Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2340
The ophiolitic North Fork terrane in the Salmon River region, central Klamath Mountains, California
The North Fork terrane is an assemblage of ophiolitic and other oceanic volcanic and sedimentary rocks that has been internally imbricated and folded. The ophiolitic rocks form a north-trending belt through the central part of the region and consist of a disrupted sequence of homogeneous gabbro, diabase, massive to pillowed basalt, and interleaved tectonitic harzburgite. U-Pb zircon age data on a
Authors
C.J. Ando, W. P. Irwin, D. L. Jones, J.B. Saleeby
Conodonts of the western Paleozoic and Triassic belt, Klamath Mountains, California and Oregon
Conodonts were extracted from 32 samples of limestone and 5 samples of chert obtained from the Western Paleozoic and Triassic belt of the Klamath Mountains province. Triassic conodonts were found in 17 samples, and late Paleozoic conodonts in 7 samples. Conodonts of the remaining 13 samples cannot be dated more closely than early or middle Paleozoic through Triassic. The late Paleozoic conodonts a
Authors
William P. Irwin, Bruce R. Wardlaw, T.A. Kaplan
New data on the age of Lepidocyclina in California
During the 1930's and early 1940's, controversy about the age of Lepidocyclina californica and faunas associated with it led to unreconcilable differences of opinion in the attempt to provide a standard stratigraphic framework for Cenozoic rocks of western North America. Two standards with significantly different series age assignments were provided, one based largelyon benthic foraminifers and th
Authors
E. E. Brabb, Kristen McDougall, R. Z. Poore
Magnetic models of crystalline terrane; accounting for the effect of topography
Igneous rocks commonly have large magnetic susceptibilities so that high topographic relief in crystalline terrane can produce significant anomalies in aeromagnetic surveys. Topographic anomalies are particularly significant in relatively undeformed volcanic terrane because young volcanic rocks generally have large natural remanent magnetizations as well as large susceptibilities. These anomalies
Authors
Richard J. Blakely, V. J. Grauch
Intrusive rocks and plutonic belts of southeastern Alaska, U.S.A
About 30 percent of the 175,000-km2 area of southeastern Alaska is underlain by intrusive igneous rocks. Compilation of available information on the distribution, composition, and ages of these rocks indicates the presence of six major and six minor plutonic belts.From west to east, the major belts are: the Fairweather-Baranof belt of early to mid-Tertiary granodiorite; the Muir-Chichagof belt of
Authors
David A. Brew, Robert P. Morrell
Comment and Reply on ‘Tectonic accretion and the origin of the two major metamorphic and plutonic welts in the Canadian Cordillera’: COMMENT
No abstract available.
Authors
David A. Brew, A. B. Ford
Interaction of subsurface brines with oxygenated meteoric water, Ray Point Uranium District, South Texas, USA
No abstract available.
Authors
Martin B. Goldhaber, Richard B. Wanty, J.R. Chatham, R. L. Reynolds, D. Langmuir
Studies related to the Charleston, South Carolina, earthquake of 1886 — Tectonics and seismicity
Since 1973, the U.S. Geological Survey (USGS), with support from the Nuclear Regulatory Commission, has conducted extensive investigations of the tectonic and seismic history of the Charleston, S.C., earthquake zone and surrounding areas. The goal of these investigations has been to discover the cause of the large intraplate Charleston earthquake of 1886, which dominates the record of seismicity i
Authors
David Gottfried, C. S. Annell, G. R. Byerly, Marvin A. Lanphere, Jeffrey D. Phillips, Gregory S. Gohn, Brenda B. Houser, Ray R. Schneider, Hans D. Ackermann, B. R. Yantis, John K. Costain, F. Steve Schilt, Larry Brown, Jack E. Oliver, Sidney Kaufman, Robert Morrison Hamilton, John C. Behrendt, V. James Henry, Kenneth C. Bayer, David L. Daniels, Isidore Zietz, Peter Popenoe, T. M. Chowns, C. T. Williams, Robert E. Dooley, J. Wampler, William P. Dillon, Kim D. Klitgord, Charles K. Paull, Lyle D. McGinnis, James W. Dewey, Arthur C. Tarr, Susan Rhea, Carl M. Wentworth, Marcia Mergner-Keefer, G. A. Bollinger
Map showing the status of mineral resource potential evaluation of wilderness and roadless areas, Washington
No abstract available.
Authors
William A. Lawson, Russell C. Evarts
Submarine hydrothermal metamorphism of the Del Puerto ophiolite, California
No abstract available.
Authors
Russell C. Evarts, Peter Schiffman
Studies in Tertiary stratigraphy of the California Coast Ranges
The correlation of rocks of Paleogene age in California with those in Europe has had a long and complex history that can only be highlighted here. Kleinpell (1938, p. 168-181), in his classic work defining Miocene benthic1 foraminiferal stages of California, attempted to correlate faunas of California with those of western Europe and elsewhere. He pointed out that rocks usually considered lower Mi
Summary of workshops concerning regional seismic source zones of parts of the conterminous United States, convened by the U.S. Geological Survey, 1979-1980, Golden, Colorado
Workshops were convened by the U.S. Geological Survey to obtain the latest information and concepts relative to defining seismic source zones for five regions of the United States. The zones, with some modifications, have been used in preparation of new national probabilistic ground motion hazard maps by the U.S. Geological Survey. The five regions addressed are the Great Basin, the Northern Rocky
Authors
P. C. Thenhaus, F. A. McKeown, R.C. Bucknam, D. C. Ross, R.E. Anderson, W. P. Irwin, D. P. Russ, W. H. Diment