Dynamic anoxic ferruginous conditions during the end-Permian mass extinction and recovery

M. O. Clarkson (), R. A. Wood, S. W. Poulton, S. Richoz, R. J. Newton, S. A. Kasemann, F. Bowyer and L. Krystyn
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M. O. Clarkson: School of GeoSciences, University of Edinburgh
R. A. Wood: School of GeoSciences, University of Edinburgh
S. W. Poulton: School of Earth and Environment, University of Leeds
S. Richoz: Institute of Earth Sciences, NAWI Graz, University of Graz
R. J. Newton: School of Earth and Environment, University of Leeds
S. A. Kasemann: University of Bremen
F. Bowyer: School of GeoSciences, University of Edinburgh
L. Krystyn: Institute for Palaeontology, Vienna University

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract The end-Permian mass extinction, ∼252 million years ago, is notable for a complex recovery period of ∼5 Myr. Widespread euxinic (anoxic and sulfidic) oceanic conditions have been proposed as both extinction mechanism and explanation for the protracted recovery period, yet the vertical distribution of anoxia in the water column and its temporal dynamics through this time period are poorly constrained. Here we utilize Fe–S–C systematics integrated with palaeontological observations to reconstruct a complete ocean redox history for the Late Permian to Early Triassic, using multiple sections across a shelf-to-basin transect on the Arabian Margin (Neo-Tethyan Ocean). In contrast to elsewhere, we show that anoxic non-sulfidic (ferruginous), rather than euxinic, conditions were prevalent in the Neo-Tethys. The Arabian Margin record demonstrates the repeated expansion of ferruginous conditions with the distal slope being the focus of anoxia at these times, as well as short-lived episodes of oxia that supported diverse biota.

Date: 2016
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DOI: 10.1038/ncomms12236

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