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Pyrite framboid study of marine Permian-Triassic boundary sections; a complex anoxic event and its relationship to contemporaneous mass extinction

David P. G. Bond and Paul B. Wignall
Pyrite framboid study of marine Permian-Triassic boundary sections; a complex anoxic event and its relationship to contemporaneous mass extinction
Geological Society of America Bulletin (July 2010) 122 (7-8): 1265-1279

Abstract

Size analysis of pyrite framboids has been undertaken on epicontinental Permian-Triassic boundary sections throughout the world in order to evaluate the intensity and duration of anoxia. Mid-paleolatitude sections from the margins of the Boreal (Spitsbergen, Greenland) and Neotethyan oceans (Western Australia) reveal intense anoxia throughout the Permian-Triassic boundary interval with euxinic conditions frequently developing, and dysoxia encountered even in relatively shallow-water settings above storm wave base. At equatorial paleolatitudes, weakly oxygenated (dysoxic) conditions are widely developed in a broad range of water depths including those shallow enough to produce oolite deposition, although euxinia was rare. Western and eastern Tethyan locations reveal a complex and unstable redox history: anoxia in the Hindeodus praeparvus Zone was replaced by oxygenated facies in the Permian-Triassic boundary interval (H. changxingensis to H. parvus zones). Oxygen-poor deposition returned during the succeeding Isarcicella isarcica Zone. The more persistent and intense development of oxygen restriction in cooler water, mid-paleolatitude sections argues against warming and dissolved oxygen decline as the key cause of Permian-Triassic boundary anoxia. In higher paleolatitudes the benthic invertebrate extinctions occurred during a prolonged phase of oxygen-poor deposition, while in equatorial Tethyan locations benthic losses occurred at the end of the first anoxic phase (in the late H. praeparvus Zone).


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 122
Serial Issue: 7-8
Title: Pyrite framboid study of marine Permian-Triassic boundary sections; a complex anoxic event and its relationship to contemporaneous mass extinction
Affiliation: University of Leeds, School of Earth and Environment, Leeds, United Kingdom
Pages: 1265-1279
Published: 201007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 76
Accession Number: 2010-050199
Categories: StratigraphyMineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. strat. cols., 2 tables, sketch map
N20°00'00" - N53°00'00", E74°00'00" - E135°00'00"
N45°45'00" - N48°30'00", E16°10'00" - E23°00'00"
N42°00'00" - N49°00'00", W117°15'00" - W111°04'60"
N76°00'00" - N81°00'00", E10°00'00" - E30°00'00"
S35°00'00" - S14°00'00", E113°00'00" - E129°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, 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: 201027
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