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Petrology, geochronology, and chemical evolution of the Twin Peaks Rhyolite Domes, Utah

Description: Two distinct sequences of silicic volcanism at the Twin Peaks volcanic field, Millard County, Utah, spanned periods from 2.74 +- .10 to 2.54 +- .09 m.y. and 2.43 +- .08 to 2.35 +- .08 m.y., and produced a total exposed volume of 4 km/sup 3/ of rhyolites and volcanoclastics. Wet chemical, x-ray fluorescence, microprobe, atomic absorption, and neutron activation methods have been employed to obtain a wide range of chemical data on whole rock and mineral separate samples. Calculated distribution c… more
Date: May 1, 1980
Creator: Crecraft, H. R.; Nash, W. P. & Evans, S. H., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evolution of the quaternary magmatic system, Mineral Mountains, Utah: Interpretations from chemical and experimental modeling

Description: The evolution of silicic magmas in the upper crust is characterized by the establishment of chemical and thermal gradients in the upper portion of magma chambers. The chemical changes observed in rhyolite magmas erupted over a period of 300,000 years in the Mineral Mountains are similar to those recorded at Twin Peaks, Utah, and in the spatially zoned Bishop Tuff from Long Valley, California. Chemical and fluid dynamic models indicate that cooling of a silicic magma body from the top and sides … more
Date: September 1, 1982
Creator: Nash, W. P. & Crecraft, H. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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