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超深地層研究所計画,地質環境特性の長期変遷解析技術に関する研究; 割れ目の形成と充填の履歴

Mizunami Underground Research Laboratory Project, A Study on the long-term evolution analysis technology of geological environment characteristics; History of fracture formation and fracture filling

野原 壯; 酒井 利啓; 村上 裕晃

Nohara, Tsuyoshi; Sakai, Toshihiro; Murakami, Hiroaki

超深地層研究所計画において、地質環境特性の長期変成解析技術に関する研究の一環として、花崗岩中の割れ目の形成と充填の履歴の把握と検討を行った。地熱地帯の岩相や割れ目の特徴を踏まえ、土岐花崗岩において高温流体に伴う割れ目の存在を確認した。また、高温流体に伴う石英の沈殿は、一部の割れ目を閉塞し、透水性を低下させたと推定される。

Research on history of the fracture formation and fracture filling in the Toki granite was carried out, in the Mizunami Underground Research Laboratory (MIU) Project. It is recognized that some fractures in the Toki granite are related to high temperature fluid. Rock permeability was decreased by Quartz precipitations in the fracture which were related to injection of the high temperature fluid.

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