Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2353
Assessing Metallic Resources in Alaska
In the last two decades federal and state governments have become in creasingly preoccupied with classi fying public lands according to the uses that may be made of them. One outcome of the classifying can be a change in the land's legal status from one in which any use is tolerated to one in which only selected activities are allowed. Since such a change af fects the economic and recreational op
Authors
Donald A. Singer, A. Thomas Ovenshine
Revised geomagnetic polarity time scale for the interval 0–5 m.y. B.P.
A change in the constants used in K‐Ar dating and a significant increase in new data have made a recompilation and recomputation of data used to define the Late Cenozoic K‐Ar polarity time scale highly desirable at this time. All available data in the range 0–5 m.y. have been recalculated using the refined constants, with 354 data points in this time interval now meeting the minimum criteria for a
Authors
Edward A. Mankinen, G. Brent Dalrymple
Evidence for tectonic movement of the Las Positas Fault, Alameda County, California
No abstract available.
Authors
Darrell G. Herd, Earl E. Brabb
Proceedings of Conference VIII: Analysis of actual fault zones in bedrock: Convened under auspices of National Earthquake Hazards Reduction Program, 1-5 April 1979
No abstract available.
Authors
Robert Speed, Robert Sharp, Jack F. Evernden
Base and precious metal occurrences along the San Andreas Fault, Point Delgada, California
Previously unrecognized veins containing lead, zinc, and copper sulfide minerals at Point Delgada, Calif., are associated with late Mesozoic(?) and Tertiary volcanic and sedimentary rocks of the Franciscan assemblage. Sulfide minerals include pyrite, sphalerite, galena, and minor chalcopyrite, and galena-rich samples contain substantial amounts of silver. These minerals occur in a quartz-carbonate
Authors
Robert J. McLaughlin, D. H. Sorg, H.N. Ohlin, Chris Heropoulos
Progress on seismic zonation in the San Francisco Bay region
No abstract available.
Authors
Earl E. Brabb
Geomagnetic paleointensities by the Thelliers' method from submarine pillow basalts: Effects of seafloor weathering
Measurements of geomagnetic paleointensity using the Thelliers' double‐heating method in vacuum have been made on 10 specimens of submarine pillow basalt obtained from 7 fragments dredged from localities 700,000 years old or younger. In the magnetic minerals, the titanium/iron ratio parameter x and the cation deficiency (oxidation) parameter x were determined by X‐ray diffraction and Curie tempera
Authors
Sherman Gromme, Edward A. Mankinen, Monte Marshall, Robert S. Coe
Early Cretaceous metamorphic age of the South Fork Mountain Schist in the northern Coast Ranges of California
No abstract available.
Authors
Marvin A. Lanphere, M. Clark Blake, W. P. Irwin
Neogene basin formation in relation to plate tectonic evolution of San Andreas fault system, California
More than 90% of the known petroleum accumulations west of the San Andreas fault in California are in strata deposited in areally restricted Neogene basins that formed during a major tectonic reorganization of western California. These deep, localized Neogene basins replaced broad, regionally persistent Paleogene depositional aprons, although some of the Neogene basins in northern and central Cali
Authors
M. C. Blake, Jr., R. H. Campbell, T.W. Dibblee, D. G. Howell, Tor H. Nilsen, W. R. Normark, J.G. Vedder, E. A. Silver
Apollo over the Moon: A view from orbit
No abstract available.
Authors
Harold Masursky, G. W. Colton, Farouk El-Baz, Frederick J. Doyle, Richard E. Eggleton, Maurice J. Grolier, James W. Head, Carroll Ann Hodges, Keith A. Howard, Leon J. Kosofsky, Baerbel K. Lucchitta, Michael C. McEwen, Henry J. Moore, Gerald G. Schaber, David H. Scott, Laurence A. Soderblom, Mareta West, D.E. Wilhems