The University of Southampton
University of Southampton Institutional Repository

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

Abstract

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.

Archive (ZIP) Robinson_figs_table_2001.zip - Other
Download (388kB)
Microsoft Word Robinson.doc - Other
Download (92kB)

More information

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

Identifiers

Local EPrints ID: 220
URI: http://eprints.soton.ac.uk/id/eprint/220
ISSN: 0012-821X
PURE UUID: 9f0b6553-c8b7-46a8-a061-50da392d361c
ORCID for T.A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

Catalogue record

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

Export record

Altmetrics

Contributors

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

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×