Amino-acid diagenesis and its implication for late Pleistocene lacustrine sediment, Clear Lake, California

GSA Special Papers
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Abstract

The diagenesis of amino acids in sediments from Clear Lake core CL-80-1 is indicated by changes in amino acid concentrations, compositions, and stereochemistry. Concentrations of total amino acids decrease with depth, but the decrease is not systematic, possibly reflecting a nonuniformity in sedimentary and postdepositional processes affecting the amino acids. Ratios of neutral/acidic amino acids may indicate that the pH of interstitial water is slightly alkaline to slightly acidic and that the organic matter is well humified. Ratios of nonprotein/protein amino acids suggest that some changes in amino acids with depth result from microbial degradations. The extent of racemization of alanine increases with depth; the trends of these data may be explained, in part, by rapid sedimentation within the lake. Agreement between extents of alanine racemization for sediments from equivalent depths in two cores from the lake suggests that diagenetic temperatures are uniform within the sediments of the northern basin of Clear Lake.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Amino-acid diagenesis and its implication for late Pleistocene lacustrine sediment, Clear Lake, California
Series title GSA Special Papers
DOI 10.1130/SPE214-p161
Volume 214
Year Published 1988
Language English
Publisher GSA
Contributing office(s) Pacific Coastal and Marine Science Center
Description 10 p.
Larger Work Title Late Quaternary Climate, Tectonism, and Sedimentation in Clear Lake, Northern California Coast Ranges
First page 161
Last page 170
Country United States
State California
Other Geospatial Clear Lake
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