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An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions

Dean, S.M., Murton, B.J., Minshull, T.A., Henstock, T.J. and White, R.S. (2009) An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions Earth and Planetary Science Letters, 278, (1-2), pp. 26-39. (doi:10.1016/j.epsl.2008.11.012).

Record type: Article

Abstract

We present an integrated kinematic and geochemical model that determines the composition of melts and their residual source rocks generated by decompression melting of the mantle during continental rifting. Our approach is to construct a unified numerical solution that merges an established lithospheric stretching model which determines the rate and depth at which melting occurs, with several compositional parameterisations of mantle melting to predict the composition of primary melts. We also incorporate a parameterisation for the rare earth elements. Using our approach, we are able to track the composition of the melt fractions and mantle residues as melting progresses. Our unified model shows that primary melt composition is sensitive to rift duration and mantle temperature, with rapid rifting and higher mantle temperatures producing larger melt fractions, at a greater mean pressure of melting, than slower/cooler rifting. Comparison of the model results with primitive basalts recovered from oceanic spreading ridges and rifted margins in the North Atlantic indicates that rift duration and synrift mantle temperature can be inferred independently from the appropriate geochemical data.

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More information

Published date: 15 February 2009
Keywords: melt composition, continental margin, rifting

Identifiers

Local EPrints ID: 64930
URI: http://eprints.soton.ac.uk/id/eprint/64930
ISSN: 0012-821X
PURE UUID: 5c7032c6-8bc0-4333-9a14-feba2ef3cf67
ORCID for T.A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379
ORCID for T.J. Henstock: ORCID iD orcid.org/0000-0002-2132-2514

Catalogue record

Date deposited: 23 Jan 2009
Last modified: 17 Jul 2017 14:11

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Contributors

Author: S.M. Dean
Author: B.J. Murton
Author: T.A. Minshull ORCID iD
Author: T.J. Henstock ORCID iD
Author: R.S. White

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