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Formation of ordered dolomite in anaerobic photosynthetic biofilms

Mirna Daye, John Higgins and Tanja Bosak
Formation of ordered dolomite in anaerobic photosynthetic biofilms
Geology (Boulder) (April 2019) Pre-Issue Publication

Abstract

Dolomite enabled the preservation of fine microbial textures in some Archean and Proterozoic marine microbialites, but has rarely done so during the Phanerozoic. Here, we report precipitation of dolomite in anoxygenic photosynthetic biofilms grown under chemical conditions relevant for Archean seawater. Ordered dolomite nucleates primarily on the surfaces of photosynthetic cells when manganese(II) is present, and nanocrystals of disordered dolomite form on exopolymeric substances in microbial cultures grown either in the dark or without manganese. Dolomite nucleation and maturation on different surfaces in photosynthetically active cultures amended with 0.1-1 mM manganese(II) enables the preservation of biofilm textures at scales larger than individual microbial cells. This provides a new model for the preservation of microbial textures by dolomite before the oxygenation of the oceanic photic zone.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: Pre-Issue Publication
Title: Formation of ordered dolomite in anaerobic photosynthetic biofilms
Affiliation: Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA, United States
Published: 20190415
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2019-038011
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019187
Illustration Description: illus.
N43°02'60" - N43°02'60", W75°58'00" - W75°58'00"
Secondary Affiliation: Princeton University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201920
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