Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2386
Summary of lithologic logging of new and existing boreholes at Yucca Mountain, Nevada, August 1993 to February 1994
No abstract available.
Authors
Jeffrey K. Geslin, Thomas C. Moyer
Preliminary geologic map of the Oat Mountain 7.5' quadrangle, southern California: A digital database
This database, identified as "Preliminary Geologic Map of the Oat Mountain 7.5' Quadrangle, southern California: A Digital Database," has been approved for release and publication by the Director of the USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. This database is released on co
Authors
R.F. Yerkes, Russell H. Campbell
Impact of the lower Alamosa River water on alfalfa, southwestern San Luis Valley, Colorado: 1994 follow-up study
No abstract available.
Authors
James A. Erdman, Kathleen S. Smith
The biogeochemistry of wetlands in the San Luis Valley, Colorado: The effects of acid drainage from natural and mine sources
The Summitville Mine, located near the old mining town of Summitville in Rio Grande County, Colorado, operated between July 1986 and December 1992 as a large-tonnage open-pit heap-leach gold mine. During its 6 years of existence the trace metal levels in drainage water from the mine site were elevated over historical (pre-1986) levels (Moran and Wentz, 1974) due to input from three sources—heap le
Authors
Larry P. Gough, Laurie S. Balistrieri, F.E. Lichte, T.M. Yanosky, Ronald C. Severson, A.S. Archuleta
Preliminary geologic map of the Calabasas 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 a
Authors
R.F. Yerkes, R. H. Campbell
Evidence for a basement feature related to the Cortez disseminated gold trend and implications for regional exploration in Nevada
No abstract available.
Authors
V. J. Grauch, Robert C. Jachens, Richard J. Blakely
Crustal magnetic anomalies
This Quadrennial Report departs in format from its predecessors. Earlier reports provided brief descriptions of the entire range of topics on “crustal magnetic anomalies.” Following guidelines established by the AGU, we instead focus our discussion on only a few selected topics. Our abbreviated list of references reflects this restricted focus. A more comprehensive bibliography can be obtained fro
Authors
C.A. Raymond, Richard J. Blakely
Low-grade, M1 metamorphism of the Douglas Island Volcanics, western metamorphic belt near Juneau, Alaska
The western metamorphic belt is part of the Coast plutonic-metamorphic complex of western Canada and southeastern Alaska that developed during collision of the Alexander terrane and Gravina assemblage on the west against the Yukon Prong and Stikine terranes to the east. Deformation, metamorphism, and plutonism range from about 120 to 50 Ma. Subgreenschist to lower greenschist facies metabasalts ex
Authors
Glen R. Himmelberg, David A. Brew, Arthur B. Ford
Metamorphic and structural history of continental crust at a Mesozoic collisional margin, the Ruby terrane, central Alaska
The Ruby terrane is an elongate fragment of continental crustal rocks that is structurally overlain by thrust slices of oceanic crust. Our results from the Kokrines Hills, in the south‐central part of the Ruby terrane, demonstrate that the low‐angle schistose fabric formed under high‐P/low‐T conditions, at peak conditions of 10.8‐13.2 kbar and 425‐550° C, consistent with the rare occurrence of gla
Authors
S. M. Roeske, Cynthia Dusel-Bacon, John N. Aleinikoff, L.W. Snee, Marvin A. Lanphere
Middle Tertiary extension recorded by lacustrine fan-delta deposits, Plush Ranch Basin, western Transverse Ranges, California
The Plush Ranch Formation (upper Oligocene and lower Miocene) consists of more than 1800 m of nonmarine sedimentary and volcanic rocks that record the history of an extensional basin referred to here as the Plush Ranch basin. Distinctive depositional facies, provenance, and sediment transport directions along each basin margin suggest an asymmetric basin shape that is consistent with a half-graben
Authors
Ronald B. Cole, Richard G. Stanley
Geochemical evaluation of coal from the Tertiary Usibelli Group, Usibelli mine, Alaska, one of the lowest sulfur coals mined in the United States
The Nenana coal basin extends 240 km in length and 1.5-50 krn in width along the northern foothills of the Alaska Range in central Alaska. Located at the western end of the Nenana basin is the Usibelli Coal Mine, approximately 120 km southwest of Fairbanks. The Tertiary Usibelli Group consists of coal-bearing fluvial and lacustrine sedimentary deposits that were derived from the Yukon-Tanana Uplan
Authors
Ronald H. Affolter, Gary D. Stricker, Richard G. Stanley