Monterey Fan: Growth pattern control by basin morphology and changing sea levels |
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| Authors: | William R Normark C E Gutmacher T E Chase and Pat Wilde |
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| Institution: | (1) U.S. Geological Survey, 345 Middlefield Road, 94025 Menlo Park, CA;(2) Marine Sciences Group, Department of Paleontology, University of California, 94720 Berkeley, CA |
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| Abstract: | Monterey Fan is the largest modern fan off the California shore. Two main submarine canyon systems feed it via a complex pattern
of fan valleys and channels. The northern Ascension Canyon system is relatively inactive during high sea-level periods. In
contrast, Monterey Canyon and its tributaries to the south cut across the shelf and remain active during high sea level. Deposition
on the upper fan is controlled primarily by the relative activity within these two canyon systems. Deposition over the rest
of the fan is controlled by the oceanic crust topography, resulting in an irregular fan shape and periodic major shifts in
the locus of deposition.
Margin setting represents fan and/or source area |
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