Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia
- Autores
- Pacton, Muriel; Hunger, Gabriel; Martinuzzi, Vincent; Cusminsky, Gabriela Catalina; Burdin, Beatrice; Barmettler, Kurt; Vasconcelos, Crisogono; Ariztegui, Daniel
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Living stromatolites have been mostly described within shallow marine and (hyper)saline lacustrine environments. Southernmost South America lacks detailed investigations of these (organo)sedimentary buildups, particularly in regions experiencing extreme and variable environmental conditions. Here, we report and describe living freshwater stromatolites in the Maquinchao region, north‐western Patagonia, Argentina. Fossil stromatolites characterized by globular and cauliflower shapes are also present in a continuous palaeoshoreline of a former lake at an altitude of 830 m, whereas their living counterparts only occur in the calm waters of sheltered or meandering sections of the Maquinchao River. The living stromatolites and their host waters have been sampled and studied using various chemical and microscopic techniques to better constrain the environmental versus biological factors controlling their development. Our results indicate that today stromatolites only proliferate in freshwater when Ca2+ levels are high. A microscopic inspection of the living stromatolite mat indicates stronger photosynthetic activity in the upper green layer associated with crypto/microcrystalline calcite (nanoglobules) compared to the lower beige‐white biofilm. This biofilm contains more low‐Mg calcite (rhombohedra) precipitates, which can form millimetre‐sized aggregates in the underlying anoxic layer. Although sulphate‐reducing bacteria are living in the entire mat, they appear more abundant and widely distributed in the lower beige‐white layer and are always associated with Mg calcite. Low salinity and low‐turbidity water along with microbial (photosynthetic and heterotrophic) activity are the most important factors promoting low‐Mg calcite precipitation in the Maquinchao Basin. These conditions are very different from those proposed for recently described lacustrine stromatolites at high altitude in the subtropical and tropical Andes as well as in Chilean Patagonia. Hence, all these observations in modern freshwater stromatolites show the importance of geomicrobiological studies in identifying proxies of the hydrological conditions prevailing during their formation.
Fil: Pacton, Muriel. Geological Institute; Suiza
Fil: Hunger, Gabriel. Universidad de Ginebra; Suiza
Fil: Martinuzzi, Vincent. Universidad de Ginebra; Suiza
Fil: Cusminsky, Gabriela Catalina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Burdin, Beatrice. Centre technologique des microstructures; Francia
Fil: Barmettler, Kurt. Institute of Biogeochemistry and Pollutant Dynamics; Suiza
Fil: Vasconcelos, Crisogono. Geological Institute; Suiza
Fil: Ariztegui, Daniel. Universidad de Ginebra; Suiza - Materia
-
Bacterial Fossils
Biomineralization
Extracellular Polimeric Susbtance
Freshwater Microbialite
Nanoglobules
Stromatolites - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/60886
Ver los metadatos del registro completo
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Organomineralization processes in freshwater stromatolites: a living example from eastern PatagoniaPacton, MurielHunger, GabrielMartinuzzi, VincentCusminsky, Gabriela CatalinaBurdin, BeatriceBarmettler, KurtVasconcelos, CrisogonoAriztegui, DanielBacterial FossilsBiomineralizationExtracellular Polimeric SusbtanceFreshwater MicrobialiteNanoglobulesStromatoliteshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Living stromatolites have been mostly described within shallow marine and (hyper)saline lacustrine environments. Southernmost South America lacks detailed investigations of these (organo)sedimentary buildups, particularly in regions experiencing extreme and variable environmental conditions. Here, we report and describe living freshwater stromatolites in the Maquinchao region, north‐western Patagonia, Argentina. Fossil stromatolites characterized by globular and cauliflower shapes are also present in a continuous palaeoshoreline of a former lake at an altitude of 830 m, whereas their living counterparts only occur in the calm waters of sheltered or meandering sections of the Maquinchao River. The living stromatolites and their host waters have been sampled and studied using various chemical and microscopic techniques to better constrain the environmental versus biological factors controlling their development. Our results indicate that today stromatolites only proliferate in freshwater when Ca2+ levels are high. A microscopic inspection of the living stromatolite mat indicates stronger photosynthetic activity in the upper green layer associated with crypto/microcrystalline calcite (nanoglobules) compared to the lower beige‐white biofilm. This biofilm contains more