EMPIRICAL GARNET-MUSCOVITE GEOTHERMOMETRY IN METAPELITES
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dc.contributor.author | Wu C.M. | |
dc.contributor.author | Wang X.S. | |
dc.contributor.author | Yang C.H. | |
dc.contributor.author | Geng Y.S. | |
dc.contributor.author | Liu F.L. | |
dc.date.accessioned | 2021-04-17T04:18:57Z | |
dc.date.available | 2021-04-17T04:18:57Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1071473 | |
dc.identifier.citation | Lithos, 2002, 62, 1-2, 1-13 | |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27986 | |
dc.description.abstract | Two empirical garnet-muscovite geothermometers, assuming no ferric iron (Model A) and 50% ferric iron (Model B) in muscovite, respectively, were calibrated under the physical conditions of P=3.0-14.0 kbar and T=530-700 °C. The input temperatures and pressures were determined by simultaneously applying the garnet-biotite thermometer [Am. Mineral. 85 (2000) 881.] and the GASP geobarometer [Am. Mineral. 86 (2001) 1117.] to natural metapelites. To confirm internal thermodynamic consistency, Holdaway's [Am. Mineral. 85 (2000) 881.] garnet mixing properties were adopted. Muscovite was treated as a symmetric Fe-Mg-AlVI ternary solid solution, and its Margules parameters were derived in this work. The resulting two formulae reproduced the input garnet-biotite temperatures well within +/-50 °C, and gave identical results for a great body of natural samples. Moreover, they successfully distinguished the systematic changes of temperatures of different grade rocks from a prograde sequence, inverted metamorphic zone, and thermal contact aureole. Pressure estimation has almost no effect on the two formalisms of the garnet-muscovite geothermometer. Assuming analytical error of +/-5% for the relevant components of both garnet and muscovite, the total random uncertainty of the two formulations will generally be within +/-5 °C. The two thermometers derived in this work may be used as practical tools to metamorphic pelites under the conditions of 480 to 700 °C, low- to high-pressure, in the composition ranges Xalm=0.51-0.82, Xpyr=0.04-0.22, and Xgros=0.03-0.24 in garnet, and Fetot=0.03-0.17, and Mg=0.04-0.14 atoms p.f.u. in muscovite. | |
dc.subject | GARNET-MUSCOVITE THERMOMETRY | |
dc.subject | FERRIC IRON | |
dc.subject | CALIBRATION | |
dc.subject | RANDOM ERROR | |
dc.title | EMPIRICAL GARNET-MUSCOVITE GEOTHERMOMETRY IN METAPELITES | |
dc.type | Статья |
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