Characterization of the metasomatic agent in mantle xenoliths from Devès, Massif central (France) using couple in situ trace-element and O, Sr and Nd isotopic compositions

Stephanie Touron*, C. Renac, S. Y. O'Reilly, J. Y. Cottin, W. L. Griffin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

18 Citations (Scopus)

Abstract

Spinel lherzolites and harzburgites from Mont-Briançon and Marais de Limagne in the Devès volcanic district display coarse-grained to porphyroclastic microstructures and the modal content of volatile-bearing phases increases with the degree of deformation. Clinopyroxene and/or spinel are partly or totally reacted to amphibole. The coupled interpretations of trace-element, rare earth element (REE) and O-Sr-Nd data for clinopyroxene and amphibole indicate that the metasomatized mantle beneath Devès is a mixture of depleted and enriched mantle associated with an alkaline, high field strength element poor, and light rare earth element, U- and Th-rich carbonate-rich silicate fluid-melt metasomatic agent. Oxygen isotope and REE data for clinopyroxene-amphibole pairs indicate a (La/Yb)N enrichment related to an increasing metasomatic agent/rock ratio.

Original languageEnglish
Title of host publicationMetasomatism in oceanic and continetal lithospheric mantle
EditorsM Coltorti, M Gregoire
Place of PublicationLondon
PublisherThe Geological Society Publishing House
Pages177-196
Number of pages20
Volume293
Edition1
ISBN (Print)9781862392427
DOIs
Publication statusPublished - 2008

Publication series

NameGeological Society Special Publication
Volume293
ISSN (Print)03058719

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