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Ulf Söderlund

Ulf Söderlund

Professor

Ulf Söderlund

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

Författare

  • F. Jourdan
  • K. Hodges
  • B. Sell
  • U. Schaltegger
  • M. T. D. Wingate
  • L. Z. Evins
  • Ulf Söderlund
  • P. W. Haines
  • D. Phillips
  • T. Blenkinsop

Summary, in English

The voluminous Kalkarindji flood basalts erupted in Australia during the Cambrian and covered >2 x 10(6) km(2). New U-Pb and Ar-40/Ar-39 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 +/- 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 +/- 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 CH4 and SO2 which, along with volcanic gases, would have combined to cause an oscillation of the climate and led to the Cambrian extinction.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2014

Språk

Engelska

Sidor

543-546

Publikation/Tidskrift/Serie

Geology

Volym

42

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

Geological Society of America

Ämne

  • Geology

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0091-7613