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

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Abstract

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-CO 2 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.

Detaljer

Författare
  • 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
Externa organisationer
  • Goethe University
  • Karl-Franzens-University of Graz
  • Senckenberg Biodiversity and Climate Research Centre
  • Oklahoma State University, Stillwater
  • Geological Survey of Denmark and Greenland, Copenhagen, Denmark
  • State Authority for Mining, Energy and Geology
  • Geological Survey of Luxemburg
  • Royal Netherlands Institute of Sea Research
  • University of Leeds
Originalspråkengelska
Sidor (från-till)662-667
Antal sidor6
TidskriftNature Geoscience
Volym5
Utgåva nummer9
StatusPublished - 2012 sep 1
PublikationskategoriForskning
Peer review utfördJa
Externt publiceradJa