Abstract
An experimentally calibrated geobarometer based on the solubility of alumina in orthopyroxene coexisting with garnet is presented. This geobarometer is based on experiments in the FeO–MgO–Al2O3–SiO2 and CaO–FeO–MgO–Al2O3–SiO2 systems performed at high temperatures and pressures (800–1,200 °C and 5–20 kbar). Applying the geobarometer to a variety of natural garnet–orthopyroxene assemblages from granulite facies terrains and other occurrences, yields reliable and consistent pressure estimates for these samples.
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