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Univ. Calif., Inst. Geophys. and Planet. Phys., Los Angeles, CA, United States
A new mineralogic geobarometer for peraluminous rocks based on assemblages of ilmenite-Al 2 SiO 5 -quartz-garnet-rutile has been calibrated from the equilibrium relation: 3 ilmenite + sillimanite + 2 quartz <--> almandine + 3 rutile. The reaction boundary was located (+ or -0.2 kbar) using piston-cylinder apparatus at 11.5, 12.0, 12.5, 13.1, 14.6, 15.3 and 15.9 kbar at 750, 800, 850, 900, 1000, 1050, and 1000 degrees C, respectively. The geobarometer is widely applicable as the univariant assemblage occurs in numerous terranes spanning middle amphibolite to garnet-granulite facies metamorphic rocks. Pressure calculated for several terranes are consistent with the appropriate Al 2 SiO 5 polymorph(s) and are generally in agreement with other well-calibrated geobarometers subject to choice of mixing properties for Fe-Ca-Mg-Mn garnets.--Modified journal abstract.
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