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    • Visible and Near Infrared (VNIR) and Short Wavelength Infrared (SWIR) Spectra of Select Altered Mafic and Ultramafic Rock Samples from the Josephine Peridotite in CA and OR, the Yukon-Tanana region in Alaska, and from the Southern Appalachians in VA, NC, SC, and GA

    Metadata Updated: September 17, 2025

    These data are laboratory reflectance measurements conducted on a suite of altered mafic and ultramafic rocks. Visible-Near InfraRed (VNIR) and Short-Wave InfraRed (SWIR) reflectance measurements were made (~0.4 – 2.5 microns) using an artificial light source connected to an Analytical Spectral Devices (ASD) spectrometer. Spectra from a total of 91 samples were measured and analyzed, representing 33 samples collected from the Josephine Peridotite in the Klamath Mountains of northern California and Southern Oregon,12 samples from the Yukon-Tanana region of Alaska, and 46 samples from various ultramafic units in the southern Appalachian Mountains of Virginia, North Carolina, South Carolina, and Georgia. For many samples, both fresh and weathered surfaces were measured. The data were obtained in support of developing alteration indices to guide critical mineral resource and carbon dioxide mineralization assessments.

    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.

    Downloads & Resources

    Dates

    Metadata Created Date September 13, 2025
    Metadata Updated Date September 17, 2025

    Metadata Source

    Harvested from DOI USGS DCAT-US

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date September 13, 2025
    Metadata Updated Date September 17, 2025
    Publisher U.S. Geological Survey
    Maintainer
    Identifier http://datainventory.doi.gov/id/dataset/usgs-68026941d4be0210cde07d8c
    Data Last Modified 2025-04-24T00:00:00Z
    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://ddi.doi.gov/usgs-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 f351d083-bc09-4204-8d51-a89bb130ccd1
    Harvest Source Id 2b80d118-ab3a-48ba-bd93-996bbacefac2
    Harvest Source Title DOI USGS DCAT-US
    Metadata Type geospatial
    Old Spatial -141.2860, 33.0990, -77.2840, 64.7140
    Source Datajson Identifier True
    Source Hash 3e3b6755023303378865118c4dcb5051f3e8ac6eff5428e33eb989e09e58016e
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -141.2860, 33.0990, -141.2860, 64.7140, -77.2840, 64.7140, -77.2840, 33.0990, -141.2860, 33.0990}

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