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    • Location Data for Petrographic Samples and Isotopic and Age Data from Detrital Zircon Grains from Selected Rock Samples from St. Lawrence Island and the Western Brooks Range, Alaska

    Metadata Updated: July 6, 2024

    This data set contains a list of geologic station localities on St. Lawrence Island, Alaska, from which thin section samples were examined. The data set also contains U-Pb isotopic data and ages of detrital zircon (DZ) from sedimentary rocks collected on St. Lawrence Island and in the western Brooks Range. All St. Lawrence Island samples (DZ and thin sections) were collected by U.S. Geological Survey (USGS) geologists during geologic mapping in the 1970s. DZ samples from the Brooks Range were collected as part of regional geological mapping programs by the USGS and the Alaska Division of Geological and Geophysical Surveys. Detrital zircon grains were obtained from samples of sedimentary rocks to determine depositional age and sediment sources. The data tables accompanying this data release report the isotopic composition of uranium (U) and thorium (Th) measured in each grain, ratios of two isotopes of lead (207Pb and 206Pb) and two isotopes of uranium (235U and 238U), and the age of each grain.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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    Dates

    Metadata Created Date June 1, 2023
    Metadata Updated Date July 6, 2024

    Metadata Source

    Harvested from DOI EDI

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date June 1, 2023
    Metadata Updated Date July 6, 2024
    Publisher U.S. Geological Survey
    Maintainer
    @Id http://datainventory.doi.gov/id/dataset/ae5d7e4ab9f98c68a4147bb6679e4d6c
    Identifier USGS:ASC459
    Data Last Modified 20220429
    Category geospatial
    Public Access Level public
    Bureau Code 010:12
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://datainventory.doi.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id e1acb69e-1482-4ed5-8530-3fc2d68ff5c2
    Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
    Harvest Source Title DOI EDI
    Metadata Type geospatial
    Old Spatial -171.5,63.1,-158.5,68.65
    Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
    Source Datajson Identifier True
    Source Hash 42cc71a2cf8c381591b66cee327dd1a9c5e12088563ca3327ead5bfd0ccbb1ff
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -171.5, 63.1, -171.5, 68.65, -158.5, 68.65, -158.5, 63.1, -171.5, 63.1}

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