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40Ar/39Ar data, Styx River map area, Lime Hills C-1 Quadrangle, Alaska


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2014-12-05 12:42:00


Benowitz, J.A., Layer, P.W., and Sicard, K.R., 2014, 40Ar/39Ar data, Styx River map area, Lime Hills C-1 Quadrangle, Alaska: Alaska Division of Geological & Geophysical Surveys,


This DGGS Raw Data File presents 40Ar/39Ar age dating results for selected igneous rocks encountered in the Styx River area of the western Alaska Range. Crystallization ages on biotite and hornblende from plutonic rocks range from about ~60 to ~63 Ma, while a sericite alteration age in plutonic rocks altered by a dike swarm also is around ~63 Ma. Sericite alteration associated with a copper-molybdenum porphyry ranges from ~10 to ~11 Ma. Analyses were performed by the University of Alaska Fairbanks Geochronology Laboratory, and results were reported by Paul Layer and Jeff Benowitz. This data release includes the following products: a summary of sample collection methods, the laboratory report, analytical data tables and associated metadata, [...]


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We selected samples for 40Ar/39Ar analysis to characterize and distinguish plutonic complexes and mineralization events, and to unravel the magmatic, structural, and metallogenic evolution of the area. The study area was selected primarily because it was located in the survey tracts with the largest number of plutons and volcanic rocks according to previous regional geologic mapping.

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