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Filter Total Items: 945
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Year Published: 1994

The computer model Hydrotherm, a three-dimensional finite-difference model to simulate ground-water flow and heat transport in the temperature range of 0 to 1,200 degrees C

Quantitative modeling of the deep parts of magmatic- hydrothermal systems has been limited by the lack of publicly available, documented computer models for multiphase, high-temperature flow. This report documents HYDROTHERM, a finite-difference model for three-dimensional, multiphase flow of pure water and heat over a temperature range of 0 to 1,...

Hayba, D.O.; Ingebritsen, S.E.
The computer model Hydrotherm, a three-dimensional finite-difference model to simulate ground-water flow and heat transport in the temperature range of 0 to 1,200 degrees C; 1994; WRI; 94-4045; Hayba, D. O.; Ingebritsen, S. E.

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Year Published: 1993

Small fields in the National Oil and Gas Assessment

In the 1989 National Oil and Gas Assessment prepared by the U.S. Geological Survey (USGS) and the Minerals Management Service, undiscovered oil and gas resources in small fields were assessed separately from resources in fields containing more than 1 million bbl of oil equivalent. This paper concerns the USGS Part of the study: onshore and state...

Root, David H.; Attanasi, E.D.

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Year Published: 1993

Geochemical data for selected rock samples from the Absaroka-Beartooth study area, Custer and Gallatin National Forests, Montana

Hammarstrom, J.M.; Gray, K.J.
Geochemical data for selected rock samples from the Absaroka-Beartooth study area, Custer and Gallatin National Forests, Montana; 1993; OFR; 93-505; Hammarstrom, J. M.; Gray, K. J.

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Year Published: 1993

Mineral resource assessment of the Absaroka-Beartooth study area, Custer and Gallatin national forests, Montana

Hammarstrom, J.M.; Zientek, M.L.; Elliott, J.E.
Mineral resource assessment of the Absaroka-Beartooth study area, Custer and Gallatin national forests, Montana; 1993; OFR; 93-207; edited by Hammarstrom, J. M.; Zientek, M. L.; Elliott, J. E.

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Year Published: 1993

Mineralogy, mineral chemistry, and paragenesis of gold, silver, and base-metal ores of the North Amethyst vein system, San Juan Mountains, Mineral County, Colorado

Gold-rich adularia-sericite-type mineralization occurs near the southern margin of the San Luis caldera, at the intersection of the Equity fault and the northern extension of the Amethyst fault system. Mineralized rock is confined primarily to steeply dipping structures in silicified rhyolite and dacite. Intense sericitic alteration occurs at...

Foley, Nora K.; Caddey, Stanton W.; Byington, Craig B.; Vardiman, David M.
Mineralogy, mineral chemistry, and paragenesis of gold, silver, and base-metal ores of the North Amethyst vein system, San Juan Mountains, Mineral County, Colorado; 1993; PP; 1537; Foley, N. K.; Caddey, S. W.; Byington, C. B.; Vardiman, D. M.

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Year Published: 1993

Economics and the national oil and gas assessment: The case of onshore northern Alaska

The National Oil and Gas Assessment of undiscovered recoverable conventional oil and gas resources assigned nearly 36% of the undiscovered U.S. onshore oil resources and 28% of the commercially developable undiscovered oil resources to onshore northern Alaska. Economic screening models were applied to the geologic play assessment to estimate the...

Attanasi, Emil D.; Bird, Kenneth J.; Mast, R.F.

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Year Published: 1993

Pressure increases, the formation of chromite seams, and the development of the ultramafic series in the Stillwater Complex, Montana

This paper explores the hypothesis that chromate seams in the Stillwater Complex formed in response to periodic increases in total pressure in the chamber. Total pressure increased because of the positive ??V of nucleation of CO2 bubbles in the melt and their subsequent rise through the magma chamber, during which the bubbles increased in volume...

Lipin, B.R.
Pressure increases, the formation of chromite seams, and the development of the ultramafic series in the Stillwater Complex, Montana; 1993; Article; Journal; Journal of Petrology; Lipin, B. R.

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Year Published: 1993

Pressure increases, the for­mation of chromite seams, and the development of the ultramafic series in the Stillwater Complex, Montana

This paper explores the hypothesis that chromite seams in the Stillwater Complex formed in response to periodic increases in total pressure in the chamber. Total pressure increased because of the positive δV of nucleation of CO2 bubbles in the melt and their subsequent rise through the magma chamber, during which the bubbles increased in volume by...

Lipin, Bruce R.

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Year Published: 1992

Geology of Keweenawan Supergroup Rocks near the Porcupine Mountains, Ontonagon and Gogebic Counties, Michigan

This field trip examines the geology of rocks of the Keweenawan Supergroup (1 .1 Ga) and related intrusive rocks of the Midcontinent rift system (MRS) in the western part of the northern peninsula of Michigan. The combination of stops includes all formations of the Keweenawan Supergroup in this region. Examination of all described localities...

Cannon, William F.; Nicholson, Suzanne W.; Hedgman, Cheryl A.; Woodruff, Laurel G.; Schul, Klaus J.

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Year Published: 1992

Bedrock geology and mineral resources of the Knoxville 1°x2° quadrangle, Tennessee, North Carolina, and South Carolina

The Knoxville 1°X2° quadrangle spans the Southern Blue Ridge physiographic province at its widest point from eastern Tennessee across western North Carolina to the northwest corner of South Carolina. The quadrangle also contains small parts of the Valley and Ridge province in Tennessee and the Piedmont province in North and South Carolina...

Robinson, Gilpin R.; Lesure, Frank G.; Marlowe, J.I.; Foley, Nora K.; Clark, S.H.
Bedrock geology and mineral resources of the Knoxville 1 degree x 2 degrees quadrangle, Tennessee, North Carolina, and South Carolina; 1992; B; 1979; Robinson, G. R.; Lesure, F. G.; Marlowe, J. I.; Foley, N. K.; Clark, S. H.

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Year Published: 1992

Contributions to commodity geology research

DeYoung,, John H.; Hammarstrom, Jane Marie
Contributions to commodity geology research; 1992; B; 1877; Edited by DeYoung, John H., Jr.; Hammarstrom, Jane Marie.

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Year Published: 1992

Discussion of Blundy and Holland's (1990) "Calcic amphibole equilibria and a new amphibole-plagioclase geothermometer"

[No abstract available]

Hammarstrom, J.M.; Zen, E.-A.
Discussion of Blundy and Holland's (1990) "Calcic amphibole equilibria and a new amphibole-plagioclase geothermometer"; 1992; Article; Journal; Contributions to Mineralogy and Petrology; Hammarstrom, J. M.; Zen, E. -a.