High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction
The voluminous Kalkarindji flood basalts erupted in Australia during the Cambrian and covered >2 × 106 km2. New U-Pb and 40Ar/39Ar age data from intrusive rocks and lava flows yielded statistically indistinguishable ages at ca. 511 Ma, suggesting a relatively brief emplacement for this province....
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
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Geological Society of America
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/15546 |
| _version_ | 1848748922398310400 |
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| author | Jourdan, Fred Hodges, K. Sell, B. Schaltegger, U. Wingate, M. Evins, L. Söderlund, U. Haines, P. Phillips, D. Blenkinsop, T. |
| author_facet | Jourdan, Fred Hodges, K. Sell, B. Schaltegger, U. Wingate, M. Evins, L. Söderlund, U. Haines, P. Phillips, D. Blenkinsop, T. |
| author_sort | Jourdan, Fred |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The voluminous Kalkarindji flood basalts erupted in Australia during the Cambrian and covered >2 × 106 km2. New U-Pb and 40Ar/39Ar 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 µg/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. |
| first_indexed | 2025-11-14T07:12:44Z |
| format | Journal Article |
| id | curtin-20.500.11937-15546 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:12:44Z |
| publishDate | 2014 |
| publisher | Geological Society of America |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-155462017-09-13T13:40:19Z High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction Jourdan, Fred Hodges, K. Sell, B. Schaltegger, U. Wingate, M. Evins, L. Söderlund, U. Haines, P. Phillips, D. Blenkinsop, T. The voluminous Kalkarindji flood basalts erupted in Australia during the Cambrian and covered >2 × 106 km2. New U-Pb and 40Ar/39Ar 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 µg/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. 2014 Journal Article http://hdl.handle.net/20.500.11937/15546 10.1130/G35434.1 Geological Society of America restricted |
| spellingShingle | Jourdan, Fred Hodges, K. Sell, B. Schaltegger, U. Wingate, M. Evins, L. Söderlund, U. Haines, P. Phillips, D. Blenkinsop, T. High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction |
| title | High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction |
| title_full | High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction |
| title_fullStr | High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction |
| title_full_unstemmed | High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction |
| title_short | High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction |
| title_sort | high-precision dating of the kalkarindji large igneous province, australia, and synchrony with the early–middle cambrian (stage 4–5) extinction |
| url | http://hdl.handle.net/20.500.11937/15546 |