SEISMOLOGY AND GEOLOGY ›› 2006, Vol. 28 ›› Issue (2): 224-233.

• Brief Report • Previous Articles     Next Articles

CENOZOIC DEFORMATION AND PROPAGATION OF THE KALPINTAG FOLD NAPPE

SONG Fang-min, MIN Wei, HAN Zhu-jun, XU Xi-wei   

  1. Institute of Geology, China Earthquake Administration, Beijing 100029, China
  • Received:2005-07-17 Revised:2005-10-24 Online:2006-06-08 Published:2009-08-27

柯坪塔格推覆体的新生代变形与扩展

宋方敏, 闵伟, 韩竹军, 徐锡伟   

  1. 中国地震局地质研究所, 100029, 北京
  • 作者简介:宋方敏,男,1948年出生,1975年毕业于南京大学地质系,研究员,主要从事活动构造研究,电话:010-62009029,E-mail:sfmin48@tomcom.
  • 基金资助:
    中国地震局“新疆巴楚-伽师6.8级地震应急工作专项计划”项目资助

Abstract: The Kalpintag fold nappe is located at the northwestern foot of the Tianshan Mountains. Since Cenozoic, owing to the Indian-Eurasian collision, the Mesozoic fold structures of Tianshan have been rejuvenated, uplifted and pushed northward and westward. As a result, several rows of fold-reverse fault zones have been progressively formed within the foreland basins. This paper describes in detail the Cenozoic deformation features and propagation of the fold-reverse fault zone on the west of the nearly south-north-trending Piqiang fault zone. The results show that the Cenozoic deformation of the nappe was characterized by wavy differential uplift, and this has caused the successive formation of the fold-reverse fault zone from the southern side of the Tianshan Mountains to the Tarim Basin. Among them, the early-formed folds are close to the Tianshan Mountains, while the latter-formed folds are close to the Tarim Basin, indicating the general tendency of northward propagation of the fold-reverse fault zone during their formation process. The distance of propagation may reach up to 76km. Moreover, the front of individual fold-reverse fault zone consists of several fault strands, which are associated with folds and have different ages of formation and time of recent activity. The early-formed faults are close to the Mountain side and the latter-formed close to the basin, indicating the northward propagation of the frontal faults of the individual fold. The distance of propagation is about 100~500m. The mechanism of the propagation of the fold-reverse fault zone is discussed in this paper as well.

Key words: Kalpintag, Nappe, fold-reverse fault zone, deformation and propagation

摘要: 柯坪塔格推覆体位于天山西南麓。新生代以来,由于印度板块与欧亚板块的碰撞,天山晚古生代褶皱和断裂构造重新复活隆起,并向南北两侧推挤,在前陆盆地中渐进式地形成多排褶皱-逆断裂带。文中讨论了皮羌近SN向断裂带以西推覆体的新生代变形与扩展特征。结果表明,推覆体的新生代变形为波浪式差异性隆起。从天山南侧到塔里木盆地方向,构成推覆体的各排褶皱-逆断裂带的形成顺序有先后之分,早期形成的靠近天山,晚期形成的靠近塔里木盆地,反映推覆体在形成过程中由北向南的扩展,其扩展距离最大约76km。除此之外,各排褶皱-逆断裂带前缘都由多条断裂组成,它们与褶皱伴生,具有不同的形成和新活动时代。早期形成的断裂靠近山地一侧,晚期形成的断裂靠近盆地一侧,反映褶皱-逆断裂带单排前缘断裂也具有由北向南扩展的性质,其扩展距离为100~500m。最后,对推覆体扩展的形成机制进行了讨论。

关键词: 柯坪塔格, 推覆体, 褶皱-逆断裂带, 变形与扩展

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