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Early and Late Alkali Igneous Pulses and a High-3He Plume Origin for the Deccan Flood Basalts

Basu, Asish R., Renne, Paul R., DasGupta, Deb K., Teichmann, Friedrich, Poreda, Robert J.·1993·Science
DOI 10.1126/science.261.5123.902
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Abstract

Several alkalic igneous complexes of nephelinite-carbonatite affinities occur in extensional zones around a region of high heat flow and positive gravity anomaly within the continental flood basalt (CFB) province of Deccan, India. Biotites from two of the complexes yield 40 Ar/39 Ar dates of 68.53 ± 0.16 and 68.57 ± 0.08 million years. Biotite from a third complex, which intrudes the flood basalts, yields an 40 Ar/39 Ar date of 64.96 ± 0.11 million years. The complexes thus represent early and late magmatism with respect to the main pulse of CFB volcanism 65 million years ago. Rocks from the older complexes show a 3 He/4 He ratio of 14.0 times the air ratio, an initial 87 Sr/86 Sr ratio of 0.70483, and other geochemical characteristics similar to ocean island basalts; the later alkalic pulse shows isotopic evidence of crustal contamination. The data document 3.5 million years of incubation of a primitive, high-3 He mantle plume before the rapid eruption of the Deccan CFB.

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Cited by

Metadata

Authors
Basu, A. R., Renne, P. R., DasGupta, D. K., Teichmann, F., & Poreda, R. J.
Affiliations
  • Department of Geological Sciences, University of Rochester, Rochester, NY 14627
  • Institute of Human Origins, Geochronology, Center, Berkeley, CA 94709
  • Department of Geology, Presidency College, Calcutta, India 700073
Venue
Science
Publisher
American Association for the Advancement of Science (AAAS)
Published
1993-08-13
Volume
261
Issue
5123
Pages
902-906
ISSN
  • 0036-8075
  • 1095-9203
DOI
10.1126/science.261.5123.902
Cited by
291
References
0
Language
en

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