Nature du manteau supérieur et processus métasomatiques de part et d'autre du Sillon Mouiller (Massif Central)

Translated title of the contribution: Nature of the upper mantle and metasomatic processes on either side of the Sillon Mouiller (French Massif Central)

Olivier Alard*, Jean Marie Dautria, Jean Louis Bodinier

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Peridotite xenoliths collected in two Mio-Pliocene volcanoes on either side of the Sillon Mouiller (French Massif Central) have contrasting characteristics. East of the Sillon Mouiller, the peridotites record anomalously high temperatures (1,250°C) and extensive reequilibration with basaltic melts. To the west, equilibrium temperatures are much lower (950"C) and the peridotites bear evidence for interaction with volatile-rich small melt fractions. In agreement with seismic tomographic data, these results indicate that the Massif Central lithospheric mantle is strongly affected by mantle plume upwelling to the east of the Sillon Mouiller, while this effect is moderate to the west.

Original languageFrench
Pages (from-to)763-770
Number of pages8
JournalComptes Rendus de l'Academie de Sciences - Serie IIa: Sciences de la Terre et des Planetes
Volume323
Issue number9
Publication statusPublished - 1996
Externally publishedYes

Keywords

  • French Massif Central
  • Metasomatism
  • Sillon Mouiller
  • Trace element
  • Upper mantle

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