40Ar/39Ar data, Seward Peninsula, Alaska

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What does this data set describe?

Title: 40Ar/39Ar data, Seward Peninsula, Alaska
Abstract:
This Alaska Division of Geological & Geophysical Surveys (DGGS) Raw Data File presents 40Ar/39Ar age dating results for a volcanic whole-rock sample, selected minerals from various metamorphic rocks and igneous dikes, and white mica from both metamorphic- and hydrothermal-mineralization-related veins encountered on the southern Seward Peninsula, as well as select minerals from one plutonic rock from Cape Denbeigh, eastern Norton Sound, Alaska. Cooling ages on glaucophane, barroisite, amphibole, paragonite, and biotite from metamorphic rocks range from 84 Ma to 209 Ma. The cooling age of white mica in a possible fault zone is 144 Ma. Cooling ages on late-stage metamorphic minerals (winchite and white mica) from veins cutting foliation in metamorphic rocks range from 117 Ma to 139 Ma. Cooling ages on white mica and adularia from hydrothermal mineralization-related veins range from 105 to 131 Ma. The cooling age for one highly alkalic dike is 107 Ma. Cooling ages for younger mafic dikes range from 80 Ma to 84 Ma. The preferred age on a whole-rock sample of basalt is 0.780 +/- 0.011 Ma. Closure and cooling ages on the Cape Denbeigh granite (hornblende, K-feldspar) are 119 Ma and 113 Ma, respectively.
Supplemental_Information: 
border:    Outline of the study area
arar-summary-data-locations:    Identification numbers, coordinates, sample descriptions, and summary ages of each sample
step-heating-data:    Power output levels and resultant measurements from each sample run
  1. How should this data set be cited?

    Layer, P.W., Werdon, M.B., Newberry, R.J., Drake, Jeffrey, and Benowitz, J.A., 2015, 40Ar/39Ar data, Seward Peninsula, Alaska: Raw Data File RDF 2015-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 59 p.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -165.4200
    East_Bounding_Coordinate: -161.5205
    North_Bounding_Coordinate: 65.0936
    South_Bounding_Coordinate: 64.3818

  3. What does it look like?

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

    Beginning_Date: 2003
    Ending_Date: 2015
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: report and digital data

  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 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    rdf2015-3-border.shp
    Outline of the study area (Source: Alaska Division of Geological & Geophysical Surveys)

    rdf2015-3-arar-summary-data-locations.xlsx
    Identification numbers, coordinates, sample descriptions, and summary ages of each sample (Source: Alaska Division of Geological & Geophysical Surveys)

    SAMPLE
    Label assigned in the field to identify the sample. (Source: Alaska Division of Geological & Geophysical Surveys)

    Generic example of a sample identifier: YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database.

    LAB_SAMPLE_NUMBER
    Label used by the lab to identify the sample. (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    The lab sample number is typically identical to the field sample number. However, in some cases, the sample number provided by the lab does differ from the number assigned in the field. We provide both numbers to document instances in which the sample numbers in the lab files differ from the field sample number.

    RUN_NUMBER
    Identifies the laboratory run/heating step for the specified sample. (Source: Alaska Division of Geological & Geophysical Surveys and the Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:1
    Maximum:15

    COLLECTOR
    The geologist who collected the sample. (Source: Alaska Division of Geological & Geophysical Surveys)

    The samples presented in this report were collected by the authors or other DGGS staff.

    LONGITUDE
    Longitude, NAD83 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:-165.415
    Maximum:-161.525557

    LATITUDE
    Latitude, NAD83 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:64.38686655
    Maximum:65.09361283

    DATED_MATERIAL
    Indicates the type of material that was used for analysis (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    The type of material that was selected for dating varied according to mineral composition and grainsize of the submitted rock sample. This field specifies whether the age was derived from a mineral separate (generally 1 to 10 individual crystals dated together as a single run), a single crystal, or the whole rock.

