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Co-operative research of granite mylonites in Japan

日本花岗岩糜棱岩合作研究

基本信息

批准号：
02304011
负责人：
HARA Ikuo
金额：
$ 0.83万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

In this co-operative research have been performed descriptions of granite mylonites in Japan and their formation processes and tectonics have been discussed. Granite mylonites are developed as large-scale zones in the Hida belt, Ryoke belt, Abukuma-Kitakami belt, Hidaka belt and Greentuff belt as magma-arcs. They are zones of strain concentration in magma-arcs. In order to understand tectonic of magma-arcs, therefore, it is very important to clarify formation processes and movement pictures of large-scale granite mylonite zones. Granite mylonite zone in the Hida belt has been studied by Komatsu (1992) and Hara (1992) clarifying that it was developed during two phases, Unazuki phase for tectonics related to the uplifting of medium P/T type schists and Hunatsu phase for tectonics related to the intrusion of Hunatsu granites. Large-scale mylonite zone in the Ryoke belt, which is placed along the Median Tectonic Line, has been studied by Ui and Yokoyama (1992), Takagi (1992), Hara (1992) a … More nd Takeshita (1992) clarifying that it was developed as a flat-lying shear zone. Its movement picture has bee analyzed during the period from the phase of Cretaceous granite intrusion to the phase of the Japan-sea spreading. Large-scale mylonite zones in the Abukuma-Kitakami belt have been studied by Koshiya (1992) and Hara (1992), clarifying that they were developed as upright shear zones with horizontal shear unlike the case of the Ryoke belt, though the shear zones in both belts are of the same generation. Large-scale mylonite zone in the Hidaka belt has been studied by Toyoshima (1992) and Toyoshima and Hara (1990), clarifying that it was developed as flat-lying shear zone during two phases, phase of intrusion of MORB type magma and phase of intrusion of calcalkaline magma, and then the shear zone with igneous intrusion was moved into upright attitude giving rise to great mylonite zone (Hidaka western margin mylonite zone). Mylonite zone in the greentuff belt is developed along the Itoigawa-Shizuoka tectonic line. Its microtextures and movement picture have been analyzed by Kosaka and Takizawa (1992), Takizawa and Kosaka (1992) and Shimamoto (1992). Microtextures, formation processes, movement pictures andstress estimation of mylonites have been discussed by Masuda et al. (1992), Takizawa and Kosaka (1992), Hara et al. (1992), Kang et al. (1992), Koshiya (l992) and Simamoto (1992). Less

本文对日本的花岗岩糜棱岩进行了描述，并对其形成过程和构造进行了讨论。花岗质糜棱岩以岩浆弧的形式在希达带、良屋带、Abukuma-Kitakami带、日高带和绿凝灰岩带大规模发育。它们是岩浆弧中的应变集中区。因此，弄清大型花岗岩糜棱岩带的形成过程和运动图象，对认识岩浆弧构造具有重要意义。Komatsu（1992）和Hara（1992）对希达带中的花岗岩糜棱岩带进行了研究，阐明了它是在两个阶段中发育的，即与中等P/T型片岩的隆升有关的构造的Unazuki阶段和与Hunatsu花岗岩的侵入有关的构造的Hunatsu阶段。Ui和Yokoyama（1992）、Takagi（1992）、Hara（1992）等研究了沿着中央构造线分布的柳轭带中的大型糜棱岩带。 ...更多信息 and Takeshita（1992）阐明了它是作为一个平坦的剪切带而发展的。分析了从白垩纪花岗岩侵入期到日本海扩张期的运动图象。Koshiya（1992）和Hara（1992）对Abukuma-Kitakami带中的大型糜棱岩带进行了研究，阐明了它们与Ryoke带的情况不同，是作为具有水平剪切的直立剪切带发育的，尽管这两个带中的剪切带是同一世代的。丰岛（1992）和丰岛和原（1990）对日高带中的大型糜棱岩带进行了研究，阐明了它是在MORB型岩浆侵入阶段和钙碱性岩浆侵入阶段两个阶段中作为平卧剪切带发育的，剪切带与岩浆侵入体一起向直立方向移动，形成大糜棱岩带（日高西缘糜棱岩带）。绿凝灰岩带中的糜棱岩带沿着丝鱼川-静冈构造线发育。其显微结构和运动图像由Kokuo和Takizawa（1992）、Takizawa和Kokuo（1992）和Shimamoto（1992）分析。增田等（1992）、Takizawa和Koshi（1992）、Hara等（1992）、Kang等（1992）、Koshiya（1992）和Simamoto（1992）讨论了糜棱岩的显微结构、形成过程、运动图像和应力估算。少