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Formation of stromatolite lamina at the interface of oxygenic-anoxygenic photosynthesis
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Number of Authors: 142018 (English)In: Geobiology, ISSN 1472-4677, E-ISSN 1472-4669, Vol. 16, no 4, p. 378-398Article in journal (Refereed) Published
Abstract [en]

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 (<18months) 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.

Place, publisher, year, edition, pages
2018. Vol. 16, no 4, p. 378-398
Keywords [en]
anoxygenic photosynthesis, oxygenic photosynthesis, stromatolite
National Category
Biological Sciences Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-157631DOI: 10.1111/gbi.12281ISI: 000434965600004PubMedID: 29573198OAI: oai:DiVA.org:su-157631DiVA, id: diva2:1228524
Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-06-28Bibliographically approved

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Bourillot, R.Dupraz, Christophe
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