Franciscan-type rocks off Monterey Bay,California: Implications for western boundary of Salinian Block |
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| Authors: | Henry T Mullins David K Nagel |
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| Institution: | (1) Moss Landing Marine Laboratories and San Jose State University, 95039 Moss Landing, CA;(2) Department of Geology and Moss Landing Marine Laboratories, San Jose State University, 95039 Moss Landing, CA |
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| Abstract: | Serpentinites and spilitic basalts recovered at depths of 1000 m from Ascension Submarine Canyon northwest of Monterey Bay,
California indicate that Franciscan basement is present immediately to the west of the San Gregorio Fault. This new information,
together with published geological/geophysical data, support previous suggestions that the offshore western boundary of the
Salinian block (Sur-Nacimiento Fault) has been tectonically truncated by the San Gregorio Fault and has been displaced by
as much as 90 km to the northwest since the mid-late Miocene. |
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