
    Minimum:0.03
    Maximum:6.72
    Units:%

    K2O_pct
    K2O values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.01%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys.)

    Range of values
    Minimum:0.03
    Maximum:10.61
    Units:%

    P2O5_pct
    P2O5 values obtained by analysis by inductively-coupled plasma following metaborate/tetraborate fusion. Results presented in percentage. Lower detection limit 0.01%, upper detection limit 100.00%. (Source: Alaska Division of Geological & Geophysical Surveys.)

    Range of values
    Minimum:0.01
    Maximum:1.36
    Units:%

    LOI_pct
    Percentage of sample lost as a result of heating, determined through gravimetric analysis and presented as a percentage. (Source: Alaska Division of Geological & Geophysical Surveys.)

    Range of values
    Minimum:0.79
    Maximum:36.52
    Units:%

    Total_pct
    Mathematically derived sum of all major oxides, minor oxides, and material lost during heating (LOI). (Source: Alaska Division of Geological & Geophysical Surveys.)

    Range of values
    Minimum:88.27
    Maximum:100.90
    Units:%

    Au_g_tonne
    Au values were obtained through gravimetric analysis following fire assay. Results presented in grams per metric ton, lower detection limit 0.03 g/tonne. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.03 grams/tonne
    NULLNull value; not analyzed.

    Range of values
    Minimum:0.03
    Maximum:1.97
    Units:g/tonne

    Au2_ppb
    Au values obtained through instrumental neutron activation analysis (INAA) following fire assay. Results presented in parts per billion, lower detection limit 1 ppb. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 1 ppb.
    NULLNull value; not analyzed.

    Mass_g
    Mass of sample in grams for samples analyzed for Au by INAA (Au2_ppb). (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    NULLNull value; not analyzed.

    Range of values
    Minimum:8.49
    Maximum:12.5
    Units:g

    Ag_ppm
    Ag values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of .5 ppm.

    Range of values
    Minimum:0.60
    Maximum:3.80
    Units:ppm

    As_ppm
    As values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 5 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 5 ppm.

    Range of values
    Minimum:6.00
    Maximum:26.00
    Units:ppm

    Ba_ppm
    Ba values obtained by inductively coupled plasma (ICP) analysis following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 3 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:17.00
    Maximum:83430.0
    Units:ppm

    Be_ppm
    Be values obtained by inductively coupled plasma (ICP) analysis following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 1 ppm.

    Range of values
    Minimum:1
    Maximum:5
    Units:ppm

    Bi_ppm
    Bi values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.4 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.4 ppm.

    Range of values
    Minimum:0.4
    Maximum:5.1
    Units:ppm

    Co_ppm
    Co values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 1 ppm.

    Range of values
    Minimum:1.00
    Maximum:43.00
    Units:ppm

    Cr_ppm
    Ag values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 20 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 20 ppm.

    Range of values
    Minimum:20.00
    Maximum:350.00
    Units:ppm

    Cs_ppm
    Cs values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.5 ppm.

    Range of values
    Minimum:0.50
    Maximum:2.90
    Units:ppm

    Cu_ppm
    Cu values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 10 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 10 ppm.

    Range of values
    Minimum:10.00
    Maximum:170.00
    Units:ppm

    Ga_ppm
    Ga values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:1
    Maximum:35
    Units:ppm

    Hf_ppm
    Hf values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.2 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.2 ppm.

    Range of values
    Minimum:0.30
    Maximum:8.60
    Units:ppm

    In_ppm
    In values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.2 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.2 ppm

    Mo_ppm
    Mo values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 2 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 2 ppm.

    Range of values
    Minimum:2.00
    Maximum:11.00
    Units:ppm

    Nb_ppm
    Nb values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 1 ppm.

    Range of values
    Minimum:1.00
    Maximum:59.00
    Units:ppm

    Ni_ppm
    Ni values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 20 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 20 ppm.

    Range of values
    Minimum:20.00
    Maximum:90.00
    Units:ppm

    Ge_ppm
    Ge values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 1 ppm.

    Range of values
    Minimum:1.00
    Maximum:3.00
    Units:ppm

    Pb_ppm
    Pb values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 5 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 5 ppm.

