Mise en place et evolution magmatique des complexes plutoniques de la caldera de Courbet, ile Kerguelen (T.A.A.F.)

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Abstract
The two plutonic intrusions of the caldera of the Courbet Peninsula in Kerguelen Island present different styles of emplacement and trends of differentiation. In the Montagnes Vertes intrusion, which illustrates a cauldron subsidence process of emplacement, the petrographic evolution is centripetal; it evolves gradually from outer basic rocks to differentiated rocks in the core, following an alkaline and weakly silica undersaturated trend. In the Mamelles intrusion, which shows good evidence of diapirism, the differentiates are silica-saturated or oversaturated and overlay the basic rocks. Such evolution is consistent with amphibole fractionation and this process suggests an intense water/magma interaction. (Auth.)

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