Publications
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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
Bulk density and magnetization measurements of samples from the Coso Range, California Bulk density and magnetization measurements of samples from the Coso Range, California
No abstract available.
Authors
Donald Plouff, William F. Isherwood, Charles R. Bacon, Wendell A. Duffield, H. Mark Van Buren
Distribution of Quaternary rhyolite domes of the Coso Range, California: implications for extent of the geothermal anomaly. Distribution of Quaternary rhyolite domes of the Coso Range, California: implications for extent of the geothermal anomaly.
38 separate domes and flows of phenocryst-poor, high-silica rhyolite of similar major element chemical composition were erupted over the past 1My from vents arranged in a crudely S-shaped array atop a granitic horst in the Coso Range, California. Most of the extrusions are probably less than about 0.3My old. The central part of the rhyolite field is characterized by high heat flow, low...
Authors
C. R. Bacon, W. A. Duffield
Potential hazards from future eruptions in the vicinity of Mount Shasta Volcano, Northern California Potential hazards from future eruptions in the vicinity of Mount Shasta Volcano, Northern California
Mount Shasta has erupted, on the average, at least once per 800 years during the last 10,000 years, and about once per 600 years during the last 4,500 years. The last known eruption occurred about 200 radiocarbon years ago. Eruptions during the last 10,000 years produced lava flows and domes on and around the flanks of Mount Shasta, and pyroclastic flows from summit and flank vents...
Authors
C. Dan Miller
The lava lakes of Kilauea The lava lakes of Kilauea
No abstract available.
Authors
D. L. Peck, Thomas L. Wright, R. Decker
Geodolite measurements of deformation near Hollister, California, 1971-1978 Geodolite measurements of deformation near Hollister, California, 1971-1978
A 24‐station trilateration network spanning the San Andreas and Calaveras faults near Hollister, California, has been surveyed each year between 1971 and 1978, inclusive. Two moderate (ML = 5) earthquakes have occurred within the network during the interval. No convincing preseismic or coseismic anomalies associated with those earthquakes have been identified. The deformation of the...
Authors
James C. Savage, W.H. Prescott, Michael Lisowski, N. King