Les phases precoces et profondes du magmatisme des iles Kerguelen revelees par les enclaves basiques et ultrabasiques

Translated title of the contribution: The initial deep steps of Kerguelen magmatism revealed from basic and ultrabasic xenoliths

M. Gregoire, H. Leyrit, J. Y. Cottin, A. Giret, N. Mattielli

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Numerous basic and ultrabasic xenoliths have been discovered within volcanic formations of the Kerguelen Islands. Three groups can be distinguished according to their textural features: 1) mantle xenoliths (residual harzburgites); 2) the ultrabasic and basic xenoliths with relics of magmatic textures; 3) crustal magmatic xenoliths. The two pyroxene-Al spinel xenoliths from type (2) could belong to cumulative series fractionated from an aluminous basalt (transitional?) in the conditions of crust-mantle boundary (16-20km) (underplating). Fe-Ri rich and type (3) xenoliths could be alkaline cumulates. There is an abridged English version. -English summary

Original languageFrench
Pages (from-to)1203-1209
Number of pages7
JournalComptes Rendus - Academie des Sciences, Serie II
Volume314
Issue number11
Publication statusPublished - 1992

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