Hydrogen sulphide poisoning of shallow seas following the end-Triassic extinction

Sylvain Richoz, Bas van de Schootbrugge, Jörg Pross, Wilhelm Püttmann, Tracy M. Quan, Sofie Lindström, Carmen Heunisch, Jens Fiebig, Robert Maquil, Stefan Schouten, Christoph A. Hauzenberger, Paul B. Wignall

    Publikation: Bidrag til tidsskriftArtikelForskningpeer review

    74 Citationer (Scopus)

    Abstrakt

    The evolution of complex life over the past 600 million years was disrupted by at least five mass extinctions, one of which occurred at the close of the Triassic period. The end-Triassic extinction corresponds to a period of high atmospheric-CO2 concentrations caused by massive volcanism and biomass burning; most extinction scenarios invoke the resulting environmental perturbations in accounting for the loss of marine and terrestrial biodiversity. Here we reconstruct changes in Tethyan shallow marine ecosystems and ocean redox chemistry from earliest Jurassic (Hettangian)-aged black shales from Germany and Luxemburg. The shales contain increased concentrations of the biomarker isorenieratane, a fossilized pigment from green sulphur bacteria. The abundance of green sulphur bacteria suggests that the photic zone underwent prolonged periods of high concentrations of hydrogen sulphide. This interval is also marked by the proliferation of green algae, an indicator of anoxia. We conclude that the redox changes in the entire water column reflect sluggish circulation in marginal regions of the Tethys Ocean. We suggest that the resultant repeated poisoning of shallow epicontinental seasg-hotspots of Mesozoic biodiversityg-with hydrogen sulphide may have slowed the recovery of marine ecosystems during the Early Jurassic.

    OriginalsprogEngelsk
    Sider (fra-til)662-667
    Antal sider6
    TidsskriftNature Geoscience
    Vol/bind5
    Udgave nummer9
    DOI
    StatusUdgivet - sep. 2012

    Programområde

    • Programområde 3: Energiressourcer

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