Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2354
Metamorphic facies map of southeastern Alaska: Distribution, facies, and ages of regionally metamorphosed rocks
Nearly all of the bedrock in Southeastern Alaska has been metamorphosed, much of it under medium-grade conditions during metamorphic episodes that were associated with widespread plutonism. The oldest metamorphisms affected probable arc rocks near southern Prince of Wales Island and occurred during early and middle Paleozoic orogenies. The predominant period of metamorphism and associated plutonis
Authors
Cynthia Dusel-Bacon, D. A. Brew, S. L. Douglass
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
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
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 page-siz
Authors
Pamela D. Derkey, Bruce R. Johnson, Michael Carver
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
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 carefully to
Authors
Donald A. Singer, Ryoichi Kouda
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
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 sparsely
Authors
Dennis Geist, Keith A. Howard, Peter Larson
Rapid extension recorded by cooling‐age patterns and brittle deformation, Naxos, Greece
The metamorphic core complex exposed as the island of Naxos in the Aegean Sea records an unusually complete sequence of structures developed as a result of continental extension. The structures formed during Miocene rise and cooling from ductile, upper amphibolite facies and anatectic conditions to brittle near‐surface conditions beneath the Naxos detachment fault. Top‐to‐the‐north ductile fabrics
Authors
B.E. John, Keith A. Howard
Sources of the Early Cretaceous plutons in the Turtle and West Riverside Mountains, California
Ages and initial isotopic ratios of Early Cretaceous (˜100 Ma) plutons of the Cordilleran Interior in the southern Turtle and West Riverside mountains distinguish them from Late Cretaceous plutons in surrounding ranges in the eastern Mojave Desert. Furthermore, the studied plutons have isotopic and geochemical characteristics more similar to plutons of Cretaceous age in the coastal batholiths (Pen
Authors
C. M. Allen, J. L. Wooden, Keith A. Howard, D.A. Foster, R. M. Tosdal
The San Mateo County GIS project for predicting the consequences of hazardous geologic processes
No abstract available.
Authors
E. E. Brabb
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 serpentinite mel
Authors
M. Clark Blake, D.E. Moore, A. S. Jayko