caa a22 4500 606149651 CHVBK 20210128100535.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00531-014-1125-3 doi (NATIONALLICENCE)springer-10.1007/s00531-014-1125-3 Geochemistry of post-extinction microbialites as a powerful tool to assess the oxygenation of shallow marine water in the immediate aftermath of the end-Permian mass extinction [Elektronische Daten] [P. Collin, S. Kershaw, N. Tribovillard, M. Forel, S. Crasquin] Rapid and profound changes in earth surface environments and biota across the Permian-Triassic boundary are well known and relate to the end-Permian mass extinction event. This major crisis is demonstrated by abrupt facies change and the development of microbialite carbonates on the shallow marine shelves around Palaeo-Tethys and western Panthalassa. Microbialites have been described from a range of sites in end-Permian and basal Triassic marine sedimentary rocks, immediately following the end-Permian mass extinction. Here, we present geochemical data primarily focused on microbialites. Our geochemical analysis shows that U, V, Mo and REE (Ce anomaly) may be used as robust redox proxies so that the microbialites record the chemistry of the ancient ambient sea water. Among the three trace metals reputed to be reliable redox proxies, one (V) is correlated here with terrigenous supply, the other two elements (U and Mo) do not show any significant authigenic enrichment, thereby indicating that oxic conditions prevailed during the growth of microbialites. REE profiles show a prominent negative Ce anomaly, also showing that the shallow marine waters were oxic. Our geochemical data are consistent with the presence of some benthic organisms (ostracods, scattered microgastropods, microbrachiopods and foraminifers) in shallow marine waters that survived the mass extinction event. Springer-Verlag Berlin Heidelberg, 2014 Permian-Triassic mass extinction nationallicence Microbialite nationallicence Rare earth elements nationallicence Trace elements nationallicence Shallow marine water nationallicence Oxygenation nationallicence Collin P. CNRS UMR 6282 Biogéosciences, Université de Bourgogne, 6 Bd Gabriel, 21000, Dijon, France aut Kershaw S. Institute for the Environment, Halsbury Building, Brunel University, Kingston Lane, UB8 3PH, Uxbridge, Middlesex, UK aut Tribovillard N. CNRS UMR 8217 Géosystèmes, Université Lille 1, Bâtiment SN5, 59655, Villeneuve d'Ascq Cedex, France aut Forel M. CR2P, MNHN-CNRS-Université Pierre and Marie Curie - Paris 06, 4 Place Jussieu, Case 104, 75005, Paris, France aut Crasquin S. CR2P, MNHN-CNRS-Université Pierre and Marie Curie - Paris 06, 4 Place Jussieu, Case 104, 75005, Paris, France aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/4(2015-06-01), 1025-1037 1437-3254 104:4<1025 2015 104 531 https://doi.org/10.1007/s00531-014-1125-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1125-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Collin P. CNRS UMR 6282 Biogéosciences, Université de Bourgogne, 6 Bd Gabriel, 21000, Dijon, France aut NATIONALLICENCE 700 1- Kershaw S. Institute for the Environment, Halsbury Building, Brunel University, Kingston Lane, UB8 3PH, Uxbridge, Middlesex, UK aut NATIONALLICENCE 700 1- Tribovillard N. CNRS UMR 8217 Géosystèmes, Université Lille 1, Bâtiment SN5, 59655, Villeneuve d'Ascq Cedex, France aut NATIONALLICENCE 700 1- Forel M. CR2P, MNHN-CNRS-Université Pierre and Marie Curie - Paris 06, 4 Place Jussieu, Case 104, 75005, Paris, France aut NATIONALLICENCE 700 1- Crasquin S. CR2P, MNHN-CNRS-Université Pierre and Marie Curie - Paris 06, 4 Place Jussieu, Case 104, 75005, Paris, France aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/4(2015-06-01), 1025-1037 1437-3254 104:4<1025 2015 104 531