Oxidative conditions can lead to exceptional preservation through phosphatization
In: ISSN: 0091-7613, 2020
Online
academicJournal
Zugriff:
International audience ; Exceptional preservation through phosphatization is primarily controlled by a reduction in pH, favoring the precipitation of apatite over that of calcite. Laboratory experiments have suggested that phosphatization results from anoxic decay. Here we report results of the fine-scale mineralogical characterization of Cretaceous phosphatized fossils of teleost fishes and crustaceans from the Jebel oum Tkout Lagerstätte (Morocco). Data collected using complementary laboratory and synchrotron-based X-ray techniques reveal that oxidative conditions were established at a certain step of decay. Supporting these conclusions are the presence, covering and embedded in the phosphatized tissues, of Fe(III)-rich mineral phases, the precipitation of which was likely biologically induced during decay. The present study highlights that the establishment of oxidative conditions during decay can be compatible with exceptional preservation of fossils through phosphatization.
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Oxidative conditions can lead to exceptional preservation through phosphatization
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Autor/in / Beteiligte Person: | Gueriau, Pierre ; Bernard, Sylvain ; Farges, François ; Mocuta, Cristian ; Dutheil, Didier, B ; Adatte, Thierry ; Bomou, Brahimsamba ; Godet, Marie ; Thiaudière, Dominique ; Charbonnier, Sylvain ; Bertrand, Loïc ; Synchrotron SOLEIL (SSOLEIL) ; Centre National de la Recherche Scientifique (CNRS) ; Institut photonique d'analyse non-destructive européen des matériaux anciens (IPANEMA) ; Muséum national d'Histoire naturelle (MNHN)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture (MC) ; Institute of Earth Sciences Lausanne ; Université de Lausanne = University of Lausanne (UNIL) ; Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC) ; Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement IRD : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) ; Centre de Recherche en Paléontologie - Paris (CR2P) ; Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) ; Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM) ; Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Ecole Normale Supérieure Paris-Saclay (ENS Paris Saclay) ; MNHN ATM Biodiversité actuelle et fossile |
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Zeitschrift: | ISSN: 0091-7613, 2020 |
Veröffentlichung: | HAL CCSD ; Geological Society of America, 2020 |
Medientyp: | academicJournal |
DOI: | 10.1130/G45924.1 |
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