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

David J. Blunt and Keith A. Kvenvolden
Amino-acid diagenesis and its implication for late Pleistocene lacustrine sediment, Clear Lake, California (in Late Quaternary climate, tectonism, and sedimentation in Clear Lake, Northern California Coast Ranges, John D. Sims (editor))
Special Paper - Geological Society of America (1988) 214: 161-170

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-humidified. 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. (See also W89-10137) (Author 's abstract)


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 214
Title: Amino-acid diagenesis and its implication for late Pleistocene lacustrine sediment, Clear Lake, California
Title: Late Quaternary climate, tectonism, and sedimentation in Clear Lake, Northern California Coast Ranges
Author(s): Blunt, David J.Kvenvolden, Keith A.
Author(s): Sims, John D.editor
Affiliation: U. S. Geol. Surv., Menlo Park, CA, United States
Affiliation: U. S. Geol. Surv., Menlo Park, CA, United States
Pages: 161-170
Published: 1988
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2214-4
References: 44
Accession Number: 1988-068796
Categories: Quaternary geologySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
N32°30'00" - N42°00'00", W124°30'00" - W114°15'00"
N35°01'60" - N35°32'60", E135°49'60" - E136°16'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from USGS product, Selected Water Resources Abstracts, Reston, VA, United States
Update Code: 1988
Program Name: USGSOPNon-USGS publications with USGS authors
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