THE STUDY OF THE LEFT-LATERAL DISPLACEMENT ON THE XIANGSHAN-TIANJINGSHAN FAULT IN LATE QUATERNARY

doi:10.3969/j.issn.0253-4967.2013.03.002

Abstract

Abstract:

Xiangshan-Tianjingshan Fault is one of the major active faults of the arc fault zone on the northeastern margin of the Qinghai-Tibet Plateau. The Yellow River in the Shapotou area flows through the fault and forms a perfect "Ω-shape" bend. Shapotou not only is a tourist mecca,but also a hotspot for studying the geomorphology,neotectonics,the uplift of Qinghai-Tibet Plateau and other issues. Xiangshan-Tianjingshan Fault is mainly a left-lateral strike-slip fault with a minor thrust component. So to study the fault's offsets is of vital importance. This paper,based on the characteristic of the distribution of the Yellow River terraces in the Shapotou Big Bend area,analyzes the offsets of the Xiangshan-Tianjingshan Fault since the formation of the terraces. The results reveal that 3 river terraces are developed on the right of the Yellow River in the Shapotou area,while there is no terrace developed on the left of the river. The maximum left-lateral displacement of Xiangshan-Tianjingshan Fault is less than 880m,and the slip rate is less than 5.18mm/a since 170ka BP.

Key words: Xiangshan-Tianjingshan Fault, left-lateral strike-slip, terrace, Shapotou

摘要：

香山-天景山断裂是青藏高原东北缘弧形断裂带中一条重要的活动断裂,长期以来活动强烈,早期以挤压逆冲为主,可能在第四纪早期转变成以左旋走滑为主兼具逆冲性质的断裂。黄河在夜明山前缘穿过此断裂,在沙坡头大弯一带形成一个完美的 "几"形拐弯。文中对沙坡头大弯一带黄河地貌、阶地特征、样品年龄进行了探查和分析测试,结果表明,距今170ka以来,香山-天景山断裂左旋位移量最大不超过880m,滑移速率<5.18mm/a。

关键词: 香山-天景山断裂, 左旋走滑, 阶地, 沙坡头

CLC Number:

P315.2

YIN Gong-ming, JIANG Ya-feng, YU Gang, HAN Fei, LIU Chun-ru. THE STUDY OF THE LEFT-LATERAL DISPLACEMENT ON THE XIANGSHAN-TIANJINGSHAN FAULT IN LATE QUATERNARY[J]. SEISMOLOGY AND GEOLOGY, 2013, 35(3): 472-479.

尹功明, 江亚风, 俞岗, 韩非, 刘春茹. 晚第四纪以来香山-天景山断裂左旋走滑量研究[J]. 地震地质, 2013, 35(3): 472-479.

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