    MINERAL
    Indicates the mineral that was used for analysis (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the sample was a whole rock or that the mineral type was not recorded by the lab

    The minerals selected for dating would typically be grains of biotite, hornblende, or muscovite.

    DESCRIPTION
    Description of the sample (Source: Alaska Division of Geological & Geophysical Surveys)

    Characters 1 to 254 of a brief sample or station description.

    MONITOR_MINERAL
    The monitor mineral(standard) used to determine the J parameter (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    References for each monitor are provided in the tables and in the accompanying report.

    IRRADIATION_POSITION
    The samples were irradiated in various positions in the uranium-enriched research reactor of McMaster University in Hamilton, Ontario, Canada. This value lists the irradiation position for each sample. (Source: McMaster University in Hamilton, Ontario, Canada)

    Samples were irradiated in position 5c or 8b.

    INTEGRATED_AGE_MA
    Integrated age and age error in million years (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    The values are a concatenation of the integrated age determination and the calculated error associated with the integrated age determination

    PLATEAU_AGE_MA
    Plateau age and age error in million years (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the PLATEAU_AGE_MA value was not calculated by the lab

    The values are a concatenation of the plateau age determination and the calculated error associated with the plateau age determination

    PLATEAU_PERCENT_39AR
    Value in percent of the 39 Ar used in that portion of the spectrum to determine the plateau age (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:36
    Maximum:100
    Units:percent

    PLATEAU_MSWD
    The mean square weighted deviation of the plateau age calculation (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the value was not calculated by the lab

    Range of values
    Minimum:0.2
    Maximum:2.3

    PLATEAU_REMARKS
    Comments and additional values that pertain to the plateau age determination method or interpretation. (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the PLATEAU_REMARKS value was not provided by the lab

    Free text

    W_M_AGE_MA
    Weighted mean age and age error in million years (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the W_M_AGE_MA value was not calculated by the lab

    The values are a concatenation of the weighted mean age determination and the calculated error associated with the weighted mean average age determination

    W_M_AGE_PCT_39AR
    Value in percent of the 39 Ar used in that portion of the spectrum to determine the weighted mean age (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:33
    Maximum:100
    Units:percent

    W_M_AGE_MSWD
    The mean square weighted deviation of the weighted mean age calculation (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the value was not calculated by the lab

    Range of values
    Minimum:2.5
    Maximum:131

    W_M_AGE_REMARKS
    Comments and additional values that pertain to the weighted mean age determination method or interpretation. (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the W_M_AGE_REMARKS value was not provided by the lab

    Free text

    AVG_AGE_MA
    Average age and age error in million years (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the AVG_AGE_MA value was not calculated by the lab

    The values are a concatenation of the average age determination and the calculated error associated with the average age determination

    AVG_AGE_MSWD
    The mean square weighted deviation of the average age calculation (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the value was not calculated by the lab

    Range of values
    Minimum:0.04
    Maximum:1.6

    AVG_AGE_REMARKS
    Comments and additional values that pertain to the average age determination method or interpretation. (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the AVG_AGE_REMARKS value was not provided by the lab

    Free text

    ISOCHRON_AGE
    Isochon age and age error in million years (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the ISOCHRON_AGE value was not provided by the lab

    The values are a concatenation of the isochron age determination and the calculated error associated with the isochron age determination

    ISOCHRON_MSWD
    The mean square weighted deviation of the isochron age calculation (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the value was not calculated by the lab

    Range of values
    Minimum:0.89
    Maximum:0.89

    ISOCHRON_REMARKS
    Comments and additional values that pertain to the isochon age determination method or interpretation. (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the ISOCHRON_REMARKS value was not provided by the lab

    Free text

    AGE_TYPE_PREFERRED
    Indicates AGE_TYPE_PREFERRED age. (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    A discussion of the preferred age for each analysis is provided in the accompanying lab report. The possible values are: plateau, isochron, weighted average, or integrated.

