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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), pp. 237-240. (doi:10.1130/G19850.1).

Record type: Article


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.

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Published date: 2004
Keywords: extensional tectonics, indian ocean, plate boundaries, intraplate tectonics, seismicity


Local EPrints ID: 9818
ISSN: 0091-7613
PURE UUID: f558120e-7c74-4e07-ad9e-56b6cce8ce33
ORCID for Timothy J. Henstock: ORCID iD
ORCID for Timothy A. Minshull: ORCID iD

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Date deposited: 13 Oct 2004
Last modified: 17 Jul 2017 17:08

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