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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Globally asynchronous sulphur isotope signals require re-definition of the Great Oxidation Event

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Autor(es):
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Philippot, Pascal [1, 2] ; Avila, Janaina N. [3] ; Killingsworth, Bryan A. [4] ; Tessalina, Svetlana [5] ; Baton, Franck [1] ; Caquineau, Tom [1] ; Muller, Elodie [1] ; Pecoits, Ernesto [1, 6] ; Cartigny, Pierre [1] ; Lalonde, Stefan V. [4] ; Ireland, Trevor R. [3] ; Thomazo, Christophe [7] ; van Kranendonk, Martin J. [8] ; Busigny, Vincent [1]
Número total de Autores: 14
Afiliação do(s) autor(es):
[1] Univ Paris Diderot, Inst Phys Globe Paris, Sorbonne Paris Cite, CNRS, 1 Rue Jussieu, F-75238 Paris - France
[2] Univ Montpellier, Geosci Montpellier, CNRS, UMR 5243, F-34095 Montpellier - France
[3] Australian Natl Univ, Res Sch Earth Sci, 142 Mills Rd, Canberra, ACT 2601 - Australia
[4] European Inst Marine Studies, UMR6538, Lab Geociences Ocean, Pl Nicolas Copernic, F-29280 Plouzane - France
[5] Curtin Univ, John de Laeter Ctr Isotope Res, Fac Sci & Engn, Bld 301, GPO Box U1987, Perth, WA 6845 - Australia
[6] Uruguay Technol Univ UTEC, Dept Environm Sci, Francisco Antonio Maciel 97000, Durazno - Uruguay
[7] Univ Bourgogne Franche Comte, UMR Biogeosci UB6282, CNRS, 6 Bd Gabriel, F-21000 Dijon - France
[8] Univ New South Wales, Sch Biol Earth & Environm Sci, Kensington, NSW 2052 - Australia
Número total de Afiliações: 8
Tipo de documento: Artigo Científico
Fonte: NATURE COMMUNICATIONS; v. 9, JUN 8 2018.
Citações Web of Science: 17
Resumo

The Great Oxidation Event (GOE) has been defined as the time interval when sufficient atmospheric oxygen accumulated to prevent the generation and preservation of mass-independent fractionation of sulphur isotopes (MIF-S) in sedimentary rocks. Existing correlations suggest that the GOE was rapid and globally synchronous. Here we apply sulphur isotope analysis of diagenetic sulphides combined with U-Pb and Re-Os geochronology to document the sulphur cycle evolution in Western Australia spanning the GOE. Our data indicate that, from similar to 2.45 Gyr to beyond 2.31 Gyr, MIF-S was preserved in sulphides punctuated by several episodes of MIF-S disappearance. These results establish the MIF-S record as asynchronous between South Africa, North America and Australia, argue for regional-scale modulation of MIF-S memory effects due to oxidative weathering after the onset of the GOE, and suggest that the current paradigm of placing the GOE at 2.33-2.32 Ga based on the last occurrence of MIF-S in South Africa should be re-evaluated. (AU)

Processo FAPESP: 15/16235-2 - Evolução da vida e oxigenação da terra primitiva: uma perspectiva a partir da América do Sul
Beneficiário:Pascal Andre Marie Philippot
Linha de fomento: Auxílio à Pesquisa - Programa SPEC