境界変成岩の温度・圧力・脱水量経路と沈み込むプレート境界の力学的結合
2004 年 113 巻 5 号 p. 715-726
詳細
2004 年 113 巻 5 号 p. 715-726
Boundary metamorphic rocks as exemplified by Sanbagawa metamorphic rocks have chemical records accompanied by physical processes in garnet and amphiboles. Garnet showing chemical zoning from core to rim grew during prograde metamorphism, which is the process of boundary rock subduction, and the pressure-temperature-water production rate path can be precisely determined by the modified differential thermodynamic method with the volume fraction of garnet. The results of the paths can be discussed in a dynamic system involving mechanical coupling between slab and arc crust, thermal interaction, and dehydration reaction, suggesting that mechanical coupling is weakend by a dehydration reaction.
