40Ar/39Ar geochronology data from the Big Delta, Eagle, and Mount Hayes quadrangles, Alaska
Description
40Ar/39Ar geochronology data from the Big Delta, Eagle, and Mount Hayes quadrangles, Alaska, Raw Data File 2025-11, presents 40Ar/39Ar geochronological results from samples collected during 1:100,000-scale geologic mapping across approximately 3,100 mi² (8,000 km²) in the Big Delta, Eagle, and Mt. Hayes quadrangles, an area known for gold (Au) mineralization. A total of twenty-four 40Ar/39Ar ages are reported, including three crystallization ages from intrusive rocks, two ages from mineralized veins, one age from a skarn, and eighteen metamorphic cooling ages, comprising six from the Yukon-Tanana Terrane and twelve from parautochthonous North America. These samples were analyzed to refine our understanding of igneous rock crystallization ages, metamorphic rock exhumation history, and the timing of mineralization. These data and report are available from the DGGS website: http://doi.org/10.14509/31534.