An evaluation of temperature scales for silica diagenesis in diatomaceous sequences including a new approach based on the Miocene Monterey Formation,California |
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| Authors: | Margaret A Keller Caroline M Isaacs |
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| Institution: | (1) U.S. Geological Survey, 345 Middlefield Road, M.S. 999, 94025 Menlo Park, CA |
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| Abstract: | Geologic relations indicate that silica phases transformed in the Monterey Formation in two zones that persist over a narrow
depth/temperature range and do not stratigraphically overlap. The wide and overlapping range of reported temperatures of these
transformations is mainly a result of the many uncertainties inherent in the different methods used to estimate temperature
and does not indicate that phases transform throughout these ranges. Our approach to a reliable temperature scale for silica
diagenesis combines as empirical zonation of silica phases with temperature calibration from a sequence at maximum temperature
and depth of burial. |
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