Chemostratigraphic Evidence of Deccan Volcanism from the Marine Osmium Isotope Record

Details Chemostratigraphic Evidence of Deccan Volcanism from the Marine Osmium Isotope Record Chemostratigraphic Evidence of Deccan Volcanism from the Marine Osmium Isotope Record

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003sci...302.1392r&link_type=abstract

Science, Volume 302, Issue 5648, pp. 1392-1396 (2003).

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Scientific paper

Continental flood basalt (CFB) volcanism is hypothesized to have played a causative role in global climate change and mass extinctions. Uncertainties associated with radiometric dating preclude a clear chronological assessment of the environmental consequences of CFB volcanism. Our results document a 25% decline in the marine 187Os/188Os record that predates the Cretaceous-Tertiary boundary (KTB) and coincides with late Maastrichtian warming. We argue that this decline provides a chemostratigraphic marker of Deccan volcanism and thus constitutes compelling evidence that the main environmental consequence of Deccan volcanism was a transient global warming event of 3° to 5°C that is fully resolved from the KTB mass extinction.

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