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

ANNE E. JAY and MIKE WIDDOWSON
Journal of the Geological Society, 165, 177-188, 14 January 2008, https://doi.org/10.1144/0016-76492006-062
ANNE E. JAY
Volcano Dynamics Group, Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK (e-mail: )
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MIKE WIDDOWSON
Volcano Dynamics Group, Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK (e-mail: )
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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 × 106 km3.

  • © 2008 The Geological Society of London
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Journal of the Geological Society: 165 (1)
Journal of the Geological Society
Volume 165, Issue 1
January 2008
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Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province: implications for eruptive extent and volumes

ANNE E. JAY and MIKE WIDDOWSON
Journal of the Geological Society, 165, 177-188, 14 January 2008, https://doi.org/10.1144/0016-76492006-062
ANNE E. JAY
Volcano Dynamics Group, Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK (e-mail: )
  • Find this author on Google Scholar
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MIKE WIDDOWSON
Volcano Dynamics Group, Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK (e-mail: )
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Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province: implications for eruptive extent and volumes

ANNE E. JAY and MIKE WIDDOWSON
Journal of the Geological Society, 165, 177-188, 14 January 2008, https://doi.org/10.1144/0016-76492006-062
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  • Article
    • Abstract
    • Deccan structure and stratigraphy
    • The SE Deccan field area
    • Sampling and analytical methods
    • Chemostratigraphical interpretation and geological map
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