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dc.contributor.author
Eymard, Inès  
dc.contributor.author
Alvarez, Maria del Pilar  
dc.contributor.author
Bilmes, Andrés  
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Vasconcelos, Crisogono  
dc.contributor.author
Thomas, Camille  
dc.contributor.author
Ariztegui, Daniel  
dc.date.available
2022-05-14T01:27:07Z  
dc.date.issued
2021-12  
dc.identifier.citation
Eymard, Inès; Alvarez, Maria del Pilar; Bilmes, Andrés; Vasconcelos, Crisogono; Thomas, Camille; et al.; Evolving controls on mineralization in patagonian microbial mats and DNA sigantures; Asociación Argentina de Sedimentología; Latin american journal of sedimentology and basin analysis; 28; 2; 12-2021; 133-151  
dc.identifier.issn
1669-7316  
dc.identifier.uri
http://hdl.handle.net/11336/157559  
dc.description.abstract
In recent years resulting investigations in living microbialites have provided significant data that have been critical to disentangle the role of the various biotic and abiotic processes contributing to their development. Despite these efforts separating the impact and magnitude of these processes remain a difficult task.At present the Maquinchao Basin in northeastern Patagonia, Argentina, contains both fossil and living microbialites. Thus, the region provides a unique opportunity to investigate the impact of intrinsic and extrinsic parameters in carbonate precipitation. Early investigations (Austral summer 2011) in living microbialites concluded that organomineralization was related to both photosynthetic activity in the more surficial layer (green), and sulfate-reduction in the lower part (beige). Field investigations in the same area four years later showed that the pounds previously containing abundant active mats had dried out, and in general revealed the absence of globular structured clusters of minerals in the microbial mats. Here we present microscale investigations using optical microscopy and SEM along with the 16SrRNA gene sequence diversity, and the physico-chemical parameters of the hosting waters. They were carried out in successive seasonal samplings in November 2015, April-May 2016, August 2016, February 2017, and March 2018. All microbialite samples show regular occurrences of sulfate reducing bacteria (SRB) along with filaments of unknown origin. Carbonates are observed associated with erect filaments in shallow and active running water locations whereas the mineral phase is located below organic matter film in comparatively deeper and calmer water areas. Additionally, seasonal changes in the physico-chemical properties of the hosting waters indicate that extrinsic parameters, especially evaporation, might play a more substantial role in the precipitation of these carbonates than previously proposed. The environmental differences between 2011 and 2015 in meteorological conditions, regional volcanic activity and associated deposits in the basin are analyzed. We concluded that they are likely responsible of the decrease of the mineralization processes, and particularly those associated with photosynthetic activity. These results call for caution when interpreting the degree of biological impact on the formation of microbialites in the geological record. Local extrinsic factors might have a changeable impact over time switching mineral precipitation from biotic to abiotic and vice-versa, which can be undistinguishable in fossilized microbialites.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Asociación Argentina de Sedimentología  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
LIVING MICROBIALITES  
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ORGANOMINERALIZATION  
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ABIOTIC  
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MAQUINCHAO BASIN  
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Geociencias multidisciplinaria  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Evolving controls on mineralization in patagonian microbial mats and DNA sigantures  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2022-05-12T07:16:49Z  
dc.identifier.eissn
1851-4979  
dc.journal.volume
28  
dc.journal.number
2  
dc.journal.pagination
133-151  
dc.journal.pais
Argentina  
dc.journal.ciudad
La Plata  
dc.description.fil
Fil: Eymard, Inès. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza  
dc.description.fil
Fil: Alvarez, Maria del Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina  
dc.description.fil
Fil: Bilmes, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina  
dc.description.fil
Fil: Vasconcelos, Crisogono. Universitat Zurich; Suiza  
dc.description.fil
Fil: Thomas, Camille. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza  
dc.description.fil
Fil: Ariztegui, Daniel. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza  
dc.journal.title
Latin american journal of sedimentology and basin analysis  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/28-2-4