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Low degree melting under the Southwest Indian Ridge: the roles of mantle temperature, conductive cooling and wet melting

Robinson, C.J., Bickle, M.J., Minshull, T.A., White, R.S. and Nichols, A.R.L. (2001) Low degree melting under the Southwest Indian Ridge: the roles of mantle temperature, conductive cooling and wet melting Earth and Planetary Science Letters, 188, (3-4), pp. 383-398. (doi:10.1016/S0012-821X(01)00329-6).

Record type: Article


Both low mantle temperatures and conductive cooling have been suggested as the cause of the atypically thin oceanic crust and the incompatible element enrichment characteristic of very slow-spreading ridges. Here we present a model of melting under the Southwest Indian Ridge, which takes into account mantle temperature, conductive cooling, source composition and wet melting. The model parameters are constrained by oceanic crustal thickness, lava chemistry and isotopic composition and water content. The results suggest that conductive cooling to a depth of around 20 km, expected in areas with a full spreading rate of 15 mm/yr, is necessary to generate the Southwest Indian Ridge lava chemistry, but not that from faster spreading rate ridges at 23°N on the Mid Atlantic Ridge or 45°N on the Juan de Fuca Ridge. The mantle potential temperatures of ~1280°C, estimated for the Southwest Indian Ridge lavas are close to the global average of the upper mantle. Mantle water contents of 150-300 ppm can explain the observed melt water contents and allow sufficient melting at depth to explain the observed heavy rare earth element depletions in the melts.

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Published date: 2001
Keywords: spreading centres, mantle, Southwest Indian Ridge


Local EPrints ID: 220
ISSN: 0012-821X
PURE UUID: 9f0b6553-c8b7-46a8-a061-50da392d361c
ORCID for T.A. Minshull: ORCID iD

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Date deposited: 14 Nov 2003
Last modified: 17 Jul 2017 17:19

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Author: C.J. Robinson
Author: M.J. Bickle
Author: T.A. Minshull ORCID iD
Author: R.S. White
Author: A.R.L. Nichols

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