Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska

Report of Investigation 2020-7, Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska, presents interpreted bedrock geology for a portion of the northeastern Talkeetna Mountains and the eastern Alaska Range that is primarily underlain by Pennsylvanian through Triassic rocks of the Wrangellia terrane, plus structurally emplaced Jurassic through Cretaceous metasedimentary rocks that formed north and east of Wrangellia prior to its accretion to North America. It provides the geologic framework for known and potential mineral resources related to the geology of Wrangellia, including magmatic nickel-copper-cobalt-platinum group element deposits hosted by Late Triassic mafic and ultramafic intrusions, copper-silver deposits related to metamorphism of the Late Triassic Nikolai Greenstone, and copper-gold skarn deposits associated with Early Cretaceous plutonism. This map synthesizes and reinterprets multiple generations of geologic maps, geophysical surveys, geochemistry, and geochronology, plus incorporates targeted field observations by geologists from the Alaska Division of Geological & Geophysical Surveys, the University of Alaska, and the University of California, Davis. Additional discussion of the geology and mineral potential of the map area is presented in a companion report, Twelker and others (2020). The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/30469.

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Organization: State of Alaska