Les xénolites ultramafiques du volcanisme alcalin quaternaire d'Oranie (Tell, Algérie occidentale), témoins d'une lithosphère cisaillée et enrichie

Translated title of the contribution: Ultramafic xenoliths from Quaternary alkali volcanism from Oranie (Tell, western Algeria): Witnesses of a sheared and enriched lithosphere

Mohamed Zerka, Jean Yves Cottin, Michel Grégoire, Jean Pierre Lorand, M'Hamed Megartsi, Mohamed Midoun

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Numerous ultramafic xenoliths occur within the Aïn-Temouchent volcanic complex (Northwestern Oranie, Algeria). Most of them are type I mantle tectonites (lherzolites and harzburgites) and composite xenoliths (harzburgite/clinoproxenite) are rare. Only a few samples of spinel lherzolites display relatively fertile compositions when the major part of type I xenoliths have refractory major element compositions but enriched LREE contents showing that they have been affected by mantle metasomatism. The composite xenoliths are witnesses of reactions of alkaline magmas with the upper mantle. An asthenospheric rising, in relation with the large strike slip fault affecting the North African plate margin at Trias time is proposed as a possible geodynamical setting. To cite this article: M. Zerka et al., C.R. Geoscience 334 (2002) 387-394.

Original languageFrench
Pages (from-to)387-394
Number of pages8
JournalComptes Rendus Geoscience
Volume334
Issue number6
DOIs
Publication statusPublished - 2002
Externally publishedYes

Keywords

  • Algeria
  • Lithospheric thinning
  • Mantle metasomatism
  • Oranie
  • Upper mantle
  • Xenoliths

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