Magmatic garnet-bearing mafic xenoliths (Puy Beaunit, French Massif Central): P-T path from crystallisation to exhumation
作者： Julien Berger , Olivier Féménias , Nicolas Coussaert , Daniel Demaiffe
DOI: 10.1127/0935-1221/2005/0017-0687
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摘要: Mafic xenoliths, sometimes interlayered with magmatic peridotites, are abundant in the scoria cones of Puy Beaunit French Massif Central. These mainly layered gabbronorites some norites, pyroxenites and anorthosites; they probably derive from a Permian differentiated deep intrusion. Crystallisation conditions were estimated at about 1000°C 1 GPa. The rocks underwent sub-solidus re-equilibration 770°C GPa (isobaric cooling) lowermost crust. Two distinct symplectitic textures (pyroxene-plagioclase-spinel intergrowths) have been observed; result destabilization garnet (750-800°C, 0.55-0.8 GPa) amphibole (990°C,
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