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.
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Tags
- 40ar/39ar
- age dates
- amphibolite
- analyses
- analyses and sampling
- analytical lab results
- analytical results
- ar-ar
- bates rapids
- batholith
- bedrock
- bedrock geology
- big delta
- bluff cabin lake
- boulder creek
- chlorite
- cottonwood creek
- delta river
- dggs
- divide creek
- early cretaceous
- early jurassic
- economic geology
- eva creek
- exploration
- feldspar
- flat creek
- fortymile river assemblage
- fourmile hill
- gabbro
- garnet
- geochronology
- geologic
- geological process
- geology
- george creek
- gold run creek
- goodpaster river
- healy lake
- healy river
- hidden lake
- hornblendite
- intrusive
- iron creek
- joseph creek
- klondike assemblage
- kyanite
- lake george assemblage
- late cretaceous
- late jurassic
- late triassic
- lenant creek
- lost lake
- michigan creek
- middle jurassic
- minton creek
- molly creek
- molybdenum
- monte cristo creek
- mount harper
- my creek
- nasina assemblage
- norvell creek
- our creek
- platinum
- progressive creek
- quartz lake
- rapid creek
- salcha river
- sand creek
- sand lake
- serpentine creek
- shaw creek
- sulfides
- summit
- tanana river
- thompson lake
- timber
- tourmaline
- tungsten
- twentyfive mile creek
- ultramafic
- uncle sam creek
- volkmar lake
- volkmar river
- white creek