ザクロ石-黒雲母温度計について -三波川変成岩と大文字接触変成岩への適用とその評価- On garnet-biotite geothermometer : -Application to the Sanbagawa and the Daimonji metamorphic rocks and it's evaluation-
Garnet-biotite geothermometer has been used commonly in determining temperatures of metamorphism. Application of some garnet-biotite thermometers to the Sanbagawa and the Daimonji metamorphic rocks reveals that those of Hodges and Spear (1982) and Dasgupta <i>et al</i>. (1991) are the most compatible with other geothermometers and paragenetic relations. Though these thermometers are based on the solid solution model assuming symmetrical mixing, the results from them are consistent with those of Berman's (1990) asymmetrical mixing model for garnet. Therefore, for garnet with X<sub>Ca</sub> < 0.30 and X<sub>Mn</sub> < 0.40 from those areas, the symmetrical model produces not so much different estimated temperatures from the asymmetrical model. Difficulties in evaluation of the effects of Mn in garnet and Ti and Al in biotite on the thermometers remain even now, but these two give reasonable temperatures.
- 岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology
岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology 91(5), 165-176, 1996-05-05
Japan Association of Mineralogical Sciences