History and movement picture of the Onikobe-Yuzawa mylonite zone

在从宫城县西北部的鸣子大坝到秋田县汤泽市东部的NNW-SSE方向延伸约45 km的糜棱岩化花岗岩上发现了鬼兵部-汤泽糜棱岩带。通过对鸣子坝地区、Sabusawa地区、Omori地区和Fumotozawa地区断层岩的地质和构造调查及分析，总结了鬼子部-汤泽糜棱岩带及其断裂历史。糜棱岩化发生在白垩纪花岗岩侵入之后。糜棱岩化花岗岩被侵入约52 Ma英云闪长岩。此后，在远离糜棱岩带中心的地方发生了规模较小的碎裂作用。中新世以后，在鬼子部-汤泽一带形成高角度断层。认为在52 Ma英云闪长岩侵入后，沿鬼子部-汤泽糜棱岩带没有明显的沿着断裂活动。指出了断层岩、特软和/或特软和/或弱断层岩和断层泥的有效制样技术，天然断裂发育的沉积相描述，实验室形变实验装置的实验数据收集，确定断层力学行为和岩石圈强度剖面。

The Onikobe-Yuzawa mylonite zone was discovered on mylonitized granitic rocks which extended in NNW-SSE direction for approximately 45 km from Naruko Dam in northwestern part of Miyagi Prefecture to eastern part of Yuzawa City, Akita Prefecture. Based on geologic and structural investigation and analysis of fault rocks in the Naruko Dam area, the Sabusawa area, the Omori area and the Fumotozawa area, the Onikobe-Yuzawa mylonite zone and Its history of faulting is summarized as follows, This is a left lateral ductile shear zone with several hundred meters wide in a half wing. Mylonitization was occurred after the intrusion of Cretaceous granites. The mylonitized granite was intruded by approximately 52 Ma tonalite. After that, cataclasis occurred far from the center of the mylonite zone in small scale. After Miocene, high angle faults formed across the direction of the Onikobe-Yuzawa inylonite zone. It is suggested that no distinguished faulting along the Onikobe-Yuzawa mylonite zone occurred after the intrusion of 52 Ma tonalite.Some apparatus for sample preparation of fault rocks have been prepared and several test have been done. It is suggested that some techniques are effective on sample preparation of fault rocks, especially soft and/or especially soft and/or weak fault rocks and faultgouges.It have been also done the descriptions of sedimentary facies developed on natural faulting, the collection of experimental data using some deformation experimental apparatus in laboratory to determine mechanical behavior of fault and strength profile of the lithosphere.