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dc.contributor.author
Guido, Diego Martin
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dc.contributor.author
Campbell, Kathleen
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dc.date.available
2020-11-25T14:13:04Z
dc.date.issued
2019-05
dc.identifier.citation
Guido, Diego Martin; Campbell, Kathleen; Plastic silica conglomerate with an extremophile microbial matrix in a hot-water stream paleoenvironment; Mary Ann Liebert; Astrobiology; 19; 5-2019; 1433-1441
dc.identifier.issn
1531-1074
dc.identifier.uri
http://hdl.handle.net/11336/118956
dc.description.abstract
A new and unusual type of fossil, siliceous hot-spring deposit (sinter) comprising monomictic, quartzose conglomerate encrusted with silicified microbial laminates has been recognized in distal portions of Jurassic and Miocene paleo-geothermal fields of South and North America, respectively. The siliceous clasts are inferred to have originated as conduit-delivered hydrothermal silica gel, owing to their general plastic morphologies,<br />which were then locally reworked and redistributed in geothermally influenced stream paleoenvironments. Today, hot-spring-fed streams and creeks, in places with silica-armored pavements, host microbial mats coating streambeds and/or growing over, and silicifying at, stream air-water interfaces, for example, in Yellowstone National Park (USA) and Waimangu Volcanic Valley (New Zealand). However, the modern deposits do not contain the plastically deformed silica cobbles evident in Mesozoic and Cenozoic examples escribed herein. Moreover, the fossil microbial laminates of this study are relatively dense and strongly coat the silica cobbles, suggesting the mats stabilized the clasts under fully submerged and hot, high-energy conditions. Thus, this new sinter facies, typically found a few kilometers from main spring-vent areas, is a perhaps unexpected extreme <br />environment in which life took hold in hydrothermal-fluvial settings of the past, and may serve as an additional target in the search for fossil biosignatures of early Earth and possibly Mars.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Mary Ann Liebert
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
HOT SPRING
dc.subject
FLUVIAL
dc.subject
CONGLOMERATE
dc.subject
SILICA GEL
dc.subject
MICROBIAL
dc.subject
BIOSIGNATURE
dc.subject.classification
Geociencias multidisciplinaria
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Plastic silica conglomerate with an extremophile microbial matrix in a hot-water stream paleoenvironment
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-11-19T15:51:17Z
dc.journal.volume
19
dc.journal.pagination
1433-1441
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Guido, Diego Martin. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
dc.description.fil
Fil: Campbell, Kathleen. University of Auckland; Nueva Zelanda
dc.journal.title
Astrobiology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.liebertpub.com/doi/10.1089/ast.2018.1998
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1089/ast.2018.1998
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