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Formation of stromatolite lamina at the interface of oxygenic-anoxygenic photosynthesis

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doi: 10.1111/gbi.12281
Authors:Pace, A.; Bourillot, R.; Bouton, A.; Vennin, E.; Braissant, O.; Dupraz, C.; Duteil, T.; Bundeleva, I.; Patrier, P.; Galaup, S.; Yokoyama, Y.; Franceschi, M.; Virgone, A.; Visscher, P. T.
Author Affiliations:Primary:
Geomicron ressources & Environnement, Ensegid, Pessac, France
Other:
UniversiteBordeaux Montaigne, France
UniversiteBourgogne, France
University of Basel, Switzerland
Stockholm University, Sweden
Universitede Poitiers, France
University of Tokyo, Japan
University of Connecticut, United States
Volume Title:Geobiology
Source:Geobiology, 16(4), p.378-398. Publisher: Wiley, Oxford, United Kingdom. ISSN: 1472-4677
Publication Date:2018
Note:In English. 80 refs.; illus., incl. 1 table, charts, geol. sketch map
Summary:In modern stromatolites, mineralization results from a complex interplay between microbial metabolisms, the organic matrix, and environmental parameters. Here, we combined biogeochemical, mineralogical, and microscopic analyses with measurements of metabolic activity to characterize the mineralization processes and products in an emergent (<18 months) hypersaline microbial mat. While the nucleation of Mg silicates is ubiquitous in the mat, the initial formation of a Ca-Mg carbonate lamina depends on (i) the creation of a high-pH interface combined with a major change in properties of the exopolymeric substances at the interface of the oxygenic and anoxygenic photoautotrophic layers and (ii) the synergy between two major players of sulfur cycle, purple sulfur bacteria, and sulfate-reducing bacteria. The repetition of this process over time combined with upward growth of the mat is a possible pathway leading to the formation of a stromatolite. Abstract Copyright (2018), John Wiley & Sons, Ltd.
Subjects:Alkaline earth metals; Biogenic structures; Calcium; Carbonates; Cycles; Geochemistry; Hypersaline environment; Laminar flow; Magnesium; Metabolism; Metals; Microbial mats; Microscope methods; Mineralization; Nucleation; Organic compounds; Oxygen; PH; Photochemistry; Photosynthesis; Sedimentary structures; Silicates; Stromatolites; Sulfur; Antilles; Caribbean region; Cuba; Greater Antilles; West Indies; Anoxygenic; Ciego de Avila
Coordinates:N220000 N220000 W0780000 W0780000
Record ID:823367-5
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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