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• Soit la réaction :PRINCIPE DE BASE DE LAGEOTHERMOBAROMETRIE2CaMgSi 2 O 6 (cpx) + Fe 2 SiO 4 (ol)↔ 2CaFeSi 2 O 6 (cpx) + Mg 2 SiO 4 (ol)• Nous pouvons calculer :∆ r G° = 2∆ f G° CaFeSi2 O 6+ ∆ f G° Mg2 SiO 4- 2∆ f G° CaMgSi2 O 6- ∆ f G° Fe2 SiO 4
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