Tag Archive for: tooele county

GEOLOGIC MAP OF THE GRANITE PEAK AND SAPPHIRE MOUNTAIN AREA, U.S. ARMY DUGWAY PROVING GROUND, TOOELE COUNTY, UTAH
Donald L. Clark, Robert F. Biek, Grant C. Willis, Kent D. Brown, Paul A. Kuehne, J. Buck Ehler, and Carl L. Ege

This area is located in west-central Utah within the eastern Basin and Range Province, near the southern margin of the Great Salt Lake Desert, and within the confines of Dugway Proving Ground.  Granite Peak consists of a granitic intrusion that is Late Jurassic in age (149 million years old).  The upper part of the intrusion was altered and intruded by numerous pegmatite dikes.  Metamorphic rocks of likely Paleozoic or Proterozoic protoliths are exposed at the far south end of the mountain.  These granitic and metamorphic rocks were exhumed during Basin and Range extension, likely from about 15 to 5 million years ago.  Sapphire Mountain is a Miocene-age rhyolite flow that erupted 8 million years ago.  Quaternary surficial map units include lacustrine, alluvial, and eolian deposits, and desert mudflats.  Three of the four primary shorelines of the Bonneville lake cycle are preserved on the mountains’ flanks.

CD (2pl., 1:24,000)

M-238……….$14.95

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OFR-539MINERALOGY AND FLUID CHEMISTRY OF SURFICIAL SEDIMENTS IN THE NEWFOUNDLAND BASIN, TOOELE AND BOX ELDER COUNTIES, UTAH
Blair F. Jones, William W. White III, Kathryn M. Conko, Daniel M. Webster, and James F. Kohler

This CD contains a 53-page report (plus 43-page appendices) that details a three-year field study of Newfoundland Basin’s shallow-brine aquifer and associated playa and lacustrine sediments. Chemical and mineralogical characterization was performed on brine and selected core samples collected from the shallow-brine aquifer and sediments intercepted by 24 boreholes and 8 sets of nested monitoring wells. Aquifer tests were also conducted on specific boreholes and monitoring wells. Ground-water-brine transport in sediments of the shallow-brine aquifer occurred mainly in the permeable sedimentary facies, and possibly in vertical fissures observed in mudflat-clay facies. TEQUIL predicted mineral-sequence plots, from simulated step-wise evaporation of pore-fluid brines from peripheral and central-basin core samples, demonstrated that near-surface pore-fluid brines (<5-foot/1.5-meter depth) were a mixture of pre-West Desert Pumping Project ground water and Great Salt Lake brine. Conversely, pore fluids from core depths ranging from 5 to nearly 7 feet (1.5 to 2.1 meters) below ground level had predicted mineral sequence plots similar to the pre-pumping ground-water brine.

CD (53 p. + 43 p. appendices)
OFR-539……..$14.95