low‐Mg calcite (rhombohedra) precipitates, which can form millimetre‐sized aggregates in the underlying anoxic layer. Although sulphate‐reducing bacteria are living in the entire mat, they appear more abundant and widely distributed in the lower beige‐white layer and are always associated with Mg calcite. Low salinity and low‐turbidity water along with microbial (photosynthetic and heterotrophic) activity are the most important factors promoting low‐Mg calcite precipitation in the Maquinchao Basin. These conditions are very different from those proposed for recently described lacustrine stromatolites at high altitude in the subtropical and tropical Andes as well as in Chilean Patagonia. Hence, all these observations in modern freshwater stromatolites show the importance of geomicrobiological studies in identifying proxies of the hydrological conditions prevailing during their formation.Fil: Pacton, Muriel. Geological Institute; SuizaFil: Hunger, Gabriel. Universidad de Ginebra; SuizaFil: Martinuzzi, Vincent. Universidad de Ginebra; SuizaFil: Cusminsky, Gabriela Catalina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Burdin, Beatrice. Centre technologique des microstructures; FranciaFil: Barmettler, Kurt. Institute of Biogeochemistry and Pollutant Dynamics; SuizaFil: Vasconcelos, Crisogono. Geological Institute; SuizaFil: Ariztegui, Daniel. Universidad de Ginebra; Suizainterntional Association of Sedimentology Wiley on line Library2015-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/60886Pacton, Muriel; Hunger, Gabriel; Martinuzzi, Vincent; Cusminsky, Gabriela Catalina; Burdin, Beatrice; et al.; Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia; interntional Association of Sedimentology Wiley on line Library; The Depositional Record; 1; 2; 12-2015; 130-1462055-4877CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1002/dep2.7info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1002/dep2.7info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:36:57Zoai:ri.conicet.gov.ar:11336/60886instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:36:57.332CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia |
title |
Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia |
spellingShingle |
Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia Pacton, Muriel Bacterial Fossils Biomineralization Extracellular Polimeric Susbtance Freshwater Microbialite Nanoglobules Stromatolites |
title_short |
Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia |
title_full |
Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia |
title_fullStr |
Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia |
title_full_unstemmed |
Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia |
title_sort |
Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia |
dc.creator.none.fl_str_mv |
Pacton, Muriel Hunger, Gabriel Martinuzzi, Vincent Cusminsky, Gabriela Catalina Burdin, Beatrice Barmettler, Kurt Vasconcelos, Crisogono Ariztegui, Daniel |
author |
Pacton, Muriel |
author_facet |
Pacton, Muriel Hunger, Gabriel Martinuzzi, Vincent Cusminsky, Gabriela Catalina Burdin, Beatrice Barmettler, Kurt Vasconcelos, Crisogono Ariztegui, Daniel |
author_role |
author |
author2 |
Hunger, Gabriel Martinuzzi, Vincent Cusminsky, Gabriela Catalina Burdin, Beatrice Barmettler, Kurt Vasconcelos, Crisogono Ariztegui, Daniel |
author2_role |
author author author author author author author |
dc.subject.none.fl_str_mv |
Bacterial Fossils Biomineralization Extracellular Polimeric Susbtance Freshwater Microbialite Nanoglobules Stromatolites |
topic |
Bacterial Fossils Biomineralization Extracellular Polimeric Susbtance Freshwater Microbialite Nanoglobules Stromatolites |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Living stromatolites have been mostly described within shallow marine and (hyper)saline lacustrine environments. Southernmost South America lacks detailed investigations of these (organo)sedimentary buildups, particularly in regions experiencing extreme and variable environmental conditions. Here, we report and describe living freshwater stromatolites in the Maquinchao region, north‐western Patagonia, Argentina. Fossil stromatolites characterized by globular and cauliflower shapes are also present in a continuous palaeoshoreline of a former lake at an altitude of 830 m, whereas their living counterparts only occur in the calm waters of sheltered or meandering sections of the Maquinchao River. The living stromatolites and their host waters have been sampled and studied using various chemical and microscopic techniques to better constrain the environmental versus biological factors controlling their development. Our results indicate that today stromatolites only proliferate in freshwater when Ca2+ levels are high. A microscopic inspection of the living stromatolite mat indicates stronger photosynthetic activity in the upper green layer associated with crypto/microcrystalline