    PREFERRED_AGE
    The values are a concatenation of the preferred age determination and the calculated error associated with the preferred age determination (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    The preferred age for each analysis is discussed in detail in the accompanying lab report.

    rdf2015-3-step-heating-data.xlsx
    Power output levels and resultant measurements from each sample run (Source: Alaska Division of Geological & Geophysical Surveys)

    SAMPLE
    Label assigned in the field to identify the sample. (Source: Alaska Division of Geological & Geophysical Surveys)

    Generic example of a sample identifier: YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database.

    LAB_SAMPLE_NUMBER
    Label used by the lab to identify the sample. (Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    The lab sample number is typically identical to the field sample number. However, in some cases, the sample number provided by the lab does differ from the number assigned in the field. We provide both numbers to document instances in which the sample numbers in the lab files differ from the field sample number.

    Laser_mW
    Laser output level in megawatts (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the values in the row were calculated by weighting the individual heating steps by the fraction of 39Ar released.

    Range of values
    Minimum:150
    Maximum:10000
    Units:megawatts

    Integrated
    We indicate whether the values in the row were derived from a heating step or calculated by weighting the individual heating steps by the fraction of 39Ar released. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLThe values in the row were derived from a heating step
    Integratedthe values in this row were calculated by weighting the individual heating steps by the fraction of 39Ar released

    Cum39Ar
    Cumulative ratio of 39Argon released at this step (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    ValueDefinition
    NULLA NULL or blank values indicates that the value was not applicable or not calculated by the lab

    Range of values
    Minimum:0.0002
    Maximum:1

    Me40Ar39Ar
    Measured 40Ar/39Ar ratio for each heating step, corrected for blank and 39Ar decay (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:7.50329
    Maximum:11847.39

    Er40Ar39Ar
    The one sigma error for each 40Ar/39Ar measurement (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:0.02
    Maximum:482.58

    Me37Ar39Ar
    The ratio of measured 37Ar to measured 39Ar for each heating interval for each sample corrected for blank and 37Ar and 39Ar decay (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:-0.25561
    Maximum:493.17

    Er37Ar39Ar
    The one sigma error for each 37Ar/39Ar measurement (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:0.00003
    Maximum:57.597

    Me36Ar39Ar
    Ratio of measured 36Ar to measured 39Ar for each step interval for each sample corrected for blank and 39Ar decay (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:-0.16438
    Maximum:38.246

    Er36Ar39Ar
    The one sigma error for each 36Ar/39Ar measurement (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:0.00002
    Maximum:1.575

    Atm40Ar
    Percent of 40Ar which is atmospheric in composition at each step level (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:-164.9
    Maximum:394

    ErAtm40Ar
    The one sigma error for the percent of 40Ar which is atmospheric in composition at each step level (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:0.05533
    Maximum:5.44042

    MeCaK
    Ratio of Calcium to Potassium as determined from 37Ar/39Ar (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:-0.46893
    Maximum:1402.51

    ErCaK
    The one sigma error for each Ca/K determination (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:0.00006
    Maximum:183.04

    MeClK
    Ratio of Chlorine to Potassium as determined from 38Ar/39Ar (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:-0.009
    Maximum:0.45923

    ErClK
    The one sigma error for each Cl/K determination (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:0.00001
    Maximum:0.0484

    Ar40Rad39ArK
    Ratio of radiogenic 40Ar to 39Ar derived from potassium (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:-136.144
    Maximum:657.55

    Er40ArRad39ArK
    One sigma error for each 40ArRad/39ArK value (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:0.024
    Maximum:84.526

    AgeMa
    Calculated age for each temperature step for each sample (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:-742.1
    Maximum:1952.9
    Units:MA

    ErAgeMa
    One sigma error of the age determination of each heating step (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:0.2
    Maximum:431.3
    Units:MA

    AgeKa
    Calculated age for each temperature step for each sample (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:604.9
    Maximum:1206.8
    Units:KA

    ErAgeKa
    One sigma error of the age determination of each heating step (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    Range of values
    Minimum:12.04
    Maximum:319.42
    Units:KA

    WeightedAverageOfJFromStandards
    J value, calculated from the weighted average of standards placed in various positions in the nuclear reactor (Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF))

    WeightedAverageOfJFromStandards value and error

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?

