Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2543
Predicting sizes of undiscovered mineral deposits; an example using mercury deposits in California Predicting sizes of undiscovered mineral deposits; an example using mercury deposits in California
A critical part of the exploration for mineral deposits or of quantitative mineral resource assessments is the estimation of how large undiscoveredeposits might be. Typically, this problem is addressed using grade and tonnage models in which a major source of variation in possible sizes is accounted for by the differences in types of deposits (Cox and Singer, 1986; Mosier and Page, 1988...
Authors
C. F. Chung, Donald A. Singer, W. David Menzie
Impact origin of the Avak Structure, Arctic Alaska, and genesis of the Barrow gas fields Impact origin of the Avak Structure, Arctic Alaska, and genesis of the Barrow gas fields
Geophysical and subsurface geologic data suggest that the Avak structure, which underlies the Arctic Coastal Plain 12 km southeast of Barrow, Alaska, is a hypervelocity meteorite or comet impact structure. The structure is a roughly circular area of uplifted, chaotically deformed Upper Triassic to Lower Cretaceous sedimentary rocks 8 km in diameter that is bounded by a ring of...
Authors
C.E. Kirschner, Arthur Grantz, M. W. Mullen
National Earthquake Hazards Reduction Program, summaries of technical reports; Volume XXXIII National Earthquake Hazards Reduction Program, summaries of technical reports; Volume XXXIII
No abstract available.
Authors
Muriel L. Jacobson
The Conterminous United States Mineral Assessment Program: Background information to accompany folio of geologic, geochemical, geophysical, and mineral resource maps of the Ajo and Lukeville 1° by 2° quadrangles, Arizona The Conterminous United States Mineral Assessment Program: Background information to accompany folio of geologic, geochemical, geophysical, and mineral resource maps of the Ajo and Lukeville 1° by 2° quadrangles, Arizona
Encompassing about 21,000 km2 in southwestern Arizona, the Ajo and Lukeville 1° by 2° quadrangles have been the subject of mineral resource investigations utilizing field and laboratory studies in the disciplines of geology, geochemistry, geophysics, and Landsat imagery. The results of these studies are published as a folio of maps, figures, and tables, with accompanying discussions...
Authors
Floyd Gray, R. M. Tosdal, J.A. Peterson, D. P. Cox, R. J. Miller, D. P. Klein, P. K. Theobald, G. B. Haxel, M. J. Grubensky, G. L. Raines, H. N. Barton, D.A. Singer, R. G. Eppinger
A quantitative link among mineral deposit modeling, geoscience mapping, and exploration-resource assessment A quantitative link among mineral deposit modeling, geoscience mapping, and exploration-resource assessment
No abstract available.
Authors
C. F. Chung, C. W. Jefferson, D.A. Singer
The biogeochemical cycling of trace metals in the water column of Lake Sammamish, Washington: Response to seasonally anoxic conditions The biogeochemical cycling of trace metals in the water column of Lake Sammamish, Washington: Response to seasonally anoxic conditions
Total acid‐soluble and dissolved Cd, Co, Cr, Cu, Ni, Pb, and Zn concentrations in the water column of a seasonally anoxic lake (Lake Sammamish, Washington) were measured on a monthly basis during the course of a year. These data, in conjunction with Fe, Mn, sulfide, and nutrient data, are used to assess the biochemical processes controlling the distribution of trace metals in the lake...
Authors
Laurie S. Balistrieri, J.W. Murray, B. Paul
Uranium-series age estimates of corals from Quaternary marine sediments of southern Florida Uranium-series age estimates of corals from Quaternary marine sediments of southern Florida
No abstract available.
Authors
D.R. Muhs, Barney J. Szabo, L. McCartan, P.B. Maat, C. A. Bush, R. B. Halley
Aminostratigraphy and oxygen isotope stratigraphy of marine terrace deposits, Palos Verdes Hills and San Pedro areas, Los Angeles County, California Aminostratigraphy and oxygen isotope stratigraphy of marine terrace deposits, Palos Verdes Hills and San Pedro areas, Los Angeles County, California
No abstract available.
Authors
D.R. Muhs, G. H. Miller, J. F. Whelan, G. L. Kennedy
Mesozoic and Cenozoic intrusions and batholiths of the Circum-Pacific region as analogues of pre-Phanerozoic batholiths: A summary Mesozoic and Cenozoic intrusions and batholiths of the Circum-Pacific region as analogues of pre-Phanerozoic batholiths: A summary
No abstract available.
Authors
David A. Brew
A reinterpretation of the timing, position, and significance of part of the Sacramento Mountains detachment fault, southeastern California A reinterpretation of the timing, position, and significance of part of the Sacramento Mountains detachment fault, southeastern California
A contact previously considered to be part of the Sacramento Mountains detachment fault (SDF), exposed in the Sacramento Mountains metamorphic core complex, is reinterpreted as an unconformity between Tertiary rhyolite of Eagle Peak and cataclastically deformed crystalline lower-plate rocks. This reinterpretation is based on outcrop-scale topographic relief and the absence of deformation...
Authors
Carol Simpson, Janet Schweitzer, Keith A. Howard
The Marina District, San Francisco, California: Geology, history, and earthquake effects The Marina District, San Francisco, California: Geology, history, and earthquake effects
A northwest-trending valley in the bedrock surface is buried by firm Pleistocene bay clay, a dense Pleistocene sand layer, soft Holocene bay sediments, loose to dense Holocene beach and dune sands, and artificial fill that have an aggregate maximum thickness of about 90 m (300 ft). Artificial filling of a cove at the site of The Marina District proceeded gradually from the late 1860s to...
Authors
Manuel G. Bonilla