Publications
Listed below are publication products directly associated with the Geology, Energy & Minerals Science Center:
Filter Total Items: 1162
Refinement of the evaluation of the role of CO2 in modifying estimates of the pressure of epithermal mineralization
Pressure is the most important of the intensive parameters for relating epithermal mineralization to the geologic setting. This paper describes the limitations on pressure (and therefore depth) of mineralization that may reasonably be derived from simple observations of the behavior of fluid inclusions (i.e., the existence of ice or CO 2 clathrate on the liquidus, the amount of expansion or contra
Authors
P.B. Barton, I.-Ming Chou
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 a factor of 4–6. By analogy with the pressure chan
Authors
B. R. Lipin
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 a factor of 4–6. By analogy with the pressure chan
Authors
Bruce R. Lipin
Mineral resource assessment of the Absaroka-Beartooth study area, Custer and Gallatin national forests, Montana
No abstract available.
Authors
M. L. Zientek, J. E. Elliott
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 higher levels in the vein system, and wall rock adjacen
Authors
Nora K. Foley, Stanton W. Caddey, Craig B. Byington, David M. Vardiman
Geochemical data for selected rock samples from the Absaroka-Beartooth study area, Custer and Gallatin National Forests, Montana
No abstract available.
Authors
J. M. Hammarstrom, K.J. Gray
Revisions of stratigraphic nomenclature within the Keweenawan Supergroup of Northern Michigan. Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keweenaw Peninsula, Michigan
No abstract available.
Authors
William F. Cannon, Suzanne W. Nicholson
Contributions to commodity geology research
No abstract available.
Authors
John H. DeYoung,, Jane Marie Hammarstrom
Bedrock geology and mineral resources of the Knoxville 1° x 2° quadrangle, Tennessee, North Carolina, and South Carolina
The Knoxville 1° x 2° 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. Bedrock in the Valley and Ridge consists of unmetamorpho
Authors
Gilpin R. Robinson, Frank G. Lesure, J. I. Marlowe, Nora K. Foley, S. H. Clark
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 requires more than a single day and participants are enc
Authors
William F. Cannon, Suzanne W. Nicholson, Cheryl A. Hedgman, Laurel G. Woodruff, Klaus J. Schul
Sampling design for spatially distributed hydrogeologic and environmental processes
A methodology for the design of sampling networks over space is proposed. The methodology is based on spatial random field representations of nonhomogeneous natural processes, and on optimal spatial estimation techniques. One of the most important results of random field theory for physical sciences is its rationalization of correlations in spatial variability of natural processes. This correlatio
Authors
G. Christakos, Ricardo A. Olea
Discussion of Blundy and Holland's (1990) "Calcic amphibole equilibria and a new amphibole-plagioclase geothermometer"
[No abstract available]
Authors
J. M. Hammarstrom, E-An Zen