de Louvain; place Louis Pasteur, 3, B-1348 Louvain-la-Neuve, Belgi~ara. In progressive metamoq~hism biotite...M i c r o c l i n e ~ Biotite + Calcite 4. CO 2 (la) (Thompson & Norton 1968). In each of these two...lVlontmorillonite, Prm= Phengite, AN = Anorthite, Z o = Zoisite, Cn = Chlorite, BIo=: Biotite. pelitic and calco-pelitic... Serpont 4 and 9, Freux 5, 6, 7, 10 and lll, La Mouline 8. 1 - minerals analysed under the microprobe...decarbonation reaction: A northi re + Calcite--> Zoisite + CO 2 (6) In this ,zase decalcitization proceeds |