Role de l'amphibole des cumulats gabbroiques dans l'eruption de 1982- 83 du Galunggung (Indonesie)

Translated title of the contribution: Role of amphibole in the gabbroic cumulates from the 1982-83 Galunggung eruption Indonesia

M. C. Gerbe, O. Sigmarsson

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Two types of gabbroic cumulates, which are distinguished on the basis of the occurrence or the lack of amphibole, are associated with the andesites of the Galunggung 1982-83 eruption. These cumulates grew at the top of the magma chamber and their amphibole is a result of destabilization reaction of olivine and clinopyroxene under important fluid pressure. Anhydrous fractional crystallization may have oversaturated the magma in volatiles at a rate faster than the hydration reaction at the chamber roof which led to an overpressure that triggered the eruption. There is an abridged English version. -English summary

Translated title of the contributionRole of amphibole in the gabbroic cumulates from the 1982-83 Galunggung eruption Indonesia
Original languageFrench
Pages (from-to)85-91
Number of pages7
JournalComptes Rendus - Academie des Sciences, Serie II
Volume312
Issue number1
Publication statusPublished - 1991

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