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

日本列岛基底构造与活动断层形成位置关系的基础研究

• 批准号: 09640548
• 负责人: KOMATSU Masayuki
• 金额: $ 1.6万
• 依托单位: Ehime 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-09640548/
• 关键词: Seismic fault; Pseudo tachylire; brittle-ductile deformation; detachment; arc crust; aetive fault; 脆一塑性変形

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

特别是为了证明活动断裂与基底构造之间的关系。针对古老的韧性和脆性断层，我们对Ryoke变质带构造隆起的深层地壳剖面中的剪切面以及明显叠加在该地壳剖面逆冲断层上的活动断裂系统进行了研究和分析。研究区域为1）八幡滨大岛。 2）Ryoke变质带的和田-三洼地区，3）松山以南的川内。1）在八幡滨-大岛岛的高级变质冲断片中，假速石脉广泛发育于花岗闪长质片麻岩中，集中在三个脆性断层带中。 : 片麻岩在拟速石之前经历了两阶段的韧性剪切和一阶段的脆性剪切，而在拟速石之后又经历了阶段的韧性剪切和脆性剪切。假速石脉与 Y、R1 和 P 等尖锐滑移面相关，并与滑移面成高角度断裂。主滑移面（Y）与第一阶段预先存在的糜棱岩理面平行，切割出非常狭窄的碎裂脉。在冲断片的底部，假泰闪石脉部分发生了延性变形；矿脉内的围岩碎片变形为透镜状，石英具有优先的晶格方向，玻璃重结晶为亚显微云母和不透明矿物，其方向平行于围岩中的剪切面。 2) 尖锐的滑移面通常与 Ryoke 带底部的强糜棱岩叶理平行。日本中部和田御坂地区暴露的深部地壳部分。基底逆冲轻轻向西北倾斜，并被称为中位构造线的活动断层切割。该活动断层与上述Ryoke带逆冲断层或脆性断层无关。3)该结论也得到了对南至Kawauchi地区一条活动断层的凝胶示踪的支持。松山，是 MTL 活断层系统的一部分。人们认为活动断层已侵入 Ryoke 带的基底逆冲断层，但该地区的情况并非如此。较少的

项目成果

田中秀実ほか16名: "野島断層掘削コア(GSJ,NIED)に見られる断層岩の産状" 地質学雑誌. 104・6. XIII-XVI (1998)

Hidemi Tanaka 等 16 人：“野岛断层钻芯中看到的断层岩石的出现”（GSJ，NIED）《地质杂志》XIII-XVI（1998 年）。

田中秀実ほか15名: "野島地震断層掘削コア(GSJ,NIED)に見られる断層岩の産状" 地質学雑誌. (印刷中). (1998)

Hidemi Tanaka 和其他 15 人：“野岛地震断层钻芯（GSJ，NIED）中看到的断层岩石的出现”地质杂志（1998 年）。

Komatsu, M.: "Evolutional process of the upper crust and the developement of brittle and duetile faults in the Japanese Island!" Earth manthly. Vol.21, No.1. 19-22 (1999)

Komatsu, M.：“上地壳的演化过程以及日本岛脆性断层和应性断层的发育！”

Tanaka, H and others: "Occurrence of fault rocks in bore-hole cores from the Nozima Seismic fault (GSJ, NIED)" Jour.Geol.Soc.Japan. Vol.104 No.6. VIII-VXI (1998)

Tanaka, H 等人：“来自 Nozima 地震断层（GSJ，NIED）的钻孔岩心中断层岩石的出现”Jour.Geol.Soc.Japan。

小松正幸: "日本列島の上部地殻の発達過程と塑性-脆性断層帯形成の時間的空間的規制" 月刊地球. 21・1. 19-22 (1999)

小松雅之：“日本列岛上地壳发育过程的时空调控与塑性脆性断裂带的形成”，地球月刊21・1（1999）。