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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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.
|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)
|Date Deposited:||13 Oct 2004|
|Last Modified:||25 Apr 2013 09:09|
|Contact Email Address:||email@example.com|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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