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

Murton, Bramley J.; Tindle, Andrew G.; Milton, J. Andrew and Sauter, Daniel (2005). Heterogeneity in southern Central Indian Ridge MORB: Implications for ridge–hot spot interaction. Geochemistry Geophysics Geosystems, 6 pp. 1–24.

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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.

Item Type: Journal Item
Copyright Holders: 2005 American Geophysical Union
ISSN: 1525-2027
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 14935
Depositing User: Elizabeth Lomas
Date Deposited: 23 Feb 2009 16:00
Last Modified: 05 Oct 2016 18:48
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