作者： J. Desmons
DOI:
关键词: Paragonite 、 Metamorphism 、 Eclogite 、 Greenschist 、 Geochemistry 、 Schist 、 Basement (geology) 、 Proterozoic 、 Geology 、 Phengite
摘要: Microprobe chemical analyses have been performed on Alpine and pre-Alpine minerals from the internal Brianconnais basement units, i.e. ancient (pre-Alpine polymetamorphic) younger (where no metamorphism is detected). The analyzed are : garnet, muscovite, phengite, paragonite, Ca Na-pyroxene, chlorite, biotite, others. P-T conditions of each metamorphic phase estimated experimental mineral stability curves element distributions. On basis petrological observations available chronological data facies succession appears to be following Proterozoic eclogite, (?-Early Cambrian) amphibolite I II, (? late Variscan) H-T greenschist, glaucophane-epidote or glaucophane-lawsonite schists, greenschist II