Localized rifting at Chagos Bank in the India-Capricorn plate boundary zone


Henstock, Timothy J. and Minshull, Timothy A. (2004) Localized rifting at Chagos Bank in the India-Capricorn plate boundary zone. Geology, 32, (3), 237-240. (doi:10.1130/G19850.1).

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Original Publication URL: http://dx.doi.org/10.1130/G19850.1

Description/Abstract

Chagos Bank is a region of thick crust in the central Indian Ocean where a concentration of seismicity indicates that extension is ongoing. We have modeled bathymetry and gravity data to show that the crust-mantle boundary shallows near a seabed trough, consistent with a total extension of ~15 km over a zone ;50 km broad. This estimate is consistent with 5–10 m.y. of deformation at the present rate of relative India-Capricorn motion; the ~15 km of extension is toward the lower limit of the total extension expected from magnetic anomaly reconstructions, but would be accumulated in 1–3 m.y. in a regime having the present-day seismicity. We attribute the localization of seismicity beneath Chagos Bank to a weak rheology caused by its thick crust.

Item Type: Article
ISSNs: 0091-7613 (print)
Related URLs:
Keywords: extensional tectonics, indian ocean, plate boundaries, intraplate tectonics, seismicity
Subjects: Q Science > QE Geology
G Geography. Anthropology. Recreation > GC Oceanography
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 9818
Date Deposited: 13 Oct 2004
Last Modified: 27 Mar 2014 18:01
Contact Email Address: then@soc.soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/9818

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