CHANGES IN FAULT MOVEMENT PROPERTY AND GENETIC MECHANISM ON THE WESTERN SEGMENT OF THE XIANGSHAN-TIANJINGSHAN FAULT ZONE

doi:10.3969/j.issn.0253-4967.2016.03.018

Abstract

Abstract:

The Xiangshan-Tianjingshan fault zone is an important part of the arc tectonic zone in northeastern Tibet, whose eastern segment is characterized by primarily left-lateral slip along with thrust component. In contrast, the fault movement property on the western segment of the Xiangshan-Tianjingshan fault zone is more complicated. According to the offset geomorphic features and cross sections revealed by the trenches and outcrops, the western segment is mainly a left-lateral strike-slip fault with normal component, and only accompanied with reverse component at specific positions. To determine the genetic mechanism of fault movement property on the western segment, we obtained three main factors based on the integrated analysis of fault geometry:(1)Step-overs:the left-stepping parallel faults in a sinistral shear zone create extensional step-overs and control the nearby and internal fault movement property; (2)terminal structures:they are conductive to stop rupture propagation and produce compressive deformation at the end of the fault trace; and(3)double bends:strike-slip faults have trace that bends such that slip between two adjacent blocks creates a compressive stress and thrust fault. Additionally, the Tianjingshan sub-block moves to SEE and creates an extensional stress at the end of the sub-block associated with normal faults. It shows that the Xiangshan-Tianjingshan fault zone has a complex evolution history, which is divided into two distinctive periods and characterized by laterally westward propagating.

Key words: the western segment of the Xiangshan-Tianjingshan fault zone, offset geomorphic feature, fault movement property, genetic mechanism

摘要：

香山-天景山断裂带作为青藏高原东北缘弧形构造带的重要组成部分，其东段整体表现为逆-左旋走滑运动性质。相反，其西段运动性质较为复杂，其上一系列的断错地貌特征以及在人工探槽和天然露头剖面上观察到的断裂运动性质，显示整个西段主要以正-左旋走滑运动为主，只在局部特定位置存在逆冲运动分量。为了确定香山-天景山断裂带西段运动性质变化的成因机制，从断裂的几何结构特征对其进行分析，得到影响与控制西段运动性质的3个主要因素：1）阶区构造，断层的左行左阶雁列式结构形成拉张型阶区，并控制着阶区附近及其内部断层的正-左旋走滑运动；2）尾端构造，在断裂端部存在阻止断层破裂传播的障碍体时，断裂一盘向前推挤的一端就会发生挤压构造变形，断层以逆-左旋走滑运动为主；3）双弯构造，次级段内部断层走向变化并呈右阶排列时，中间弯曲段在左旋走滑作用下形成局部挤压应力环境，表现为逆-左旋走滑运动。此外，天景山次级块体做SEE向运动，在其尾端形成走滑拉张构造环境，也是西段以正-左旋走滑运动为主的重要原因。香山-天景山断裂带西段的形成演化过程说明，在青藏高原东北缘弧形构造带向N扩展的过程中，整个香山-天景山断裂带可能并不是同时期形成的，而是分为运动性质显著不同的2个阶段，并表现为自东向西侧向扩展的形成演化模式。

关键词: 香山-天景山断裂带西段, 断错地貌特征, 运动性质, 成因机制

CLC Number:

P315.2

LI Xin-nan, LI Chuan-you, ZHANG Pei-zhen, WANG Xu-guang, ZHANG Long-sheng. CHANGES IN FAULT MOVEMENT PROPERTY AND GENETIC MECHANISM ON THE WESTERN SEGMENT OF THE XIANGSHAN-TIANJINGSHAN FAULT ZONE[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(3): 732-746.

李新男, 李传友, 张培震, 王旭光, 章龙胜. 香山-天景山断裂带西段的运动性质变化及其成因机制[J]. 地震地质, 2016, 38(3): 732-746.

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