Abstract
The garnet-muscovite geothermometer and garnet-muscovite-Al2SiO5-quartz (GMAQ) geobarometer have been empirically calibrated under P-T conditions of 1–12 kbar and 460–760 ºC using natural metapelitic rocks. The chemical compositions of the calibrant muscovite are in the ranges of Fe=0.03–0.21 atoms, Mg=0.02–0.32 atoms and AlVI=1.62–1.96 atoms, respectively, on the 11-oxygen basis per formula unit. The garnet-muscovite thermometer yields similar temperature estimates to the well calibrated garnet-biotite thermometer within error of ±55 °C, and successfully discriminates the systematic temperature change of the different zones of either the prograde or inverted metamorphic terranes or thermal contact aureoles. The six formulations of GMAQ barometry yield similar pressure estimates to the well calibrated GASP barometer within error of ±1.2 kbar, and plot the Al2SiO5-bearing metapelite into the correct stability field of the Al2SiO5 polymorphs. Moreover, the GMAQ thermobarometers show that the pressure is almost constant for every thermal contact aureole within limited geographic region, which reflects geological condition. The random errors are estimated to be of ca. ±60 °C and ±1.4 kbar for the geothermometer and geobarometer, respectively. A spreadsheet for applying GMAQ geothermobarometry is supplied in the Electronic Supplementary Materials.
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The quality of this paper has been improved through reviews by two referees. This research was supported by the Key Research Program of Frontier Sciences of Chinese Academy of Sciences (No. QYZDJ-SSW-DQC036) and the National Natural Science Foundation of China (No. 41730215). This paper is in honour of Prof. Zhendong You (China University of Geosciences, Wuhan) dedicated to his contributions to metamorphic geology on his 90th birthday. The final publication is available at Springer via https://doi.org/10.1007/s12583-018-0851-z.
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Table S2.
Expressions in constructing excess chemical potentials of garnet solid solution
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Wu, CM. Metapelitic Garnet-Muscovite-Al2SiO5-Quartz (GMAQ) Geothermobarometry. J. Earth Sci. 29, 977–988 (2018). https://doi.org/10.1007/s12583-018-0851-z
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DOI: https://doi.org/10.1007/s12583-018-0851-z