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This report presents 40Ar/39Ar step-heating geochronology results for igneous and metamorphic rocks from the Alaska Division of Geological & Geophysical Surveys' (DGGS) Wrangellia Mineral Assessment project, part of a multi-year effort focusing on improving the publicly available geoscientific information for the western Wrangellia terrane. The samples described in this report were selected and analyzed to improve our understanding of the geology and structural history of the Wrangellia Mineral Assessment project area. A metagabbro rock sample returned a Late Triassic crystallization age consistent with regional ages for Nikolai Greenstone-related magmatism; however, the two amphibole separates ages do not overlap,...


    map background search result map search result map 40Ar/39Ar data from rocks collected in the 2015 Wrangellia mineral assessment project area, Mount Hayes A-5, Mount Hayes B-6, and Talkeetna Mountains D-2 quadrangles, Alaska USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1950 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1950 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1951 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1965 40Ar/39Ar data from rocks collected in the 2015 Wrangellia mineral assessment project area, Mount Hayes A-5, Mount Hayes B-6, and Talkeetna Mountains D-2 quadrangles, Alaska USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1950 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1950 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1951 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1958 USGS 1:250000-scale Quadrangle for Talkeetna, AK 1965