Publications
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Pleistocene high-silica rhyolites of the Coso volcanic field, Inyo County, California Pleistocene high-silica rhyolites of the Coso volcanic field, Inyo County, California
The high-silica rhyolite domes and lava flows of the bimodal Pleistocene part of the Coso volcanic field provide an example of the early stages of evolution of a silicic magmatic system of substantial size and longevity. Major and trace element compositions are consistent with derivation from somewhat less silicic parental material by liquid state differentiation processes in...
Authors
C. R. Bacon, R. Macdonald, R. L. Smith, P. A. Baedecker
Guides to some volcanic terranes in Washington, Idaho, Oregon, and Northern California Guides to some volcanic terranes in Washington, Idaho, Oregon, and Northern California
This guidebook arose out of a series of field trips held in conjunction with the Pacific Northwest American Geophysical Union meeting held in Bend, Oregon, September 1979. The PNAGU meeting included special volcanology sessions planned by William I. Rose, Jr., Bruce A. Nolf, amd David A. Johnston. Publication of the guidebook volume was originally planned for early 1980 by the Oregon...
Authors
David A. Johnston, Julie M. Donnelly-Nolan
Aeromagnetic map of the Mt. St. Helens area, Washington Aeromagnetic map of the Mt. St. Helens area, Washington
No abstract available.
Authors
Water Resources Division U.S. Geological Survey
Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Hughes, Kotzebue, Melozitna, Selawik, and Shungnak quadrangles, west-central Alaska, supplement to Open-file report 75-627: Part B — Lists of refe Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Hughes, Kotzebue, Melozitna, Selawik, and Shungnak quadrangles, west-central Alaska, supplement to Open-file report 75-627: Part B — Lists of refe
No abstract available.
Authors
Edward Huntington Cobb, Thomas P. Miller
Potassium-argon ages from the Mount Taylor Volcanic Field, New Mexico Potassium-argon ages from the Mount Taylor Volcanic Field, New Mexico
Fourteen new K-Ar dates for volcanic rocks of the Mount Taylor field, New Mexico, indicate that most activity occurred between 4.3 and 1.5 m.y. (million years) ago. Peak activity was at about 3.0-2.5 m.y., both on the central andesite-rhyolite shield volcano and on the surrounding alkali basalt-trachyte volcanic plateau, and occurred concurrently with an episode of NNE-trending basin...
Authors
Peter W. Lipman, Harald H. Mehnert
Late Cenozoic volcanism, geochronology, and structure of the Coso Range, Inyo County, California Late Cenozoic volcanism, geochronology, and structure of the Coso Range, Inyo County, California
The Coso Range lies at the west edge of the Great Basin, adjacent to the southern part of the Sierra Nevada. A basement complex of pre‐Cenozoic plutonic and metamorphic rocks is partly buried by ∼35 km3 of late Cenozoic volcanic rocks that were erupted during two periods, as defined by K‐Ar dating: (1) 4.0–2.5 m.y., ∼31 km3 of basalt, rhyodacite, dacite, andesite, and rhyolite, in...
Authors
Wendell A. Duffield, Charles R. Bacon, G. Brent Dalrymple
Comment and reply on ‘Comparison of Miocene provincial foraminiferal stages to coccolith zones in the California Continental Borderland’: Reply Comment and reply on ‘Comparison of Miocene provincial foraminiferal stages to coccolith zones in the California Continental Borderland’: Reply
No abstract avalable.
Authors
James K. Crouch, David Bukry
Geological and geophysical investigations and mineral resources potential of the proposed Great Rift Wilderness Area, Idaho Geological and geophysical investigations and mineral resources potential of the proposed Great Rift Wilderness Area, Idaho
No abstract available.
Authors
Mel A. Kuntz, Richard H. Lefebvre, Duane E. Champion, Lisa A. McBroome, Don R. Mabey, W. D. Stanley, H. R. Covington, James Ridenour, Ronald B. Stotelmeyer