dc.creatorGuido, Diego Martin
dc.creatorCampbell, Kathleen
dc.date.accessioned2020-11-25T14:13:04Z
dc.date.accessioned2022-10-15T06:22:01Z
dc.date.available2020-11-25T14:13:04Z
dc.date.available2022-10-15T06:22:01Z
dc.date.created2020-11-25T14:13:04Z
dc.date.issued2019-05
dc.identifierGuido, 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.identifier1531-1074
dc.identifierhttp://hdl.handle.net/11336/118956
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/4354723
dc.description.abstractA 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.languageeng
dc.publisherMary Ann Liebert
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://www.liebertpub.com/doi/10.1089/ast.2018.1998
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1089/ast.2018.1998
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectHOT SPRING
dc.subjectFLUVIAL
dc.subjectCONGLOMERATE
dc.subjectSILICA GEL
dc.subjectMICROBIAL
dc.subjectBIOSIGNATURE
dc.titlePlastic silica conglomerate with an extremophile microbial matrix in a hot-water stream paleoenvironment
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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