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Heterogeneity in southern Central Indian Ridge MORB: Implications for ridge-hot spot interaction

Murton, B.J., Tindle, A.G., Milton, J.A. and Sauter, D. (2005) Heterogeneity in southern Central Indian Ridge MORB: Implications for ridge-hot spot interaction Geochemistry, Geophysics, Geosystems, 6, Q03E20. (doi:10.1029/2004GC000798).

Record type: Article

Abstract

Between the Rodrigues Triple Junction and the Marie Celeste fracture zone, basalts from the Central Indian Ridge (CIR) exhibit an enrichment in incompatible elements that increases in intensity northward. In addition, H2O/TiO2, Al[8], and Dy/Yb ratios increase, while Na[8] remains unchanged and Fe[8] decreases. Evolution of the enriched magma appears to be affected by elevated water contents, which lower the mantle solidus, thereby increasing the initial depth of melting, as well as delaying plagioclase crystallization. However, the enrichment affecting the northern samples is not a just function of hydrous mantle melting and crystallization. Instead of trending toward a small melt fraction from the mantle, as predicted by hydrous melting models, the CIR samples lie on a mixing line between N-MORB and a source component that closely resembles present-day Réunion hot spot lavas. Thus it appears that while hydrous melting and crystallization affect the CIR, the enriched and wet mantle originates from the Réunion hot spot, where it migrates eastward toward the CIR, against the direction of motion of the lithosphere.

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Published date: 2005
Keywords: Central Indian Ridge, hot spot–ridge interaction, MORB geochemistry

Identifiers

Local EPrints ID: 24032
URI: http://eprints.soton.ac.uk/id/eprint/24032
ISSN: 1525-2027
PURE UUID: 29e3d7d2-5a76-406a-893d-001dacb8c30e

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Date deposited: 17 Mar 2006
Last modified: 17 Jul 2017 16:15

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Contributors

Author: B.J. Murton
Author: A.G. Tindle
Author: J.A. Milton
Author: D. Sauter

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