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dc.contributor.author
Gomez, Fernando Javier  
dc.contributor.author
Mlewski, Estela Cecilia  
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Boidi, Flavia Jaquelina  
dc.contributor.author
Farias, Maria Eugenia  
dc.contributor.author
Gérard, Emmanuelle  
dc.date.available
2019-11-08T14:10:49Z  
dc.date.issued
2018-06  
dc.identifier.citation
Gomez, Fernando Javier; Mlewski, Estela Cecilia; Boidi, Flavia Jaquelina; Farias, Maria Eugenia; Gérard, Emmanuelle; Calcium carbonate precipitation in diatom-rich microbial mats: The Laguna Negra hypersaline lake, Catamarca, Argentina; Society for Sedimentary Geology; Journal of Sedimentary Research - (Print); 88; 6; 6-2018; 727-742  
dc.identifier.issn
1527-1404  
dc.identifier.uri
http://hdl.handle.net/11336/88307  
dc.description.abstract
Carbonate microbialites provide a window to understand microbe-mineral interactions in modern environments and in the geological record. Unraveling microbial versus physicochemical controls and biogeochemical signatures is not always straightforward. Environmental and laboratory studies have shown that microbial activity can play a central role in calcium carbonate precipitation. Most studies have focused on the effects of Bacteria and Archaea activity on carbonate precipitation processes (e.g., cyanobacteria, sulfate-reducing bacteria, sulfide-oxidizing bacteria and iron-reducing bacteria). The influence of eukaryotic activity, such as diatoms and other microalgae, on carbonate precipitation and microbialite formation has been the focus of less attention. This study explores carbonate mineralization in active diatom-rich microbial mats developed in a high-Altitude groundwater-fed hypersaline lake in the Puna region of Catamarca, Argentina. Previous work has focused on the texture, mineralogy, and stable-isotope chemistry of the subfossil oncoidal and laminar microbialites. Here, using 16S rDNA Bacteria diversity analysis, confocal scanning laser microscopy, scanning electron microscopy, and transmittedlight microscopy, we explore the Bacteria and diatom diversity in the microbial mats and the related carbonates textures and make comparisons with similar textures in the associated oncoidal microbialites. Diatom-rich subspherical aggregates, which have not been previously described in the literature, show a diverse microbial community with abundant exopolymeric substances (EPSs) where carbonate precipitation takes place. These aggregates are a main component of the Laguna Negra microbial mats and show anhedral micritic calcite in the EPS matrix as the main mineral component. Similar calcite micrite textures are also preserved as one lamina type in the associated oncoids. On the other hand, where EPS are absent, carbonate precipitation, related to pennate diatom blooms, is represented by euhedral aragonite needles suggesting different mechanisms and controls. Changes in the microbial communities are recorded in the oncoids as different lamina types, providing a link between the currently active mats and the subfossil oncoidal structures. This is a first survey of these previously unexplored diatom-rich microbial mats developed under extreme environmental conditions in the Laguna Negra. Understanding the effect that the interaction between diatoms and prokaryotic communities has on carbonate precipitation may provide some insight on the evolution of microbialite textures and fabrics, and on the change from prokaryote-dominated systems to mixed eukaryotic-prokaryotic systems.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Society for Sedimentary Geology  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
CALCIUM CARBONATE  
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DIATOMS  
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HYPERSALINE LAKE  
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MICROBIALITES  
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Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Calcium carbonate precipitation in diatom-rich microbial mats: The Laguna Negra hypersaline lake, Catamarca, Argentina  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-10-16T19:56:09Z  
dc.journal.volume
88  
dc.journal.number
6  
dc.journal.pagination
727-742  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Lawrence  
dc.description.fil
Fil: Gomez, Fernando Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina  
dc.description.fil
Fil: Mlewski, Estela Cecilia. Universidad Nacional de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina  
dc.description.fil
Fil: Boidi, Flavia Jaquelina. Universidad Nacional de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina  
dc.description.fil
Fil: Farias, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentina. Universidad Nacional de Córdoba; Argentina  
dc.description.fil
Fil: Gérard, Emmanuelle. Université Paris Diderot - Paris 7; Francia  
dc.journal.title
Journal of Sedimentary Research - (Print)  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.2110/jsr.2018.37  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/sepm/jsedres/article/88/6/727/534325/Calcium-Carbonate-Precipitation-in-Diatomrich