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Study on structure of fracture zone and landslide structure of fracture zone landslide in the Sambagawa metamorphic belt, Shikoku

四国三波川变质带断裂带结构及断裂带滑坡结构研究

基本信息

批准号：
15540438
负责人：
YOKOYAMA Shunji
金额：
$ 1.34万
依托单位：
Kochi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540438/
关键词：
Hiroshi Koide Landslide in Japan fracture zone landslide fracture zone Sambagawa metamorphic belt collapse of slide type gravitational creep tilting Azue fracture zone landslide 岩盤クリープ蛇紋岩緑色岩黒瀬川帯結晶片岩小出博谷側への曲げ褶曲

项目摘要

Fracture zone landslide defined by Koide(1955) is a collapse of slide type which has features that the landslide moving body breaks into debris, the mass of debris falls down on mountain slope, and it often dames up stream of river. Fracture zone defined by Koide(1955) is a zone of crushed rocks characterized by fractures with a polished and slicked surface. However Koide asserted fault gouge consisting of fault clay and fault breccia to posses no requirement necessary for fracture zone. Many of the fracture zones named after Koide run through in accretionary complex. Fractured rocks satisfying the criterion of recognition for fracture zone are fractured serpentinite, fractured greenstone and pelitic merlage fractured along a polished scaly cleavage.Among many geologists and geo-technicians it has been seemed that landslides in the Sambagawa metamorphic belt are typical of the fracture zone landslide, but they are not a collapse of slide type but a slow moving and repeating landslide. Fractured rocks occurred in the Yoshino river-Kino river fracture zone and the Mikabu fracture zone are not tectonic origin but non-tectonic origin due to gravitational creep tilting.This paper made clear that large-scaled collapse caused by heavy rainfall of the No. 10 typhoon in 2004 at Azue, Naka-cho, Tokushima Prefecture is atypical fracture zone landslide occurred in fractured greenstone.

小出（1955）定义的断裂带滑坡是一种滑动型滑坡，其特征是滑坡运动体破碎成岩屑，岩屑块福尔斯沿山坡下落，并常在河流上游筑坝。小出（1955）定义的断裂带是一个破碎岩石带，其特征是表面光滑的裂缝。然而，Koide认为断层泥由断层粘土和断层角砾岩组成，不需要破碎带。许多以小出命名的断裂带贯穿于增生杂岩中。符合断裂带识别标准的断裂岩石是断裂蛇纹岩、断裂绿岩和泥质混杂岩，它们沿光滑的鳞片状劈理沿着断裂。许多地质学家和地质技术人员认为，桑巴川变质带的滑坡是典型的断裂带滑坡，但它不是滑动型的崩塌，而是一种缓慢移动和重复的滑坡。吉野川-木野川断裂带和三釜断裂带中的断裂岩不是构造成因的，而是重力蠕滑倾斜的非构造成因。2004年第10号台风强降雨在德岛县中町安江引起的大规模崩塌是发生在断裂绿岩中的非典型断裂带滑坡。