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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

Jourdan, F.; Hodges, K.; Sell, B.; Schaltegger, U.; Wingate, M. T. D.; Evins, L. Z.; Söderlund, Ulf LU ; Haines, P. W.; Phillips, D. and Blenkinsop, T. (2014) In Geology 42(6). p.543-546
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Geology
volume
42
issue
6
pages
543 - 546
publisher
Geological Society of America
external identifiers
  • wos:000339961100023
  • scopus:84902198410
ISSN
0091-7613
DOI
10.1130/G35434.1
language
English
LU publication?
yes
id
c959b8b8-63cc-4961-a583-73c8c82cdbef (old id 4662606)
date added to LUP
2014-09-25 14:16:10
date last changed
2017-06-04 03:53:40
@article{c959b8b8-63cc-4961-a583-73c8c82cdbef,
  abstract     = {The voluminous Kalkarindji flood basalts erupted in Australia during the Cambrian and covered &gt;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 &lt; 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.},
  author       = {Jourdan, F. and Hodges, K. and Sell, B. and Schaltegger, U. and Wingate, M. T. D. and Evins, L. Z. and Söderlund, Ulf and Haines, P. W. and Phillips, D. and Blenkinsop, T.},
  issn         = {0091-7613},
  language     = {eng},
  number       = {6},
  pages        = {543--546},
  publisher    = {Geological Society of America},
  series       = {Geology},
  title        = {High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early-Middle Cambrian (Stage 4-5) extinction},
  url          = {http://dx.doi.org/10.1130/G35434.1},
  volume       = {42},
  year         = {2014},
}