The Open UniversitySkip to content
 

Variations in melt productivity and melting conditions along SWIR (70°E-49°E): evidence from olivine-hosted and plagioclase-hosted melt inclusions

Font, L; Murton, B. J.; Roberts, S and Tindle, A. G. (2007). Variations in melt productivity and melting conditions along SWIR (70°E-49°E): evidence from olivine-hosted and plagioclase-hosted melt inclusions. Journal of Petrology, 48(8) pp. 1471–1494.

Full text available as:
Full text not publicly available
Due to copyright restrictions, this file is not available for public download
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1093/petrology/egm026
Google Scholar: Look up in Google Scholar

Abstract

Melt inclusion and host glass compositions from the eastern end of the Southwest Indian Ridge show a progressive depletion in light rare earth elements (LREE), Na8 and (La/Sm)n, but an increase in Fe8, from the NE (64°E) towards the SW (49°E). These changes indicate an increase in the degree of mantle melting towards the SW and correlate with a shallowing of the ridge axial depth and increase in crustal thickness. In addition, LREE enrichment in both melt inclusions and host glasses from the NE end of the ridge are compatible with re-fertilization of a depleted mantle source. The large compositional variations (e.g. P2O5 and K2O) of the melt inclusions from the NE end of the ridge (64°E), coupled with low Fe8 values, suggest that melts from the NE correspond to a variety of different batches of melts generated at shallow levels in the mantle melting column. In contrast, the progressively more depleted compositions and higher Fe8 values of the olivine- and plagioclase-hosted melt inclusions at the SW end of the studied region (49°E), suggest that these melt inclusions represent batches of melt generated by higher degrees of melting at greater mean depths in the mantle melting column. Systematic differences in Fe8 values between the plagioclase- and the olivine-hosted melt inclusions in the SW end (49°E) of the studied ridge area, suggest that the plagioclase-hosted melt inclusions represent final batches of melt generated at the top of the mantle melting column, whereas the olivine-hosted melt inclusions correspond to melts generated from less depleted, more fertile mantle at greater depths.

Item Type: Journal Article
Copyright Holders: 2007 Oxford University Press
ISSN: 0022-3530
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 14952
Depositing User: Elizabeth Lomas
Date Deposited: 23 Feb 2009 15:22
Last Modified: 06 Dec 2010 13:22
URI: http://oro.open.ac.uk/id/eprint/14952
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk