Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province: implications for eruptive extent
and volumes
ANNE E. JAY
MIKE WIDDOWSON
10.6084/m9.figshare.3454451.v1
https://geolsoc.figshare.com/articles/journal_contribution/Stratigraphy_structure_and_volcanology_of_the_SE_Deccan_continental_flood_basalt_province_implications_for_eruptive_extent___and_volumes/3454451
<p>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 <em>c</em>. 1.3 × 10<sup>6</sup> km<sup>3</sup>.
</p>
2016-06-21 12:07:35
Chron 29 R
SE Deccan
Cretaceous
New chemostratigraphical data
Deccan Volcanic Province eruptive volume
Main Deccan Volcanic Province
chemostratigraphic data place
Deccan Volcanic Province
lava
eruption
flood basalt province
flood basalt provinces
Geology