Development of deep-seated gravitational slope deformation on a shale dip-slope: Observations from high-quality drill cores

被引：38

作者：

Chigira, M. ^{[1
]}

Hariyama, T. ^{[1
]}

Yamasaki, S. ^{[2
]}

机构：

[1] Kyoto Univ, Disaster Prevent Res Inst, Uji, Kyoto 6110011, Japan

[2] Kitami Inst Technol, Kitami, Hokkaido 0908507, Japan

来源：

TECTONOPHYSICS | 2013年 / 605卷

关键词：

Deep-seated gravitational slope deformation; Landslide; Nontectonic fault; Shale; Dip slope; ROCKS; VAJONT; LANDSLIDES; MOUNTAINS;

D O I：

10.1016/j.tecto.2013.04.019

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We analyzed high-quality drill cores with 100% recovery drilled into a gravitationally deformed dip-slope of a shale-dominated sequence of sediments in Japan. The slope had undulating surfaces but no well-defined landslide scarps, suggesting that parts of the slope had undergone gravitational deformation but had not completely separated from the surrounding bedrock. The gravitational deformation of shale and sandstone is characterized by disintegration and brecciation of sediments and the formation of pulverized zones with poorly developed planar structures, jigsaw-like structures, and fracture openings. Shear zones are distributed intermittently within the slope but have not merged discernably into a through-going master sliding surface. Incipient landslide shear zones form openings within coherent rock by shearing along bedding, with these shear zones potentially developing downward in a stepwise manner, which may be related to stress redistribution induced by river incision. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：104 / 113

页数：10

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