Calves, Gerome; Clift, Peter D; Inam, Asif (2008): Lithology of sediments from the Arabian Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.717633, Supplement to: Calves, G et al. (2008): Anomalous subsidence on the rifted volcanic margin of Pakistan: No influence from Deccan plume. Earth and Planetary Science Letters, 272(1-2), 231-239, https://doi.org/10.1016/j.epsl.2008.04.042
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Abstract:
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.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 10.375065 * Median Longitude: 61.979015 * South-bound Latitude: -7.083200 * West-bound Longitude: 58.124700 * North-bound Latitude: 27.833330 * East-bound Longitude: 65.833330
Date/Time Start: 1972-06-06T00:00:00 * Date/Time End: 1972-06-06T00:00:00
Event(s):
24-237 * Latitude: -7.083200 * Longitude: 58.124700 * Date/Time: 1972-06-06T00:00:00 * Elevation: -1623.0 m * Penetration: 693.5 m * Recovery: 311.5 m * Location: Indian Ocean//PLATEAU * Campaign: Leg24 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 575.5 m cored; 38 m drilled; 54.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Calves, G; Clift, PD; Inam, A (2008): (Table 1) Lithology of DSDP Hole 24-237. https://doi.org/10.1594/PANGAEA.717618
- Calves, G; Clift, PD; Inam, A (2008): (Table 1) Lithology of sediment core PAK-G2. https://doi.org/10.1594/PANGAEA.717619