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The Current Status of Titanite–rutile Thermobarometry



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Chemical Geology 254 2008 123 132 Contents lists available at ScienceDirect Chemical Geology j o u r n a l h o m e p a g e w w w e l s e v i e r c o m l o c a t e c h e m g e o The current status of titanite rutile thermobarometry in ultrahigh pressure metamorphic rocks The in uence of titanite activity models on phase equilibrium calculations Peter Tropper a b Craig E Manning b a b Institute of Mineralogy and Petrography Faculty of Geo and Atmospheric Sciences University of Innsbruck Innrain 52 A 6020 Innsbruck Austria Department of Earth and Space Sciences Geology Building University of California at Los Angeles Los Angeles CA 90095 1567 USA A R T I C L E I N F O Article history Accepted 12 March 2008 Keywords Titanite Activity model Al F substitution UHP Thermobarometry A B S T R A C T Titanite an important accessory mineral in ultrahigh pressure UHP rocks commonly deviates signi cantly from its ideal composition CaTiSiO4O by the substitution of Al and F OH for Ti for O This compositional variability of titanite could be used in phase equilibrium calculations if the activity composition relations in Al F bearing titanites were suf ciently known Experimental investigations by Troitzsch and Ellis Troitzsch U and Ellis D J 2002 Thermodynamic properties and stability of AlF bearing titanite CaTiOSiO4 CaAlFSiO4 Contributions to Mineralogy and Petrology 142 543 563 and Tropper et al Tropper P Manning C Essene E J 2002 The substitution of Al and F in Titanite at high pressure and temperature experimental constraints on phase relations and solid solution properties Journal of Petrology 43 1787 1814 derived non ideal mixing models for solid solutions along the join CaTiSiO4O CaAlSiO4F Tropper et al Troitzsch U and Ellis D J 2002 Thermodynamic properties and stability of AlF bearing titanite CaTiOSiO4 CaAlFSiO4 Contributions to Mineralogy and Petrology 142 543 563 derived a preliminary regular model in the T range 900 1100 C in which the T dependent interaction parameter



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