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Biogeochemical controls on photic-zone euxinia during the end-Permian mass extinction

K. M. Meyer, L. R. Kump and A. Ridgwell
Biogeochemical controls on photic-zone euxinia during the end-Permian mass extinction
Geology (Boulder) (September 2008) 36 (9): 747-750

Abstract

Geochemical, biomarker, and isotopic evidence suggests that the end-Permian was characterized by extreme oceanic anoxia that may have led to hydrogen sulfide buildup and mass extinction. We use an earth system model to quantify the biogeochemical and physical conditions necessary for widespread oceanic euxinia and hydrogen sulfide release to the atmosphere. Greater than threefold increases in ocean nutrient content combined with nutrient-trapping ocean circulation cause surface-water H (sub 2) S accumulation in the paleo-Tethys Ocean and in areas of strong upwelling. Accounting for the presence of sulfide-oxidizing phototrophs in the model suppresses but does not prevent widespread release of H (sub 2) S to the atmosphere. Evidence from the geologic record is consistent with modeled geochemical distributions of widespread nutrient-induced euxinia during the end-Permian, suggesting H (sub 2) S toxicity and hypercapnia may have provided the kill mechanism for extinction.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 36
Serial Issue: 9
Title: Biogeochemical controls on photic-zone euxinia during the end-Permian mass extinction
Affiliation: Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Pages: 747-750
Published: 200809
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2008-116948
Categories: StratigraphyGeneral geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2008187
Illustration Description: illus. incl. sketch maps
Secondary Affiliation: University of Bristol, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200844
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