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Determination of rapid Deccan eruptions across the Cretaceous‐Tertiary boundary using paleomagnetic secular variation: Results from a 1200‐m‐thick section in the Mahabaleshwar escarpment

Chenet, Anne‐Lise, Fluteau, Frédéric, Courtillot, Vincent, Gérard, Martine, Subbarao, K. V.·2008·Journal of Geophysical Research: Solid Earth
DOI 10.1029/2006jb004635
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Abstract

Flow‐by‐flow reanalysis of paleomagnetic directions in two sections of the Mahabaleshwar escarpment, coupled with analysis of intertrappean alteration levels shows that volcanism spanned a much shorter time than previously realized. The sections comprise the upper part of magnetic chron C29r, transitional directions and the lowermost part of C29n. Lack of paleosecular variation allows identification of four directional groups, implying very large (40 to 180 m thick) single eruptive events (SEEs) having occurred in a few decades. Paleomagnetism allows temporal constraints upon the formation of 9 out of 23 thin red bole levels found in the sections to no more than a few decades; the two thickest altered layers could have formed in 1 to 50 ka. The typical volumes of SEEs (corresponding to magnetic directional groups) are estimated at 3000 to 20,000 km 3, with flux rates ∼100 km 3 a−1, having lasted for decades. Flood basalt emission can be translated into SO 2 injection rates of several Gt a−1, which could have been the main agent of environmental change. The total volume of SO 2 emitted by the larger SEEs could be on the order of that released by the Chicxulub impact. Moreover, each SEE may have injected 10 to 100 times more SO 2 in the atmosphere than the deleterious 1783 Laki eruption. The detailed time sequence of SEEs appears to be the key feature having controlled the extent of climate change. If several SEEs erupted in a short sequence (compared to the equilibration time of the ocean), they could have generated a runaway effect leading to mass extinction.

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Metadata

Authors
Chenet, A., Fluteau, F., Courtillot, V., Gérard, M., & Subbarao, K. V.
Affiliations
  • Laboratoire de Paléomagnétisme IPGP Paris France
  • Institut de Recherche pour le Développement and IMPMC Paris France
  • Centre for Earth Science and Space Sciences University of Hyderabad Hyderabad India
Venue
Journal of Geophysical Research: Solid Earth
Publisher
American Geophysical Union (AGU)
Published
2008-04
Volume
113
Issue
B4
ISSN
0148-0227
DOI
10.1029/2006jb004635
Cited by
209
References
2
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 29 d)

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