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Oxic facies and the Late Devonian mass extinction, Canning Basin, Australia

Annette D. George, Nancy Chow and Kate M. Trinajstic
Oxic facies and the Late Devonian mass extinction, Canning Basin, Australia
Geology (Boulder) (February 2014) 42 (4): 327-330

Abstract

The close association of anoxic or dysoxic sedimentary rocks and the major Late Devonian (Frasnian-Famennian) mass extinction has focused considerable attention on anoxia as the major cause or as a major factor in a multicausal scenario. The record of the Late Devonian biotic crisis in the well-known reef complexes of northwestern Australia (Canning Basin), in contrast to many localities elsewhere, does not display sedimentological evidence of anoxia through the Frasnian-Famennian boundary interval. Analysis of continuous drill core through this interval has yielded three positive delta (super 13) C isotopic excursions, only one of which coincides with total organic carbon (TOC) maxima in our data. Multi-element geochemical proxies suggest that TOC maxima preceding positive shifts in delta (super 13) C most likely resulted from higher productivity caused by nutrient influx from continental weathering, given the close association between TOC maxima and regional relative sea-level falls. Our interpretation supports the view that anoxia was not a fundamental driver of mass extinction and stresses the importance of integrated data sets and understanding regional controls on environmental changes and/or stresses.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 4
Title: Oxic facies and the Late Devonian mass extinction, Canning Basin, Australia
Affiliation: University of Western Australia, School of Earth & Environment, Crawley, West. Aust., Australia
Pages: 327-330
Published: 20140224
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2014-024133
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2014124
Illustration Description: illus. incl. geol. sketch map
S24°00'00" - S18°00'00", E120°00'00" - E128°00'00"
Secondary Affiliation: University of Manitoba, CAN, CanadaCurtin University of Technology, AUS, Australia
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: 201415
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