Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2354
Preliminary geologic map of the Piru 7.5' quadrangle, southern California: A digital database
This Open-File report is a digital geologic map database. This pamphlet serves to introduce and describe the digital data. There is no paper map included in the Open-File report.
This digital map database is compiled from previously published sources combined with some new mapping and modifications in nomenclature. The geologic map database delineates map units that are identified by general age
Authors
R.F. Yerkes, Russell H. Campbell
Preliminary map of peak horizontal ground acceleration for the Hanshin-Awaji earthquake of January 17, 1995, Japan
No abstract available.
Authors
Carl M. Wentworth, Roger D. Borcherdt, R. K. Mark
The surface of crystalline basement, Great Valley and Sierra Nevada, California: A digital map database
Crystalline basement in central California extends westward from the exposed Sierra Nevada beneath the sedimentary fill of the Great Valley and under the eastern edge of the Coast Ranges at mid-crustal depth. The surface of this basement is defined from three types of control: in the Sierra Nevada from the topography itself, beneath the eastern two thirds of the Great Valley in considerable detail
Authors
Carl M. Wentworth, G. Reid Fisher, Paia Levine, Robert C. Jachens
The effect of acidic, metal-enriched drainage from the Wightman Fork and Alamosa River on the composition of selected wetlands in San Luis Valley, Colorado
The biogeochemistry of selected wetlands in the San Luis Valley, Colorado, was examined to assess the effect of acidic, metal-enriched water draining mineralized areas near and around the Summitville Mine. The sampling protocols, analytical methods, and chemical composition of water and stream bed sediment from the Wightman Fork and Alamosa River as well as water, surface sediment or cores, and ro
Authors
Laurie S. Balistrieri, L. P. Gough, R. C. Severson, M. R. Montour, Paul H. Briggs, B. M. Adrian, K. J. Curry, D. L. Fey, P. L. Hageman, C. S. Papp
Seismic maps foster landmark legislation
When a powerful earthquake strikes an urban region, damage concentrates not only near the quake's source. Damage can also occur many miles from the source in areas of soft ground. In recent years, scientists have developed ways to identify and map these areas of high seismic hazard. This advance has spurred pioneering legislation to reduce earthquake losses in areas of greatest hazard.
Authors
Roger D. Borcherdt, Robert B. Brown, Robert A. Page, Carl M. Wentworth, James W. Hendley
Jurassic thrusting of Precambrian basement over Paleozoic cover in the Clipper Mountains, southeastern California
The Clipper Mountains in the eastern Mojave Desert expose evidence of Jurassic plutonic intrusion along what was an active thrust at the east fringe of the exposed Cordilleran Jurassic magmatic arc. This event occurred during a period of widespread arc magmatism and intra-arc thrusting in the Cordillera related to subduction under the west edge of North America. Jurassic plutons in the eastern Moj
Authors
Keith A. Howard, K.J.W. McCaffrey, J. L. Wooden, D.A. Foster, S.E. Shaw
High-pressure amphibolite facies dynamic metamorphism and the Mesozoic tectonic evolution of an ancient continental margin, east- central Alaska
Ductilely deformed amphibolite facies tectonites comprise two adjacent terranes in east-central Alaska: the northern, structurally higher Taylor Mountain terrane and the southern, structurally lower Lake George subterrane of the Yukon-Tanana terrane. The pressure, temperature, kinematic and age data are interpreted to indicate that the metamorphism of the Taylor Mountain terrane and Lake George su
Authors
Cynthia Dusel-Bacon, V. L. Hansen, J.A. Scala
Fractal lognormal percentage assessment of porphyry copper resources
No abstract available.
Authors
R. A. Crovelli, S. B. Suslick, Donald A. Singer, R.H. Balay
World class base and precious metal deposits; a quantitative analysis
Over 62 percent of the 193,000 metric tons of gold discovered to date is located in four countries and more than 68 percent occurs in four types of mineral deposits. About 55 percent of the 1,740,000 metric tons of silver found is in four countries and 45 percent is in four types of deposits. Fifty-six percent of the 1.52 billion metric tons of discovered copper is from four countries and four typ
Authors
Donald A. Singer
Biostratigraphic constraints on formation and timing of accretion in a subduction complex: An example from the Franciscan Complex of Northern California
The determination of the total age coverage of pelagic bedded chert is particularly important in studies of ancient accretionary complexes because the time span represents the minimum travel time of an oceanic plate before accretion at an island arc or continental margin. The Yolla Bolly terrane of the Franciscan Complex consists of rare metabasalt overlain by bedded radiolarian chert which in tur
Authors
Y. Isozaki, M. Clark Blake
Paleozoic ophiolitic assemblages within the southern New England orogen of eastern Australia: Implications for growth of the Gondwana margin
Several ophiolitic assemblages occur in the southern New England orogen. The development of these rocks and their relations to the rest of the orogen have major implications for the tectonic evolution of eastern Gondwana. A major, narrow but elongate belt of Early Cambrian suprasubduction zone ophiolite crops out along and near the PeelManning Fault System and is juxtaposed against younger arc and
Authors
J.C. Aitchinson, M. Clark Blake, P.G. Flood, A. S. Jayko