1:45 PM - 3:15 PM
[O08-P40] Comparison of Hydrothermal Residual Circulation at the Magma Differentiation
Keywords:San’yo belt, San’in belt, Hydrothermal Residual, Dehydration and Degassing, Oscillatory Zoned Structure
The Oscillatory Zoned Structure developed in the granitoid amphiboles of the magnetite-affiliated San’in belt of southwestern Japan leaves traces of magma dehydration and degassing. On the other hand, since no Oscillatory Zoned Structure has been found in the granitoid amphiboles of the titanite-affiliated San’yo belt, it is not known whether the structure of amphiboles are an indicator of magma dehydration and degassing.
In this study, the authors discovered an Oscillatory Zoned Structure in amphiboles of the San’yo Ibogawa grandiorite, and based on this structure, we clarified that magma dehydration and degassing occurred at the end of the magmatic process, resulting in an oxidative environment. The San'in belt was an oxidative environment due to early magma dehydration and degassing. The Oscillatory Zoned Structure of amphiboles are an indicator of magma dehydration and degassing.
In this study, the authors discovered an Oscillatory Zoned Structure in amphiboles of the San’yo Ibogawa grandiorite, and based on this structure, we clarified that magma dehydration and degassing occurred at the end of the magmatic process, resulting in an oxidative environment. The San'in belt was an oxidative environment due to early magma dehydration and degassing. The Oscillatory Zoned Structure of amphiboles are an indicator of magma dehydration and degassing.