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Journal of Petrology Advance Access published online on September 21, 2006
Journal of Petrology, doi:10.1093/petrology/egl047
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received November 27, 2005
Accepted August 15, 2006

Article

Recalibration of the Garnet-Muscovite (GM) Geothermometer and the Garnet-Muscovite-Plagioclase-Quartz (GMPQ) Geobarometer for Metapelitic Assemblages

CHUN-MING WU 1 * and GUOCHUN ZHAO 2

1 LABORATORY OF COMPUTATIONAL GEODYNAMICS, THE GRADUATE SCHOOL, CHINESE ACADEMY OF SCIENCES, P.O. BOX 4588, BEIJING 100049, CHINA; DEPARTMENT OF EARTH SCIENCES, THE UNIVERSITY OF HONG KONG, POKFULAM ROAD, HONG KONG, CHINA
2 DEPARTMENT OF EARTH SCIENCES, THE UNIVERSITY OF HONG KONG, POKFULAM ROAD, HONG KONG, CHINA

* To whom correspondence should be addressed.
CHUN-MING WU, E-mail: wucm{at}gucas.ac.cn


  Abstract

The garnet-muscovite (GM) geothermometer and the garnet-muscovite-plagioclase-quartz (GMPQ) geobarometer have been simultaneously calibrated under conditions of T = 450-760°C and P = 0·8-11·1 kbar, using a large number of metapelitic samples in the compositional ranges XFegrt = 0·53-0·81, XMggrt = 0·05-0·24, XCagrt = 0·03-0·23 in garnet, XCapl = 0·17-0·74 in plagioclase, and Fe = 0·04-0·16, Mg = 0·04-0·13, AlVI = 1·74-1·96 in muscovite on the basis of 11 oxygens. The resulting GM thermometer yielded similar temperature estimates (mostly within ±50°C) to that of the garnet-biotite thermometer, and successfully discerned the expected systematic temperature change of prograde sequences, thermal contact zones and an inverted metamorphic zone. The resulting GMPQ barometer yielded similar pressure estimates (mostly within ±1·0 kbar) to the garnet-aluminum silicate-plagioclase-quartz (GASP) barometer and placed the aluminosilicate-bearing samples in the appropriate aluminosilicate stability fields. Application of the GMPQ barometer to thermal contact aureoles or rocks within limited geographical areas confirmed the expected constant pressures that should exist in these settings. The random errors of the GM thermometer and the GMPQ barometer are estimated to be ±16°C and ±1·5 kbar, respectively. When biotite or aluminosilicate is absent in metapelites, metamorphic P-T conditions may be determined by simultaneously applying the GM thermometer and the GMPQ barometer.

Keywords: application; calibration; geobarometer; geothermometer; metapelite.
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