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History and movement picture of the Onikobe-Yuzawa mylonite zone

鬼部汤泽糜棱岩带的历史与动态图

基本信息

批准号：
09640538
负责人：
OHTOMO Yukiko
金额：
$ 1.6万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640538/
关键词：
the Onikobe-Yuzawa mylonite zone ductile shear zone fault fault rocks history of fault zone 鬼首-湯沢マイロナイト帯

项目摘要

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.

鬼部-汤泽糜棱岩带是在糜棱岩化花岗岩上发现的，该花岗岩从宫城县西北部的鸣子水坝到秋田县汤泽市东部，沿西北-南东南方向延伸约45公里。通过对鸣子坝地区、鲫泽地区、大森地区、府本泽地区断层岩的地质和构造调查与分析，将鬼部-汤泽糜棱岩带及其断裂历史总结如下：这是一个半翼宽数百米的左旋韧性剪切带。糜棱岩化是白垩纪花岗岩侵入后发生的。糜棱岩化花岗岩被约 52 Ma 英闪长岩侵入。此后，远离糜棱岩带中心的地方发生了小规模的碎裂作用。中新世之后，沿 Onikobe-Yuzawa 乙烯基岩带方向形成高角度断层。推测52 Ma英闪长岩侵入后，鬼部-汤泽糜棱岩带未发生明显的断层活动。已制备了一些断层岩制样装置，并进行了多次试验。提出了一些技术对于断层岩，特别是软和/或特软和/或弱断层岩和断层泥的样品制备是有效的。还对自然断层发育的沉积相进行了描述，利用实验室的一些变形实验装置收集实验数据以确定断层的力学行为和岩石圈的强度剖面。