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Alaska/Yukon Geophysical/Geological Reconciliation of the Yukon-Tanana Terrane

    Project Lead: James V. Jones - 907-786-7442 - jvjones@usgs.gov

    The Yukon-Tanana terrane, stretching from eastern Alaska to northern British Columbia, is a geologically complex block containing deposits of base-metal, platinum-group-element, and gold-silver-copper mineralization. Unraveling the history of this terrane is essential for assessing the extent and distribution of that mineralization and for understanding the geologic factors controlling deposit formation. However, geologic mapping in eastern Alaska is not yet adequate for this purpose, and current interpretations do not always jibe across the Alaska-Yukon border. This project brings together scientists from the USGS, the Alaska Division of Geological and Geophysical Surveys, the Yukon Geological Survey, and the Geological Survey of Canada to reconcile their differing perspectives on the geologic and geophysical data into a coherent model for the geologic evolution of the Yukon-Tanana block. This regional framework will provide a much-needed context for more focused studies and mineral exploration within the terrane.

     

    Geophysical Mapping

    All available geophysical data (primarily magnetic and gravity data) will be used to produce maps of the Yukon-Tanana terrane that show geophysical features, structures, and domains in Alaska and Yukon, Canada. These will serve as a platform for the regional geologic synthesis and integration.

     

    Geophysical/Geological Integration

    Using the new geophysical maps to facilitate cross-border geologic mapping, key units, assemblages, and structures that are present on both sides of the Alaska/Yukon border will be identified. Specific attention will be given to the following geologic puzzles:

     

    Integrated Interpretation

    The geophysical maps, targeted geological studies, and new analytical data will be used to:

     

 Mineral Resources Eastern /  Central /  Western /  Alaska /  Minerals Information
Crustal Geophysics & Geochemistry  /  Spatial Data

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