Sulfur isotopic evidence for chemocline upward excursions during the end-Permian mass extinction

Details Sulfur isotopic evidence for chemocline upward excursions during the end-Permian mass extinction Sulfur isotopic evidence for chemocline upward excursions during the end-Permian mass extinction

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70.5740r&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 70, Issue 23, p. 5740-5752.

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Scientific paper

The latest Permian was a time of major change in ocean chemistry, accompanying the greatest mass extinction of the Phanerozoic. To examine the nature of these changes, samples from two well-studied marine sections that span the Permian Triassic boundary have been analyzed: the Meishan and Shangsi sections located in Southern China. Isotopic analysis of the carbonate-associated sulfate in these samples provides a detailed record of several isotopic shifts in δ34SCAS approaching and across the PTB, ranging from +30 to -15‰ (VCDT), with repeated asynchronous fluctuations at the two locations. We interpret the patterns of isotopic shifts, in conjunction with other data, to indicate a shallow unstable chemocline overlying euxinic deep-water which periodically upwelled into the photic zone. These chemocline upward excursion events introduced sulfide to the photic zone stimulating a bloom of phototrophic sulfur oxidizing bacteria. We hypothesize that elemental sulfur globules produced by these organisms and 34S-depleted pyrite produced in the euxinic water column were deposited in the sediment; later oxidation led to incorporation as CAS. This created the large changes to the δ34SCAS observed in the latest Permian at these locations.

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