    Collection of all but one sample was undertaken as part of the DGGS Mineral Resources section's Council project. Three summers of field work (2003, 2004, 2006) were funded through the Alaska Airborne Geophysical/Geological Mineral Inventory Program, authorized by the Alaska State Legislature and managed by the State of Alaska, Department of Natural Resources, DGGS. Supplemental funding for field work was provided by the U.S. Geological Survey (USGS) STATEMAP program (grants 04HQPA0003 and 06HQPA0003). Studies of mineral chemistry and 21 samples for 40Ar/39Ar geochronology in the Council map area were funded by Grant 04HQGR0163 from the USGS Mineral Resources External Research Program to the University of Alaska Fairbanks (UAF) (Layer and Newberry, 2004). Samples in this report were collected by Melanie B. Werdon, David J. Szumigala, Jennifer E. Athey, and Lawrence K. Freeman of DGGS, and by Rainer J. Newberry and Shelly A. Hicks of UAF Department of Geology & Geophysics. The collection of sample 2011-SKK-MD051 was funded with qualified outer continental shelf oil and gas revenues through the Coastal Impact Assistance Program, U.S. Fish and Wildlife Service (USFWS), U.S. Department of the Interior, under USFWS Grant F12AF70098. The sample was collected by Meagan DeRaps of DGGS.

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

    Alaska Division of Geological & Geophysical Surveys
    GIS Manager
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    dggsgis@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Why was the data set created?

The Alaska Division of Geological & Geophysical Surveys (DGGS) Mineral Resources Section conducted geologic mapping and a mineral-resource evaluation on the southern Seward Peninsula, Alaska, during the summers of 2003, 2004, and 2006 as part of the state-funded Airborne Geophysical/Geological Mineral Inventory (AGGMI) Program. The DGGS airborne geophysical surveys, 1:50,000-scale surficial and bedrock geologic maps, and supporting geochemical and geochronologic data will foster a better understanding of the geology and mineral potential of the southern Seward Peninsula, Alaska. Additionally, as part of the Coastal Hazards program, the DGGS Engineering Geology Section collected a plutonic sample from Cape Denbeigh in eastern Norton Sound, Alaska.

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: 2011 (process 1 of 2)
    Fieldwork - Field geologists collected rock samples from surface outcrops. Care was taken to collect fresh, unweathered samples displaying, when possible, sufficiently large grains for mineral separate sampling.

    Date: 2011 (process 2 of 2)
    Sample preparation and analysis - Prior to submission to the laboratory for 40Ar/39Ar analysis, thin-sections of all samples (except for the Cape Denbeigh sample) were petrographically inspected to ensure that minerals selected for dating of magmatic crystallization were free of alteration, and that samples with white mica in veins had coarse enough white mica present for mineral separation. Rock samples that we found to be suitable for dating by 40Ar/39Ar geochronology analysis were submitted to the Geochronology Laboratory at the University of Alaska Fairbanks (UAF) where they were dated according to the protocols outlined in the accompanying report.

