SEISMOLOGY AND GEOLOGY ›› 2003, Vol. 25 ›› Issue (3): 375-384.

• Brief Report • Previous Articles     Next Articles

STRUCTURAL GEOMETRY AND ACTIVITIES OF THE FUKANG-JIMSAR FAULT ZONE, XINJIANG

YOU Hui-chuan1, REN Li-sheng2, ZHANG Yu-mei3   

  1. 1. Institute of Geophysics, China Seismological Bureau, Beijing 100081, China;
    2. China Seismological Bureau, Beijing 100036, China;
    3. Institute of Geology, China Seismological Bureau, Beijing 100029, China
  • Received:2002-02-26 Revised:2002-09-10 Online:2003-09-03 Published:2009-10-26

新疆阜康-吉木萨尔断裂带的几何特征与活动性研究

尤惠川1, 任利生2, 张玉梅3   

  1. 1. 中国地震局地球物理研究所, 北京, 100081;
    2. 中国地震局, 北京, 100036;
    3. 中国地震局地质研究所, 北京, 100029
  • 作者简介:尤惠川,男,1959年生,1982年毕业于北京大学地貌与第四纪地质学专业,1984年毕业于国家地震局地质研究所地震地质学专业,获理学硕士学位,副研究员,1984年起从事活动构造与地震构造研究及地震安全性评价工作,现主要从事活动断层探测与深浅构造关系研究,电话:010-68729314.
  • 基金资助:
    地震科学联合基金(198062)和科技部项日(951102)共同资助.

Abstract: Based on detailed field investigations, this paper describes geometrical characteristics and tectonic activities of the Fukang-Jimsar Fault zone in eastern Tianshan, Xinjiang, China. This fault zone strikes nearly in east-west, dipping to south, and extends over a length of 140km. It is a major geological/geomorphological margin controlling the neotectonic movement in this region. On the southern side of the Fukang-Jimsar Fault develop Mesozoic strata, forming low mountains and hills; the northern side of the fault corresponds to a large Quaternary depression plain. The Fukang-Jimsar Fault consists of 7 segments of secondary gently dipping reverse faults with lengths of 12~24km, i.e. the Ganquanpu, Sangonghe, Sigonghe, Ganhezi, Quanquanzi, Dalongkou and Dongfeng Muchang Faults. In seismic profiles these faults make up an anticline thrust structure in the range of 5~6km depth, having dip angles of 20°~30° at the lower part and 40°~50° at the upper part(sometimes nearly 60°~80° at the ground). All these fault segments display the evidence of late Quaternary activities such as fault scarps, offset terraces and young sedimentary deposits etc. The steep dipping distal segments of the fault experienced 7 times of activities in Holocene (with an occurrence interval of 1,500yr), and have relatively small vertical slip-rate (0.10~0.40mm/yr); while the gently dipping middle segments are characterized mainly by strong thrusting, and have relatively high vertical slip-rate in Holocene (0.40~1.43mm/yr).

Key words: fault zone, structural geometry, tectonic activities, Xinjiang, Fukang-Jimsar Fault

摘要: 根据详实的野外资料对新疆阜康-吉木萨尔断裂带的构造几何特征和活动性进行了分析与研究,结果表明:断裂带由东、西两大段组成,西段由4条次级S倾逆断裂左行斜列组成,东段由3条次级S倾逆断裂右行斜列组成,总体上呈向北微凸的近EW向展布,长达140km,控制着东天山北缘的第四纪构造演化和地貌发育;组成断裂往往是低角度的逆断层,与褶皱共生,切割深度5~6km,第四纪晚期多期(次)活动,以间歇性稳定滑动为特征;断裂带端部段落倾角较大,活动量较小,全新世平均垂直滑动速率为0.10~0.40mm/a,中部段落以低倾角的推覆为特征,活动强烈,全新世平均垂直滑动速率达0.80~1.00mm/a以上。

关键词: 断裂带, 几何特征, 活动性, 新疆, 阜康-吉木萨尔

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