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Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province: implications for eruptive extent and volumes

JAY, ANNE E., WIDDOWSON, MIKE·2008·Journal of the Geological Society
DOI 10.1144/0016-76492006-062
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Abstract

The Deccan Volcanic Province is one of the world's largest continental flood basalt provinces, and derives additional importance because its eruptions (64–67 Ma) straddle the Cretaceous–Tertiary boundary. To better assess the environmental impact of Deccan volcanism, and its possible effect upon Cretaceous–Tertiary boundary biota, it is necessary to document the stratigraphy, chronology and volume of the eruptions. New chemostratigraphical data permit mapping of the SE Deccan. These data strengthen the likelihood that the Rajahmundry Traps of eastern India were originally fed by long-distance flows, and are an extension of the Main Deccan Volcanic Province. An east–west cross-section reveals a depression or ‘moat’ around the SE periphery of the Deccan Volcanic Province. This provided a site in which shallow lakes initially formed, and along which later lava eruptions became channelled and confined. Published palaeomagnetic data indicate that the lavas of the SE Deccan were erupted during Chron 29R, coeval with the Cretaceous–Tertiary boundary, and the chemostratigraphic data place the associated lake sediments (i.e. Lameta Group) beneath and within lavas of the Wai Subgroup. Finally, these new map data are combined with previous work to provide a quantitative estimate for the original Deccan Volcanic Province eruptive volume of c . 1.3 × 10 6 km 3 .

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Metadata

Authors
JAY, A. E., & WIDDOWSON, M.
Affiliations
Volcano Dynamics Group, Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK (e-mail: )
Venue
Journal of the Geological Society
Publisher
Geological Society of London
Published
2008-01
Volume
165
Issue
1
Pages
177-188
ISSN
  • 0016-7649
  • 2041-479X
DOI
10.1144/0016-76492006-062
Cited by
211
References
0
Language
en
Licence
doi.org/10.15223/policy-002 (stm-asf)

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CoChat. (2026). Citation check: Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province: implications for eruptive extent and volumes. https://app.cochat.ai/papers/10.1144/0016-76492006-062
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JAY, A. E., & WIDDOWSON, M. (2008). Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province: implications for eruptive extent and volumes. Journal of the Geological Society. https://doi.org/10.1144/0016-76492006-062