40Ar/39Ar data, Seward Peninsula, Alaska

This Alaska Division of Geological & Geophysical Surveys (DGGS) Raw Data File presents 40Ar/39Ar age dating results for a volcanic whole-rock sample, selected minerals from various metamorphic rocks and igneous dikes, and white mica from both metamorphic- and hydrothermal-mineralization-related veins encountered on the southern Seward Peninsula, as well as select minerals from one plutonic rock from Cape Denbeigh, eastern Norton Sound, Alaska. Cooling ages on glaucophane, barroisite, amphibole, paragonite, and biotite from metamorphic rocks range from 84 Ma to 209 Ma. The cooling age of white mica in a possible fault zone is 144 Ma. Cooling ages on late-stage metamorphic minerals (winchite and white mica) from veins...

Tags: 40Ar/39Ar, Age Dates, Ar-Ar, Bendeleben Mountains, Bendeleben Quadrangle, All tags... Big Hurrah Mine, Bluff (Place), Cape Denbeigh, Council, Council Mining District, Geochronology, Koyuk Mining District, Mineral Resources, Nome, Nome Mining District, Nome Quadrangle, Norton Bay Quadrangle, Norton Sound, STATEMAP Project, Seward Peninsula, Solomon Quadrangle, geoscientificInformation, Fewer tags