6533b86cfe1ef96bd12c82e8

RESEARCH PRODUCT

Geochemical evidence for arsenic cycling in living microbialites of a High Altitude Andean Lake (Laguna Diamante, Argentina)

Alexander E. S. Van DriesscheAndrea SomogyiAntoine BergamaschiKadda MedjoubiMaria Sancho-tomásPascal PhilippotPascal PhilippotManuel ContrerasPieter T. VisscherPieter T. VisscherEmmanuelle GérardMaria Eugenia Farias

subject

Carbonate010504 meteorology & atmospheric sciencesSynchrotron-based X-ray imagingchemistry.chemical_element010502 geochemistry & geophysicsGeologic record01 natural sciencesEarly lifechemistry.chemical_compoundPrecambrian[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/GeochemistryANDES LAKESGeochemistry and PetrologyExtremophileEcosystemArsenic cyclingArsenic0105 earth and related environmental sciencesEXTREMOPHILEEcologyMicrobialitesOtras Ciencias Naturales y ExactasGeologyARCHEAEEarly Earthchemistry13. Climate actionCarbonateCalciumARSENICCyclingCIENCIAS NATURALES Y EXACTASGeology

description

Arsenic is best known as an environmental toxin, but this element could also serve as a metabolic energy source to certain microorganisms. Moreover, As cycling may have driven microbial life on early Earth prior to oxygenation of the atmosphere. Still, little is known about the arsenic cycling processes occurring in the presence of microorganisms and the possible traces that could be preserved in the rock record. To advance our understanding of this we studied the geochemical proxies of microbial As metabolism in living microbialites from Laguna Diamante, a likely Precambrian ecosystem analogue (Catamarca, Argentina). In this study, we show that the coexistence of As(III) and As(V) strongly supports the presence of active microbially arsenic cycling in these microbialites. In addition, we propose a model by which arsenic metabolic processes can be preserved and interpreted as biosignatures in modern systems as well as in the rock record. Fil: Sancho Tomas, María. Institut de Physique Du Globe de Paris; Francia Fil: Somogyi, Andrea. Synchrotron Soleil; Francia Fil: Medjoub, Kadda. Synchrotron Soleil; Francia Fil: Bergamaschi, Antoine. Synchrotron Soleil; Francia Fil: Visscher, Pieter T.. Université de Bourgogne Franche-Comté; Francia. Centre National de la Recherche Scientifique; Francia Fil: van Driessche, Alexander E. S.. Universite Grenoble Alpes.; Francia. Centre National de la Recherche Scientifique; Francia Fil: Gérard, Emmanuelle. Institut de Physique Du Globe de Paris; Francia. Centre National de la Recherche Scientifique; Francia Fil: Farias, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentina Fil: Contreras, Manuel. Centro Ecologia Aplicada; Chile Fil: Philippot, Pascal. Université de Montpellier; Francia. Centre National de la Recherche Scientifique; Francia

yearjournalcountryeditionlanguage
2020-09-05Chemical Geology
https://doi.org/10.1016/j.chemgeo.2020.119681