calcite (nanoglobules) compared to the lower beige‐white biofilm. This biofilm contains more low‐Mg calcite (rhombohedra) precipitates, which can form millimetre‐sized aggregates in the underlying anoxic layer. Although sulphate‐reducing bacteria are living in the entire mat, they appear more abundant and widely distributed in the lower beige‐white layer and are always associated with Mg calcite. Low salinity and low‐turbidity water along with microbial (photosynthetic and heterotrophic) activity are the most important factors promoting low‐Mg calcite precipitation in the Maquinchao Basin. These conditions are very different from those proposed for recently described lacustrine stromatolites at high altitude in the subtropical and tropical Andes as well as in Chilean Patagonia. Hence, all these observations in modern freshwater stromatolites show the importance of geomicrobiological studies in identifying proxies of the hydrological conditions prevailing during their formation. Fil: Pacton, Muriel. Geological Institute; Suiza Fil: Hunger, Gabriel. Universidad de Ginebra; Suiza Fil: Martinuzzi, Vincent. Universidad de Ginebra; Suiza Fil: Cusminsky, Gabriela Catalina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina Fil: Burdin, Beatrice. Centre technologique des microstructures; Francia Fil: Barmettler, Kurt. Institute of Biogeochemistry and Pollutant Dynamics; Suiza Fil: Vasconcelos, Crisogono. Geological Institute; Suiza Fil: Ariztegui, Daniel. Universidad de Ginebra; Suiza |
description |
Living stromatolites have been mostly described within shallow marine and (hyper)saline lacustrine environments. Southernmost South America lacks detailed investigations of these (organo)sedimentary buildups, particularly in regions experiencing extreme and variable environmental conditions. Here, we report and describe living freshwater stromatolites in the Maquinchao region, north‐western Patagonia, Argentina. Fossil stromatolites characterized by globular and cauliflower shapes are also present in a continuous palaeoshoreline of a former lake at an altitude of 830 m, whereas their living counterparts only occur in the calm waters of sheltered or meandering sections of the Maquinchao River. The living stromatolites and their host waters have been sampled and studied using various chemical and microscopic techniques to better constrain the environmental versus biological factors controlling their development. Our results indicate that today stromatolites only proliferate in freshwater when Ca2+ levels are high. A microscopic inspection of the living stromatolite mat indicates stronger photosynthetic activity in the upper green layer associated with crypto/microcrystalline calcite (nanoglobules) compared to the lower beige‐white biofilm. This biofilm contains more low‐Mg calcite (rhombohedra) precipitates, which can form millimetre‐sized aggregates in the underlying anoxic layer. Although sulphate‐reducing bacteria are living in the entire mat, they appear more abundant and widely distributed in the lower beige‐white layer and are always associated with Mg calcite. Low salinity and low‐turbidity water along with microbial (photosynthetic and heterotrophic) activity are the most important factors promoting low‐Mg calcite precipitation in the Maquinchao Basin. These conditions are very different from those proposed for recently described lacustrine stromatolites at high altitude in the subtropical and tropical Andes as well as in Chilean Patagonia. Hence, all these observations in modern freshwater stromatolites show the importance of geomicrobiological studies in identifying proxies of the hydrological conditions prevailing during their formation. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-12 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/60886 Pacton, Muriel; Hunger, Gabriel; Martinuzzi, Vincent; Cusminsky, Gabriela Catalina; Burdin, Beatrice; et al.; Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia; interntional Association of Sedimentology Wiley on line Library; The Depositional Record; 1; 2; 12-2015; 130-146 2055-4877 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/60886 |
identifier_str_mv |
Pacton, Muriel; Hunger, Gabriel; Martinuzzi, Vincent; Cusminsky, Gabriela Catalina; Burdin, Beatrice; et al.; Organomineralization processes in freshwater stromatolites: a living example from eastern Patagonia; interntional Association of Sedimentology Wiley on line Library; The Depositional Record; 1; 2; 12-2015; 130-146 2055-4877 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1002/dep2.7 info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1002/dep2.7 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
interntional Association of Sedimentology Wiley on line Library |
publisher.none.fl_str_mv |
interntional Association of Sedimentology Wiley on line Library |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613161856008192 |
score |
13.070432 |