    Range of values
    Minimum:5.00
    Maximum:279.00
    Units:ppm

    Rb_ppm
    Rb values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 2 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 2 ppm.

    Range of values
    Minimum:3
    Maximum:182
    Units:ppm

    Sb_ppm
    Ag values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.5 ppm.

    Range of values
    Minimum:0.9
    Maximum:6.5
    Units:ppm

    Sc_ppm
    Sc values obtained by inductively coupled plasma (ICP) analysis following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 1 ppm.

    Range of values
    Minimum:1
    Maximum:45
    Units:ppm

    Sn_ppm
    Sn values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 1 ppm.

    Range of values
    Minimum:1
    Maximum:2
    Units:ppm

    Sr_ppm
    Sr values obtained by inductively coupled plasma (ICP) analysis following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 2 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:58
    Maximum:2583
    Units:ppm

    Ta_ppm
    Ta values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm.

    Range of values
    Minimum:0.1
    Maximum:3.2
    Units:ppm

    Th_ppm
    Th values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:0.1
    Maximum:47.5
    Units:ppm

    Tl_ppm
    Tl values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm.

    Range of values
    Minimum:0.1
    Maximum:2.3
    Units:ppm

    U_ppm
    U values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm

    Range of values
    Minimum:0.1
    Maximum:14.8
    Units:ppm

    V_ppm
    V values obtained by inductively coupled plasma (ICP) analysis following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 5 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:13
    Maximum:410
    Units:ppm

    W_ppm
    W values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 1 ppm.

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

    Y_ppm
    Y values obtained by inductively coupled plasma (ICP) analysis following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 2 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 2 ppm.

    Range of values
    Minimum:4
    Maximum:37
    Units:ppm

    Zn_ppm
    Zn values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 30 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 30 ppm.

    Range of values
    Minimum:40
    Maximum:350
    Units:ppm

    Zr_ppm
    Zr values obtained by inductively coupled plasma (ICP) analysis following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 4 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 4 ppm.

    Range of values
    Minimum:11
    Maximum:547
    Units:ppm

    La_ppm
    La values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:0.4
    Maximum:187
    Units:ppm

    Ce_ppm
    Ce values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:0.7
    Maximum:318
    Units:ppm

    Pr_ppm
    Pr values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.05 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:0.07
    Maximum:29.4
    Units:ppm

    Nd_ppm
    Nd values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    Range of values
    Minimum:0.3
    Maximum:86.3
    Units:ppm

    Sm_ppm
    Sm values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm.

    Range of values
    Minimum:0.1
    Maximum:14.8
    Units:ppm

    Eu_ppm
    Eu values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.05 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.05 ppm.

    Range of values
    Minimum:0.1
    Maximum:3.95
    Units:ppm

    Gd_ppm
    Gd values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm.

    Range of values
    Minimum:0.6
    Maximum:10.1
    Units:ppm

    Tb_ppm
    Tb values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm

    Range of values
    Minimum:0.1
    Maximum:1.4
    Units:ppm

    Dy_ppm
    Dy values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm.

    Range of values
    Minimum:0.1
    Maximum:7.3
    Units:ppm

    Ho_ppm
    Ho values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm.

    Range of values
    Minimum:0.1
    Maximum:1.4
    Units:ppm

    Er_ppm
    Er values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm.

    Range of values
    Minimum:0.1
    Maximum:3.9
    Units:ppm

    Tm_ppm
    Tm values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.05 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.05 ppm.

    Range of values
    Minimum:0.05
    Maximum:0.64
    Units:ppm

    Yb_ppm
    Yb values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.1 ppm.

    Range of values
    Minimum:0.2
    Maximum:4.5
    Units:ppm

    Lu_ppm
    Lu values obtained by inductively coupled plasma - mass spectrometry (ICP-MS) following metaborate/tetraborate fusion. Results presented in parts per million, lower detection limit 0.04 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and Actlabs.)

    ValueDefinition
    -1Below detection limit of 0.04 ppm.