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

    Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2005, Line, gridded, and vector data, and selected plot files of the airborne geophysical survey data of the Nome mining district, Seward Peninsula, Alaska: Geophysical Report GPR 2004-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Burns, L.E., Surveys, Fugro Airborne, and Stevens Exploration Management Corp., 2003, Plot files of the airborne geophysical survey data of the Council area, Seward Peninsula, Alaska: Geophysical Report GPR 2003-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Newberry, R.J., Werdon, M.B., Athey, J.E., and Szumigala, D.J., 2005, Bedrock geologic map of the Council area, Solomon D-4 and Bendeleben A-4 quadrangles, Seward Peninsula, Alaska: Report of Investigation RI 2005-1E, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:50,000
    Newberry, R.J., Werdon, M.B., Stevens, D.S.P., Athey, J.E., and Szumigala, D.J., 2005, Geologic map of the Council Area, Solomon D-4 and Bendeleben A-4 quadrangles, Seward Peninsula, Alaska: Report of Investigation RI 2005-1D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:50,000
    Stevens, D.S.P., 2005, Surficial geologic map of the Big Hurrah area, northern half of the Solomon C-5 Quadrangle, Seward Peninsula, Alaska: Report of Investigation RI 2005-1C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:50,000
    Stevens, D.S.P., 2005, Surficial geologic map of the Council Area, Solomon D-4 and Bendeleben A-4 quadrangles, Seward Peninsula, Alaska: Report of Investigation RI 2005-1F, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:50,000
    Werdon, M.B., Newberry, R.J., Szumigala, D.J., Athey, J.E., and Hicks, S.A., 2005, Bedrock geologic map of the Big Hurrah area, northern half of the Solomon C-5 Quadrangle, Seward Peninsula, Alaska: Report of Investigation RI 2005-1B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:50,000
    Werdon, M.B., Newberry, R.J., Szumigala, D.J., Freeman, L.K., and Athey, J.E., 2007, Major-oxide, minor-oxide, trace-element, geochemical, and non-carbonate carbon data from rocks collected in the Solomon and Nome quadrangles, Seward Peninsula, Alaska in 2006: Raw Data File RDF 2007-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 49 p
    Werdon, M.B., Stevens, D.S.P., Newberry, R.J., Szumigala, D.J., Athey, J.E., and Hicks, S.A., 2005, Explanatory booklet to accompany geologic, bedrock, and surficial maps of the Big Hurrah and Council areas, Seward Peninsula, Alaska: Report of Investigation RI 2005-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 24 p
    Werdon, M.B., Stevens, D.S.P., Newberry, R.J., Szumigala, D.J., Athey, J.E., and Hicks, S.A., 2005, Geologic map of the Big Hurrah area, northern half of the Solomon C-5 Quadrangle, Seward Peninsula, Alaska: Report of Investigation RI 2005-1A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:50,000
    Werdon, M.B., Szumigala, D.J., Newberry, R.J., Athey, J.E., and Hicks, S.A., 2005, Major-oxide, minor-oxide, trace-element, geochemical, and non-carbonate carbon data from rocks collected in the Solomon, Bendeleben, and Nome quadrangles, Seward Peninsula, Alaska in 2003 and 2004: Raw Data File RDF 2005-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 46 p

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

  1. How well have the observations been checked?

    Coordinates of sample locations were determined by the geologists in the field using handheld GPS units. Sample numbers were recorded in the field on sample bags and on field note sheets. The sample location table was cross checked for consistency against the sample numbers recorded on the bags. Laboratory sample numbers were generated by the UAF geochronology, in some cases the lab numbers differ from those assigned by DGGS geologists. We provide both the lab and the DGGS sample numbers in the data tables. See text report for additional discussion of laboratory procedures. Lab results and interpretations were examined by several geologists to ensure that they are reasonable given the geologic context of the sample.

  2. How accurate are the geographic locations?

    Location coordinates (in NAD83 for the Cape Denbeigh sample, and NAD27 datum for all other samples) were collected using handheld GPS units, with a typical reported accuracy of about 10 m or less. All location coordinates were converted to latitude and longitude (NAD1983) coordinates using ArcGIS v. 10.2.2.

  3. How accurate are the heights or depths?

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

    Users should note that the interpretive summaries that are provided in the text report have been lightly edited for clarity but are generally provided as received from the lab.

  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 is 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. The 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)

    Alaska 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 2015-3

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no expressed 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.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 08-Jun-2015
Metadata author:
Alaska Division of Geological & Geophysical Surveys
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 2.9.21 on Mon Jun 8 10:42:40 2015