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高アルカリ性間隙水の浸入に伴う母岩の変質に関する研究; 花崗岩のアルカリ変質に関する室内実験

An Experimental study of host rock alteration due to hyperalkaline pore water

山口 耕平; 小田 治恵  ; 中澤 俊之*; 山田 憲和*; 高瀬 敏郎*

Yamaguchi, Kohei; Oda, Chie; Nakazawa, Toshiyuki*; Yamada, Norikazu*; Takase, Toshio*

本研究では、花崗岩と模擬高アルカリ間隙水のバッチ浸漬実験及びカラム通水実験を行い、主要な地球化学反応について検討を行った。バッチ浸漬実験結果に基づき、化学平衡計算により飽和指数の経時変化を計算した。計算結果に基づき液相中から沈殿している可能性がある二次鉱物を抽出し、その組合せを検討した。さらに、カラム通水実験結果にこの二次鉱物の組合せを適用し二次鉱物の空間的な分布及びカラム通水後の液相組成について実験結果と地球化学計算(PHREEQC)結果を比較した。その結果、今後は二次鉱物の沈殿速度に着目しつつ主要な地球化学反応を理解していく必要があることがわかった。

In this research, the batch immersion experiment and the flow-through column experiment of granite and the artificial highperalkaline pore water were conducted, and the main geochemistry reaction was examined. A change with the lapse of time of the saturation index was calculated by the chemical equilibrium computation based on the batch immersion experiment result. The secondary mineral with the possibility of precipitation in the liquid phase based on the calculation result was extracted, and the combination was examined. In addition, the combination of these secondary minerals was applied to the flow-through column experiment result, and the liquid phase composition after the flow-through and the secondary mineral's spatial distribution were compared with geochemistry calculation (PHREEQC) result. As a result, it has been understood to have to understand the main geochemistry reaction paying attention at the precipitation rate of the secondary mineral in the future.

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