日本列島の基盤構造と活断層の形成位置との関係に関する基礎的研究

为了证明活动断裂与基底构造的关系，尤其是与基底构造的关系。在古韧性断裂和脆性断裂的基础上，对构造抬升为Ryoke变质带的地壳深部的剪切面进行了研究和分析，并在地壳剖面的逆冲断层上明显叠加了一套活动断裂系统。研究区域是雅瓦达-大岛岛。2)Ryoke变质带和田-三久保地区；3)松山以南的川内。1)在Yawatahama-Oshima岛的高级变质冲断片层中，花岗闪长岩片麻岩中广泛发育假英安质岩脉，集中在三个脆性断裂带中。片麻岩在假玄武岩之前经历了两期韧性剪切和一期脆性剪切，在假玄武岩之后经历了一期韧性剪切和脆性剪切。假玄武岩矿脉与Y、R1、P等尖滑移面共生，产出与…成高角更多的滑动面。主滑裂面(Y)平行于第一阶段原有的糜棱岩面理，切割出很窄的碎裂脉。在逆冲片的底部，假玄武岩脉部分以韧性方式变形；脉内的围岩碎屑变形为透镜状，石英具有优先的晶格取向，玻璃重结晶为亚微观云母和不透明矿物，与围岩中的剪切面平行。2)在Ryoke带的底部，尖锐的滑动面与强烈的糜棱岩面理一般平行。日本中部和田-三久保地区的一个裸露的地壳深部。底部逆冲断层向西北方向缓缓倾斜，并被一条被称为中线构造线的活动断层切割。活动断裂与前述的Ryoke带逆冲断层或脆性断裂无关。3)这一结论也得到了川内地区一条活动断裂的Geld追踪的支持。松山，它是MTL活动断裂系统的一部分。活动断裂一直被认为延伸到Ryoke带的底部逆冲推覆，但在这一地区并非如此。较少

In order to prove the relationships between active faults and the basement strcutures, especially. ancient ductile and brittle faults, we have investigated and analyze shear planes in a deep crustal section tectonically uplifted as the Ryoke metamorphic belt, and an active fault system apparently superposed on the thrust fault of the crustal section. The study areas are 1) Yawatahama-Oshima island. 2) Wada-Misakubo region of the Ryoke metamorphic belt, and 3) Kawauchi, south to Matsuyama.1) In the high-grade metamorphic thrust sheet of the Yawatahama-Oshima island, pseudotachylite veins are extensively developed in granodioritic gneisses, concentrated in three zones of brittle fault. : The gneisses have suffered two stages of ductile shearing and one stage of brittle before pseudotachylite, and one stage each of ductile shearing and of brittle shearing after pseudotachylite. The pseudotachylite veins associate with sharp slip planes such as Y, R1 and P, and fructures high angle to the … More slip planes. The main slip planes (Y) are parallel to the pre-existing mylonite foliation of first stage, and cut very narrow cataclastic veins. At the base of the thrust sheet, pseudotachylite veins are partly deformed in a ductile manner ; country rock fragments within veins deform to lenticular shape, quartz has preferred lattice orientations and glass are recrystallised to submicroscopic mica and opaque minerals, oriented parallel to shear planes in country rocks.2) Sharp slip planes are generally parallel with strong mylonite foliations in the basal part of the Ryoke belt. an exposed deep crustal section, in the Wada-Misakubo area, central Japan. The basal thrust gently dips northwestward, and cut by an active fault, known as the Median Tectonic Line. The active fault is not related to the foregoing thrust or brittle faults in the Ryoke belt.3) The conclusion is also supported by geld tracing of an active fault in the Kawauchi area, south to. Matsuyama, which is a part of the MTL active fault system. The active fault has been considered to marge into tha basal thrust of the Ryoke Belt, but it is not the case in this area. Less