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

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

doi:10.1016/S1631-0713(02)01771-6

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 journal › Article › peer-review

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.

Translated title of the contribution	Ultramafic xenoliths from Quaternary alkali volcanism from Oranie (Tell, western Algeria): Witnesses of a sheared and enriched lithosphere
Original language	French
Pages (from-to)	387-394
Number of pages	8
Journal	Comptes Rendus Geoscience
Volume	334
Issue number	6
DOIs	https://doi.org/10.1016/S1631-0713(02)01771-6
Publication status	Published - 2002
Externally published	Yes

Keywords

Algeria
Lithospheric thinning
Mantle metasomatism
Oranie
Upper mantle
Xenoliths

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10.1016/S1631-0713(02)01771-6

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title = "Les x{\'e}nolites ultramafiques du volcanisme alcalin quaternaire d'Oranie (Tell, Alg{\'e}rie occidentale), t{\'e}moins d'une lithosph{\`e}re cisaill{\'e}e et enrichie",

abstract = "Numerous ultramafic xenoliths occur within the A{\"i}n-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.",

keywords = "Algeria, Lithospheric thinning, Mantle metasomatism, Oranie, Upper mantle, Xenoliths",

author = "Mohamed Zerka and Cottin, \{Jean Yves\} and Michel Gr{\'e}goire and Lorand, \{Jean Pierre\} and M'Hamed Megartsi and Mohamed Midoun",

year = "2002",

doi = "10.1016/S1631-0713(02)01771-6",

language = "French",

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pages = "387--394",

journal = "Comptes Rendus Geoscience",

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AU - Zerka, Mohamed

AU - Cottin, Jean Yves

AU - Grégoire, Michel

AU - Lorand, Jean Pierre

AU - Megartsi, M'Hamed

AU - Midoun, Mohamed

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

KW - Algeria

KW - Lithospheric thinning

KW - Mantle metasomatism

KW - Oranie

KW - Upper mantle

KW - Xenoliths

UR - https://www.scopus.com/pages/publications/17544385543

U2 - 10.1016/S1631-0713(02)01771-6

DO - 10.1016/S1631-0713(02)01771-6

M3 - Article

AN - SCOPUS:17544385543

SN - 1631-0713

VL - 334

SP - 387

EP - 394

JO - Comptes Rendus Geoscience

JF - Comptes Rendus Geoscience

IS - 6

ER -

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

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Keywords

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