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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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) |
| Item ID: | 9818 |
| Date Deposited: | 13 Oct 2004 |
| Last Modified: | 25 Apr 2013 09:09 |
| Contributors: | Henstock, Timothy J. (Author) Minshull, Timothy A. (Author) |
| Date: | 2004 |
| Status: | Published |
| Contact Email Address: | then@soc.soton.ac.uk |
| URI: | http://eprints.soton.ac.uk/id/eprint/9818 |
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