Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2505
Diatom constraints on the position of the Antarctic Polar Front in the middle part of the Pliocene Diatom constraints on the position of the Antarctic Polar Front in the middle part of the Pliocene
The relative percentages of diatom taxa in 5 deep-sea cores (DSDP 266, ODP 699A, ODP 747A, ODP 751 A, and Eltanin Core 50-28) from the Southern Ocean are determined for an interval centered on 3.1 to 2.9 Ma in the middle part of the Pliocene. This climatically warm interval, which is being studied by the PRISM Project of the U.S. Geological Survey, coincides with a proposed interval of...
Authors
John A. Barron
Digital geologic map of the Coeur d'Alene district, Idaho and Montana Digital geologic map of the Coeur d'Alene district, Idaho and Montana
This report describes the contents of a digital dataset (approximately 2 MB) which consists of ARC/INFO Export format files and associated macro programs. The dataset includes a geologic map of the Coeur d'Alene district, Idaho and Montana that was digitized at a scale of 1:62,500. The dataset also includes macro programs and complete plot files for creating paper copies of the map. A...
Authors
Pamela D. Derkey, Bruce R. Johnson, Michael Carver
Status and metal content of significant metallic mineral deposits in the Pacific Northwest: A contribution to the Interior Columbia Basin Ecosystem Management Project Status and metal content of significant metallic mineral deposits in the Pacific Northwest: A contribution to the Interior Columbia Basin Ecosystem Management Project
No abstract available.
Authors
Arthur A. Bookstrom, Michael L. Zientek, Stephen E. Box, Pamela D. Derkey, James E. Elliott, David Frishman, Roger P. Ashley, Russell C. Evarts, Douglas B. Stoeser, Lorre A. Moyer, Dennis P. Cox, Steve D. Ludington
Distribution of lithostratigraphic units within the central block of Yucca Mountain, Nevada; a three-dimensional computer-based model, version YMP.R2.0 Distribution of lithostratigraphic units within the central block of Yucca Mountain, Nevada; a three-dimensional computer-based model, version YMP.R2.0
No abstract available.
Authors
D.C. Buesch, James E. Nelson, Robert P. Dickerson, Ronald M. Drake, Richard W. Spengler, Jeffrey K. Geslin, Thomas C. Moyer, Carma A. San Juan
Proposed stratigraphic nomenclature and macroscopic identification of lithostratigraphic units of the Paintbrush Group exposed at Yucca Mountain, Nevada Proposed stratigraphic nomenclature and macroscopic identification of lithostratigraphic units of the Paintbrush Group exposed at Yucca Mountain, Nevada
No abstract available.
Authors
D.C. Buesch, R. W. Spengler, T. C. Moyer, J. K. Geslin
Application of a feedforward neural network in the search for kuroko deposits in the Hokuroku District, Japan Application of a feedforward neural network in the search for kuroko deposits in the Hokuroku District, Japan
A feedforward neural network with one hidden layer and five neurons was trained to recognize the distance to kuroko mineral deposits. Average amounts per hole of pyrite, sericite, and gypsum plus anhydrite as measured by X-rays in 69 drillholes were used to train the net. Drillholes near and between the Fukazawa, Furutobe, and Shakanai mines were used. The training data were selected...
Authors
Donald A. Singer, Ryoichi Kouda
Significant metalliferous and selected non-metalliferous lode deposits and placer districts for the Russian Far East, Alaska, and the Canadian Cordillera Significant metalliferous and selected non-metalliferous lode deposits and placer districts for the Russian Far East, Alaska, and the Canadian Cordillera
No abstract available.
Authors
Warren J. Nokleberg, Thomas K. Bundtzen, Kenneth M. Dawson, Roman A. Eremin, Nikolai A. Goryachev, Richard D. Koch, Vladimir V. Ratkin, Ilya S. Rozenblum, Vladimir I. Shpikerman, Yuri F. Frolov, Mary E. Gorodinsky, Vladimir D. Melnikov, Nikolai V. Ognyanov, Eugene D. Petrachenko, Anany I. Pozdeev, Katherina V. Ross, Douglas H. Wood, Donald Grybeck, Alexander I. Khanchuk, Lidiya I. Kovbas, Ivan Ya. Nekrasov, Anatoly A. Sidorov
The generation of oceanic rhyolites by crystal fractionation: the basalt-rhyolite association at Volcán Alcedo, Galápagos archipelago The generation of oceanic rhyolites by crystal fractionation: the basalt-rhyolite association at Volcán Alcedo, Galápagos archipelago
Alcedo volcano is one of six shield volcanoes on Isabela Island in the western Galápagos Islands. Although Alcedo is dominantiy basaltic, it is unusual in that it also has erupted ∼1 km3 of rhyolite. The rhyolitic phase marked a 10-fold decrease in the mass-eruption rate of the volcano, and the volcano has returned to erupting basalt. The basalts are tholeiitic and range from strongly to...
Authors
Dennis Geist, Keith A. Howard, Peter Larson
The importance of geology in understanding and remediating environmental problems at Summitville The importance of geology in understanding and remediating environmental problems at Summitville
No abstract available.
Authors
Geoffrey S. Plumlee, John E. Gray, M. M. Roeber, Mark F. Coolbaugh, Marta J. Flohr, Gene Whitney
The role of serpentinite melanges in the unroofing of UHPM rocks: An example from the Western Alps of Italy: Chapter 6 The role of serpentinite melanges in the unroofing of UHPM rocks: An example from the Western Alps of Italy: Chapter 6
The ultrahigh pressure metamorphic rocks (UHPM) of the Dora-Maira continental massif are overlain by a stack of oceanic nappes. Metamorphic grade appears to increase downward but with marked discontinuities between each of the nappes, suggesting that section has been removed along the bounding faults. This apparent omission of section is greatest in the lowest oceanic unit where a...
Authors
M. Clark Blake, D.E. Moore, A. S. Jayko
Geochemical processes controlling acid-drainage generation and cyanide degradation at Summitville Geochemical processes controlling acid-drainage generation and cyanide degradation at Summitville
No abstract available.
Authors
Geoffrey S. Plumlee, Kathleen S. Smith, Elwin L. Mosier, Walter H. Ficklin, Maria R. Montour, Paul Briggs, Allen L. Meier