Cretaceous volcanic rocks of the South Tethyan suture zone, Pakistan: implications for the Réunion hotspot and Deccan Traps

The location, ages, and geochemical characteristics of marine volcanic rocks preserved in the South Tethyan suture zone of Pakistan suggest that the Reunion hotspot was active off northwestern Greater India well before the emplacement, far to the south, of the Deccan flood basalts, the great bulk of...

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Bibliographic Details
Published in:Earth and planetary science letters 2002-10, Vol.203 (1), p.295-310
Main Authors: Mahoney, J J, Duncan, R A, Khan, W, Gnos, E, McCormick, G R
Format: Article
Language:English
Subjects:
Marine
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Summary:The location, ages, and geochemical characteristics of marine volcanic rocks preserved in the South Tethyan suture zone of Pakistan suggest that the Reunion hotspot was active off northwestern Greater India well before the emplacement, far to the south, of the Deccan flood basalts, the great bulk of which were erupted at 65-66 Ma and are widely believed to be associated with the hotspot's plume-head phase. Most of the suture zone samples have Nd-Pb-Sr isotopic ratios (e.g. age-corrected epsilon sub(Nd)(t) = +3.0 to +4.6) close to those expected for modern-type Reunion source mantle in the Late Cretaceous, and their incompatible element patterns resemble those of recent Reunion shield lavas. super(40)Ar- super(39)Ar incremental heating yields ages of 73.4-72.0 Ma. Nevertheless, unless even older ages are discovered among the suture zone rocks, a pre-Deccan marine phase of Reunion hotspot activity on the Tethyan side of Greater India can be accommodated within the framework of the plume-head model.
ISSN:0012-821X
DOI:10.1016/s0012-821x(02)00840-3