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Isotopic fingerprints of microbial respiration in aragonite from Bahamian stromatolites

Miriam S. Andres, Dawn Y. Sumner, R. Pamela Reid and Peter K. Swart
Isotopic fingerprints of microbial respiration in aragonite from Bahamian stromatolites
Geology (Boulder) (November 2006) 34 (11): 973-976

Abstract

Authigenic aragonite preserves a carbon isotopic record of heterotrophic microbial influences on dissolved inorganic carbon (DIC) in microenvironments within shallow subtidal stromatolites from Highborne Cay, Bahamas. A greater amount of aragonite precipitates when and where respiration, rather than photosynthesis, influences local DIC, which is consistent with sulfate reduction promoting carbonate precipitation and calcium release during decay of exopolymeric substances. Thus, heterotrophs play a more direct role than phototrophs in stromatolite lithification. Cyanobacteria are spatially associated with aragonite containing heterotrophic isotopic signatures. Hence, the absence of an autotrophic isotopic signature in the rock record does not imply the absence of photosynthetic organisms.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 34
Serial Issue: 11
Title: Isotopic fingerprints of microbial respiration in aragonite from Bahamian stromatolites
Affiliation: University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, United States
Pages: 973-976
Published: 200611
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 33
Accession Number: 2006-091345
Categories: Quaternary geologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N24°43'00" - N24°43'00", W76°49'00" - W76°49'00"
Secondary Affiliation: University of California at Davis, California 95616, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200651
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