Abundance versus rates of accumulation in fine-grained strata of the Miocene Santa Barbara Basin,California |
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| Authors: | Caroline M Isaacs |
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| Institution: | (1) U.S. Geological Survey, 345 Middlefield Road, MS 999, 94025 Menlo Park, CA |
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| Abstract: | Although best known as a deposit rich in silica and organic matter, the Miocene Monterey Formation actually had long-term
rates of silica and organic Matter accumulation equal to or lower than values in the underlying and overlying detritus-rich
formations in the Santa Barbara coastal area. The factor Mainly influencing the composition of the Monterey Formation in this
area was the slow accumulation of terrigenous debris. In contrast, with greater than average silica abundance within the Monterey
Formation probably resulted from rapid short-term silica accumulation (of hundreds to tens of thousands years duration) rather
than from especially slow accumulation of diluting debris. |
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