Publications
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Trace-element variations at Summer Coon volcano, San Juan Mountains, Colorado, and the origin of continental-interior andesite
The Oligocene Summer Coon center, an eroded continental-interior volcano of the eastern San Juan Mountains, Colorado, was the source of magmas ranging in composition from basaltic andesite to rhyolite. Previous Pb and Sr isotope studies indicate derivation of the magmas from an isotopically homogeneous source. This study presents new data for rare-earth elements (REE), U, Th, Ba, Sr, Rb, and Ni fr
Authors
Robert A. Zielinski, Peter W. Lipman
Preliminary report on the 17th cruise of the Dimitri Mendeleev
No abstract available.
Authors
E. H. Brown, R. G. Coleman, L.M. Echiverria, R.L. Fisher, W. P. Irwin
The four Jurassic belts of northern California and their significance to the geology of the southern California borderland
No abstract available.
Authors
D. L. Jones, M. Clark Blake, C. Rangin
Recent and ancient sedimentary environments in Alaska
No abstract available.
Authors
T. H. Nilsen, E. E. Brabb, T.R. Simoni
Report on Mediterranean Neogene Congress in Bratislava, Czechoslovakia
No abstract available.
Authors
E. E. Brabb
Norms for bid distributions in sealed tender markets: An approach through simmulation
A substantial number of economic transactions occur through competition in which agents participate by submitting sealed bids.
Authors
Emil D. Attanasi, S.R. Johnson
Water quality management and the distribution of emission rights by sealed tender markets
No abstract available.
Authors
Emil D. Attanasi
Audio-magnetotelluric methods in reconnaissance geothermal exploration
An audio-magnetotelluric (AMT) system has been developed by the U.S. Geological Survey for low-cost reconnaissance exploration of geothermal regions. This is an electromagnetic sounding technique in which the scalar or Cagniard resistivity is computed at 12 frequencies logarithmically spaced from 7.5 to 18 600 Hz. Our system uses natural source fields except at the two upper frequencies of 10 200
Authors
D. B. Hoover, C. L. Long
Gravity and magnetic studies of the Geysers-Clear Lake geothermal region, California, USA
Gravity and magnetic fields in The Geysers-Clear Lake region are interpreted in relation to the known geology and other available geophysical data. New gravity data provide additional detail with the area of geothermal steam production. Computer techniques were used for removal of the regional gravity field, anomaly enhancement, and modeling subsurface structures. The gravity field was separated i
Authors
William F. Isherwood
A geochemical study of oil in metalliferous veins, Idarado Mine, San Juan Mountains, Colorado
A tarry, benzene-soluble material is present in metal-rich veins in the Idarado mine, Ouray County, Colo., in an area not known to have petroleum resources. The material was compared chemically, spectometrically, and chromatographically with oils from four fields in the nearby Paradox basin. Each of these oil fields contains reservoir rocks equivalent to rock units known to extend beneath volcanic
Authors
Peter M. Gerrild
Tectonic framework of petroliferous rocks in Alaska: hydrocarbons
Alaska, which contains about 28% of the land and continental shelf of the United States, is estimated by the U.S. Geological Survey to contain about one third of the nation's undiscovered oil and about one sixth of its undiscovered natural gas. The Survey estimates that fields discovered in Alaska through 1972 ultimately may produce about 26 billion bbl of oil and 68 Tcf of natural gas. In norther
Authors
Arthur Grantz, C.E. Kirschner