Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2339
Paleomagnetism of Middle Tertiary volcanic rocks from the Western Cascade Series, northern California
The Western Cascade Series (WCS) is a 3.5‐km‐thick, crudely homoclinal (east dipping) calcalkaline volcanic sequence of mid‐Oligocene to early Miocene age that crops out near the southern tip of the Cascade Range in northern California. The mean direction of remanent magnetization in the WCS is D, 4.9°; I, 57.6° (N, 53; k, 14.4; α95, 5.3°). When compared to a reference direction for the North Amer
Authors
Myrl E. Beck, Russell F. Burmester, Douglas E. Craig, C. Sherman Grommé, Ray E. Wells
Geochronology of augen gneiss and related rocks, Yukon-Tanana terrane, east-central Alaska
Using several isotopic techniques, we have determined the ages of selected metamorphic rocks in the Yukon-Tanana terrane (YTT) of east-central Alaska. U-Pb zircon data from an augen gneiss body in the Big Delta quadrangle indicate that the granitoid protolith of the gneiss was intruded 341 ± 3 m.y. ago (lower intercept age). An upper intercept age of 2,136 ± 31 m.y. indicates an inherited early Pr
Authors
John N. Aleinikoff, Cynthia Dusel-Bacon, Helen L. Foster
Preliminary geologic map of Santa Cruz County, California
No abstract available.
Authors
Earl E. Brabb
Map showing the status of landslide inventory and susceptibility mapping in California
No abstract available.
Authors
Fred Taylor, E. E. Brabb
Relationship of grade, tonnage, and basement lithology in volcanic-hosted epithermal precious-and base-metal quartz-adularia-type districts
Examination of grades, tonnages, and basement rocks for 88 epithermal precious- and base-metal quartz-adularia-type districts in North, Central, and South America, and Japan reveals that the type of basement rock below the mineralized veins is useful for predicting grade and size of deposits. Epithermal districts overlying basement with salt and evaporites, or rocks with trapped sea water, have a
Authors
D.L. Mosier, Donald A. Singer, T. Sato, N. J. Page
Paleomagnetism of the Tertiary Clarno Formation of central Oregon and its significance for the tectonic history of the Pacific Northwest
The Clarno Formation, a mostly Eocene and partly early Oligocene sequence of andesitic lavas and volcaniclastic rocks, is the oldest Tertiary formation exposed in north central Oregon. Remanent magnetization directions at 46 sites in the lavas provide a paleomagnetic pole at 84°N, 278°E with a 95% confidence cone of 7°. Comparison of this pole with the North American reference pole for Eocene time
Authors
C. Sherman Grommé, Myrl E. Beck, Ray E. Wells, David C. Engebretson
Geophysics: A reversal of geomagnetic polarity
The detailed behaviour of the geomagnetic field during reversals is documented by palaeomagnetists to constrain models of the geomagnetic dynamo. Reversals are studied by measuring the magnetic remanence preserved in rocks to obtain both the direction and intensity of the ancient magnetic field.
Authors
Edward A. Mankinen
Paleomagnetism and K-Ar ages of volcanic rocks from Long Valley caldera, California
Paleomagnetic measurements and K‐Ar age determinations on volcanic rocks from Long Valley caldera, California, have enabled further refinement of eruptive activity within this large silicic volcanic center. K‐Ar age determinations show that postcaldera volcanic eruptions began 0.73 m.y. ago and continued periodically until about 50,000 years ago. The eruptions were not temporally random but tended
Authors
Edward A. Mankinen, C. Sherman Grommé, G. Brent Dalrymple, Marvin A. Lanphere, Roy A. Bailey
San Mateo County Geographic Information Systems (GIS) project
Earthquakes and ground failures in the United States cause billions of dollars of damages each year, but techniques for predicting and reducing these hazardous geologic processes remain elusive. geologists, geophysicists, hydrologists, engineers, cartographers, and computer specialists from the U.S geological Survey in Menlo Park, California, are working together on a project involving GIS techniq
Authors
E. E. Brabb
Southern hemisphere origin of the Cretaceous Laytonville Limestone of California
New paleomagnetic, paleontologic, and stratigraphic data from outcrops of the Laytonville Limestone (101 to 88 million years old) support a Southern Hemisphere orgin. A paleomagnetic megaconglomerate test is statistically significant and suggests magnetization at 14?? ?? 5?? south, predating Late Cretaceous to Eocene (70 to 50 million years ago) accretion. Rapid Kula plate movement or the existenc
Authors
J.A. Tarduno, M. McWilliams, W.V. Sliter, H. E. Cook, M. C. Blake, I. Premoli-Silva
Age and tectonics of plutonic belts in accreted terranes of the Klamath Mountains, California and Oregon
No abstract available.
Authors
W. P. Irwin
Equivalent radiolarian ages from ophiolitic terranes of Cyprus and Oman
Radiolarian biostratigraphy shows that umberiferous strata overlying the Troodos ophiolite in Cyprus are Turonian in age and are thus essentially contemporaneous with similar strata that overlie the Samail ophiolite in Oman. However, this radiolarian age is markedly older than Campanian isotopic ages measured on the underlying rocks of the Troodos ophiolite. The revised age for the umbers indicate
Authors
Charles D. Blome, William P. Irwin