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REACTION D’ECHANGE Fe-Mgentre grenats et biotitesGEOTHERMOMETRE• Elle est basée sur la réactionFe 3 Al 2 Si 3 O 12 + KMg 3 AlSi 3 O 10 (OH) 2 ↔ Mg 3 Al 2 Si 3 O 12 + KFe 3 AlSi 3 O 10 (OH) 2alm<strong>an</strong>din phlogopite pyrope <strong>an</strong>nite• A l’équilibre:

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