埼玉県秩父鉱山における割目の生成と鉱化作用
1969 年 85 巻 977 号 p. 765-770
詳細
1969 年 85 巻 977 号 p. 765-770
The ore deposit of the Chichibu mine belongs to pyrometasomatic type.
The formation of the Daikoku fault in the Daikoku ore bodies and of the Akaiwa-toge fault in the Doshinkubo ore bodies was related to the intrusion of quartz diorite. The former is a normal fault caused by magmatic upheaval, and the latter is a hinge fault along the zone where the orientation of the front of magmatic upheavalchanges abruptly. They were important paths of the ore-foming fluid.
Fractures or joints at the eastern periphery of diorite intrusive in the area of Wanaba ore bodies, striking N-S with the dip of 90°were also formed by magmatic upheaval.
Two sets of fractures or joints (N25°W, 80°SW and N55°W, 20°NE) in the inner part of the same intrusive (main adit at 900mL) were formed by the solidification of magma.
