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Self-consistent modeling of crustal thickness at Chagos-Laccadive Ridge from bathymetry and gravity data

Henstock, Timothy J. and Thompson, Phillip J. (2004) Self-consistent modeling of crustal thickness at Chagos-Laccadive Ridge from bathymetry and gravity data Earth and Planetary Science Letters, 224, (3-4), pp. 325-336. (doi:10.1016/j.epsl.2004.05.021).

Record type: Article


The Chagos–Laccadive ridge (CLR) is an aseismic ridge in the Indian Ocean that formed by the action of the Réunion mantle plume. We use modeling of bathymetry and gravity data to constrain the crustal thickness variations at three locations from 0°S to 6°S where the plume was likely interacting directly with the Carlsberg spreading center. Ambiguities in the modeling were reduced by requiring both the density and thickness of the crust to be consistent with a single set of mantle melting conditions, in this case using a passive upwelling model in which mantle potential temperature is the controlling factor. Mean crustal thicknesses beneath the ridge at the three locations predicted from the gravity modeling were 16.6, 12.5 and 27.0 km; these thicknesses are up to 50% greater than would be obtained had we not required self-consistency in the modeling. If the thick crust is produced entirely by elevated potential temperatures in the melting region, mantle temperatures would have to be 100–250 °C higher than normal. Abrupt decreases in crustal thickness at a large-offset fracture zone are consistent with previous models for plume-spreading center interactions.

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Published date: 15 August 2004
Keywords: chagos–laccadive ridge, crustal thickness, gravity modeling, ridge–hotspot interaction


Local EPrints ID: 9161
ISSN: 0012-821X
PURE UUID: 885ffc7d-5bd5-4774-88f5-0dbc0061878e
ORCID for Timothy J. Henstock: ORCID iD

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Date deposited: 12 Oct 2004
Last modified: 17 Jul 2017 17:11

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Author: Phillip J. Thompson

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