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High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early-Middle Cambrian (Stage 4-5) extinction

F. Jourdan, K. Hodges, B. Sell, U. Schaltegger, M. T. D. Wingate, L. Z. Evins, U. Soderlund, P. W. Haines, D. Phillips and T. Blenkinsop
High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early-Middle Cambrian (Stage 4-5) extinction
Geology (Boulder) (April 2014) 42 (6): 543-546

Abstract

The voluminous Kalkarindji flood basalts erupted in Australia during the Cambrian and covered >2 X 10 (super 6) km (super 2) . New U-Pb and (super 40) Ar/ (super 39) Ar age data from intrusive rocks and lava flows yielded statistically indistinguishable ages at ca. 511 Ma, suggesting a relatively brief emplacement for this province. A zircon age of 510.7 + or - 0.6 Ma shows that this province is temporally indistinguishable at the few-hundred-thousand-year level from the Early-Middle Cambrian (Stage 4-5) boundary age of 510 + or - 1 Ma, which marks the first severe extinction of the Phanerozoic and an extended marine anoxia period. Sulfur concentration measurements ranging from <50 to 1900 mu g/g, and fractal analysis of extensive explosive volcanic breccias, suggest that blasts and phreatomagmatic explosions have contributed to injection of large amounts of sulfur into the stratosphere. In addition, magma intrusions in oil, gas, and sulfate deposits may have generated significant emission of CH (sub 4) and SO (sub 2) which, along with volcanic gases, would have combined to cause an oscillation of the climate and led to the Cambrian extinction.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 6
Title: High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early-Middle Cambrian (Stage 4-5) extinction
Affiliation: Curtin University, Department of Applied Geology, Perth, West. Aust., Australia
Pages: 543-546
Published: 20140424
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2014-033408
Categories: GeochronologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
S44°00'00" - S10°00'00", E113°00'00" - E154°00'00"
Secondary Affiliation: University of Geneva, CHE, SwitzerlandGeological Survey of Western Australia, AUS, AustraliaSwedish Museum of Natural History, SWE, SwedenLund University, SWE, SwedenUniversity of Melbourne, AUS, AustraliaJames Cook University, 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: 201421
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