Australia: The Land Where Time Began

A biography of the Australian continent 

Deccan Volcanism - Chemostratigraphic Evidence from the Marine Osmium Isotope Record

It has been hypothesised that continental flood basalt (CFB) volcanism had a causative role in global climate change and mass extinctions. A clear assessment of the chronology of the environmental consequences of CFB volcanism was not possibly as a result of uncertainties associated with radiometric dating. The results of the study carried out by the authors1 document a decline of 25 % in 187Os/188Os record predating the Cretaceous-Tertiary (KTB), coinciding with the warming event of the Late Maastrichtian. A chemostratigraphic marker of the Deccan volcanism is provided by this decline, according to the authors1, which therefore constitutes compelling evidence that a transient global warming event of 3-5oC that is fully resolved from the KTB mass extinction event was the main environmental consequence of the Deccan volcanism.

Sources & Further reading

  1. Ravizza, G., and B. Peucker-Ehrenbrink. "Chemostratigraphic Evidence of Deccan Volcanism from the Marine Osmium Isotope Record." Science 302, no. 5649 (November 21, 2003 2003): 1392-95.
Author: M. H. Monroe
Last updated  15/06/2013
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