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Publications

Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center

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Marine magnetic anomalies Marine magnetic anomalies

Marine magnetic data have been available for many years from all of the world's oceans, and their contribution to marine geophysics and geology is profound. These data, for example, have allowed charting the age of the ocean floor, reconstruction of the geologic history of the major ocean basins, development of a Cenozoic and Mesozoic timescale of geomagnetic reversals, and speculation...
Authors
Richard J. Blakely, S.C. Cande

Base and precious metal occurrences along the San Andreas Fault, Point Delgada, California 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...
Authors
Robert J. McLaughlin, D. H. Sorg, H.N. Ohlin, Chris Heropoulos

Evidence for tectonic movement of the Las Positas Fault, Alameda County, California Evidence for tectonic movement of the Las Positas Fault, Alameda County, California

On October 29, 1979, a new exposure of the Las Positas fault zone near Livermore, California, was created by excavation of a creek bank along Arroyo Seco. The face of the bank was cleaned by geologists of Lawrence Livermore Laboratory (Livermore, California) to obtain a better and more complete view of the fault. The excavation was undertaken by Lawrence Livermore Laboratory as part of a...
Authors
Darrell G. Herd, Earl E. Brabb
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