Publications
Filter Total Items: 964
Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska
U-Th-Pb analyses of zircons from an ortho-augen gneiss body in the Yukon-Tanana Upland of east-central Alaska yield strong evidence for the presence of early Proterozoic material in this area. U-Pb data define a chord that intersects concordia at about 2,300 and 345 m.y. We consider two interpretations: (1) the protolith was intruded during the Proterozoic and was subsequently...
Authors
John N. Aleinikoff, Cynthia Dusel-Bacon, Helen L. Foster, Kiyoto Futa
Processed and interpreted U.S. Geological Survey seismic reflection profile and vertical seismic profiles, Niobrara County, Wyoming Processed and interpreted U.S. Geological Survey seismic reflection profile and vertical seismic profiles, Niobrara County, Wyoming
No abstract available.
Authors
Myung W. Lee, J. J. Miller, R. T. Ryder, A. H. Balch
Processed and interpreted U.S. Geological Survey seismic reflection profile and vertical seismic profile, Powder River and Carter Counties, Montana Processed and interpreted U.S. Geological Survey seismic reflection profile and vertical seismic profile, Powder River and Carter Counties, Montana
No abstract available.
Authors
John J. Miller, R. T. Ryder, A. H. Balch, Myung W. Lee
Uranium contents of glassy and devitrified andesites and dacites, Mount Mazama, Oregon Uranium contents of glassy and devitrified andesites and dacites, Mount Mazama, Oregon
By direct comparison of devitrified and granophyrically crystallized specimens with nonhydrated glassy materials from the same units, Rosholt and coworkers (Rosholt and Noble, 1969; Rosholt et al., 1971) showed that specimens of primarily crystallized but otherwise unaltered peralkaline and subalkaline rhyolite from the western United States had lost from 30 to 80 percent of the uranium...
Authors
D. C. Noble, W.I. Rose, Robert A. Zielinski
Uranium in secondary silica: A possible exploration guide Uranium in secondary silica: A possible exploration guide
Study of uraniferous silica precipitates in the Shirley Basin, Wyoming, identified areas where ancient uraniferous ground water once ponded. Chalcedony collected from and directly beneath thick accumulations of rhyolite ash contain as much as 250 ppm uranium in a pre-ash topographic low and lesser concentrations (10 to 160 ppm) elsewhere. Differences in the U concentration of chalcedony...
Authors
Robert A. Zielinski
Organic composition of some Upper Cretaceous shale, Powder River Basin, Wyoming Organic composition of some Upper Cretaceous shale, Powder River Basin, Wyoming
The lower Upper Cretaceous strata in northeastern Wyoming, which have yielded major quantities of oil and gas, were sampled at boreholes in Converse, Johnson, and Weston Counties. Cores of noncalcareous shale of largely nearshore-marine origin were obtained from the Frontier Formation and the overlying Cody Shale at depths of 3,780.6 to 3,879.9 m in Converse County, near the axis of the...
Authors
E. Allen Merewether, George E. Claypool
Comments and replies on ‘Biostratigraphy and magnetostratigraphy of Paleocene terrestrial deposits, San Juan Basin, New Mexico’: Comment Comments and replies on ‘Biostratigraphy and magnetostratigraphy of Paleocene terrestrial deposits, San Juan Basin, New Mexico’: Comment
No abstract available.
Authors
James E. Fassett
Frontier Formation and equivalent rocks in eastern Wyoming Frontier Formation and equivalent rocks in eastern Wyoming
No abstract available.
Authors
E. Allen Merewether, W. A. Cobban, E.T. Cavanaugh
Comment and reply on ‘Mapped offset on the right-lateral Kern Canyon fault, southern Sierra Nevada, California’: Reply Comment and reply on ‘Mapped offset on the right-lateral Kern Canyon fault, southern Sierra Nevada, California’: Reply
No abstract available.
Authors
James G. Moore, Edward A. du Bray
Uranium abundances and distribution in associated glassy and crystalline rhyolites of the western United States Uranium abundances and distribution in associated glassy and crystalline rhyolites of the western United States
The abundance and distribution of uranium have been determined in 11 units of rhyolitic lava and ash-flow tuff of calc-alkaline and transitional composition from the western United States in order to further evaluate the potential of rhyolitic glass as a source of uranium ores. Samples consist of coexisting obsidians, perlites, and felsites that range in age from Pleistocene to Oligocene...
Authors
Robert A. Zielinski
Uranium in waters and aquifer rocks at the Nevada Test Site, Nye County, Nevada Uranium in waters and aquifer rocks at the Nevada Test Site, Nye County, Nevada
Previous chemical, geological, and hydrological information describing the physical and chemical environment of the Nevada Test Site (a Federal reserve for the testing of nuclear explosive devices) has been combined with new radiochemical and isotope data for water and rock samples in order to explain the behavior of uranium during alteration of thick sequences of rhyolitic volcanic...
Authors
Robert A. Zielinski, John N. Rosholt
Complete Bouguer gravity maps and gravity models of the Date Creek basin and vicinity, Maricopa, Mojave, Yavapai, and Yuma Counties, Arizona Complete Bouguer gravity maps and gravity models of the Date Creek basin and vicinity, Maricopa, Mojave, Yavapai, and Yuma Counties, Arizona
No abstract available.
Authors
Jeffrey C. Wynn, James K. Otton