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Ar-Ar Age Correlation of the Elkhorn Mountain Volcanics and Base Metal Mineralization in the Ratio Mountain Quadrangle, Montana

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  • The Ratio Mountain Quadrangle is located in Southwest Montana, East of the city of Butte. This quadrangle features two major geologic units; the Elkhorn Mountain Volcanics, a series of several ignimbrites of varying composition, and the Boulder Batholith, a large granite pluton that rose through the EMV. Previous studies in the region have focused on the Boulder Batholith, while comparatively little work has been done on the Elkhorn Mountain Volcanics. The most detailed work on the EMV was produced by Prostka in the 1960’s, in which he described a series of five ignimbrite layers, underlain by a basal porphyry unit. An EDMAP grant was funded for Dr. John Dilles (OSU) during the summer of 2015 to map the EMV exposed in the Ratio Mountain Quadrangle in more detail and build on Prostka’s work from the 1960’s. The geochronology of the area is not fully understood; Dilles (OSU) and Dr. Kaleb Scarberry (Montana Bureau of Mines and Geology) have gotten two Ar-Ar ages on hornblende from mafic intrusions in the EMV, and have two mica samples from hydrothermal veins in the Boulder Batholith, but no geochronology had been conducted on the EMV prior to this year.
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  • USGS EDMAP
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