    Range of values
    Minimum:0.05
    Maximum:0.77
    Units:ppm


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 State's Rare Earth Elements and Strategic Minerals Assessment CIP funded by the Alaska State Legislature and managed by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.

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

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

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

    Contact_Instructions:
    You may view our web site at <http://www.dggs.alaska.gov> for the latest information on available data. Please e-mail your questions and data requests when possible.


Why was the data set created?

Fieldwork was performed to evaluate the mineral-resource potential of a block of State land near the mouth of William Henry Creek, and to investigate reported rare-earth-element, uranium, and thorium mineral occurrences on adjacent Tongass National Forest land. This fieldwork and sampling was conducted as part of the State's Rare Earth Element and Strategic Minerals Assessment project, which is designed to evaluate Alaska's potential for these resources.


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: Aug-2011 (process 1 of 3)
    Fieldwork - Rock, stream sediment, and heavy-mineral pan-concentrate samples were collected from outcrops, float fields, and stream beds in the William Henry Bay area. Rock samples were chosen and collected on the basis of potential for mineralization (as identified by visual inspection). Igneous rocks as well as rocks that exhibited veining or alteration were preferentially chosen for geochemical examination. Heavy mineral concentrates were isolated by hand-panning in the field.

    Date: Oct-2011 (process 2 of 3)
    Sample Prep - All sample preparation for analysis was performed by Actlabs. Rocks intended for whole-rock analysis by Actlabs and those with a weathering rind were trimmed at DGGS with a tile saw prior to sample preparation at the laboratory. Rock samples were crushed to minus-10 mesh (1.7mm), mechanically split by riffling, and then pulverized to 95% minus-150 mesh (105 microns). A mild steel mill was used for pulverizing to minimize contamination of samples. Stream sediment and pan concentrate samples were dried at a temperature of 60C and then sieved to minus 80 mesh (177 microns). For Code-8 REE analysis, both rock and sediment samples were further pulverized to minus-200 mesh (0.074mm) using a mild-steel mill. Cleaning sand was used after every sample preparation to prevent contamination.

    Date: Oct-2011 (process 3 of 3)
    Sample Analysis - All samples were analyzed for major oxides, minor oxides and petrologic trace elements, as well as ore-related trace elements and rare earth elements. In addition to the internal quality-control program at Actlabs, DGGS monitored analysis quality by inserting igneous-rock and REE standards of known composition into the sample roster for every sample batch. The major oxide, minor oxide, petrographic trace-element, and ore-related trace-element analyses were conducted using inductively-coupled plasma (ICP) and inductively-coupled plasma mass spectrometry (ICP-MS) following lithium metaborate/tetraborate fusion. Mass balance was used for the major-oxide and minor-oxide analyses as an additional quality control technique, requiring elemental totals of oxides to be between 98 and 101 percent. Gold assays were performed using gravimetric analysis following fire assay (FA-GRAV) on 29.16 grams of material. Separate splits of 4 samples were reanalyzed for gold using Instrumental Neutron Activation Analysis following fire assay (FA-INAA); grams of material analyzed is noted in the .csv file. Detection limits for each of the reported oxide and elemental values obtained by the various methods are documented in the metadata file.

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


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

  1. How well have the observations been checked?

    All geochemical, major-oxide, minor-oxide, trace-element, and rare-earth-element analyses were conducted by Actlabs. Analytical methods and detection limits are listed in attribute definitions. In addition to the internal quality-control program at Actlabs, DGGS monitored analysis quality by inserting igneous-rock and REE standards of known composition into the sample roster for every sample batch.

  2. How accurate are the geographic locations?

    Location data were downloaded from Garmin eTrex Legend HCx GPS units into a Microsoft 2007 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 analysis for major-oxide, minor-oxide, trace-element, and rare-earth-element geochemistry complete at the time of publication for all samples collected in the William Henry Bay area during August 2011.

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

    not applicable


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. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data 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 or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  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 website (<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?

    RDF 2012-2

  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?


Who wrote the metadata?

Dates:
Last modified: 23-Apr-2012
Metadata author:
Metadata manager
3354 College Road
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 Mon Apr 23 16:24:13 2012