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Original Calibration of a Garnet Geobarometer in Metapelite

College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, China
Minerals 2019, 9(9), 540; https://doi.org/10.3390/min9090540
Received: 29 June 2019 / Revised: 4 September 2019 / Accepted: 5 September 2019 / Published: 6 September 2019
(This article belongs to the Special Issue High- and Ultrahigh-Pressure Rocks)
In many metapelitic assemblages, plagioclase is either CaO-deficient or even absent. In such cases, all the widely applied, well-calibrated plagioclase-related geobarometers lose their usage. Fortunately, it has been found that a net-transfer reaction including intracrystalline Fe2+–Ca2+ exchange in garnet is pressure-sensitive, therefore, a garnet geobarometer can be empirically calibrated under pressure–temperature (P–T) conditions of 430~895 °C and 1~15 kbar. The chemical composition range of the calibrant garnet is XCa = 0.02~0.29 and XFe = 0.42~0.91, and covers the majority of garnet in metapelite. The total error of this geobarometer was estimated to be within ±1.3 kbar. The application of this garnet geobarometer to metamorphic terranes certifies its applicability, and this geobarometer can play a unique role, especially when plagioclase is absent or CaO-deficient. Metamorphic P–T conditions can be simultaneously determined by the garnet–biotite pair through the application of the present garnet geobarometer in combination with a well-calibrated garnet-biotite geothermometer. View Full-Text
Keywords: application; calibration; garnet; geobarometer; metapelite application; calibration; garnet; geobarometer; metapelite
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Wu, C.-M. Original Calibration of a Garnet Geobarometer in Metapelite. Minerals 2019, 9, 540.

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