Anomalous subsidence on the rifted volcanic margin of Pakistan: No influence from Deccan plume

Details Anomalous subsidence on the rifted volcanic margin of Pakistan: No influence from Deccan plume Anomalous subsidence on the rifted volcanic margin of Pakistan: No influence from Deccan plume

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008e%26psl.272..231c&link_type=abstract

Earth and Planetary Science Letters, Volume 272, Issue 1-2, p. 231-239.

Physics

1

Scientific paper

The role of hotter than ambient plume mantle in the formation of a rifted volcanic margin in the northern Arabian Sea is investigated using subsidence analysis of a drill site located on the seismically defined Somnath volcanic ridge. The ridge has experienced > 4 km of subsidence since 65 Ma and lies within oceanic lithosphere. We estimate crustal thickness to be 9.5 11.5 km. Curiously < 400 m of the thermal subsidence occurred prior to 37 Ma, when subsidence rates would normally be at a maximum. We reject the hypothesis that this was caused by increasing plume dynamic support after continental break-up because the size of the thermal anomalies required are unrealistic (> 600 °C), especially considering the rapid northward drift of India relative to the Deccan-Réunion hotspot. We suggest that this reflects very slow lithospheric growth, possibly caused by vigorous asthenospheric convection lasting > 28 m.y., and induced by the steep continent ocean boundary. Post-rift slow subsidence is also recognized on volcanic margins in the NE Atlantic and SE Newfoundland and cannot be used as a unique indicator of plume mantle involvement in continental break-up.

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