北京大学学报（自然科学版） ›› 2016, Vol. 52 ›› Issue (5): 891-901.DOI: 10.13209/j.0479-8023.2016.054

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祁连山北缘老君庙冲断带构造几何学特征及演化

肖毓祥1,2, 杜文博1, 张波3,†, 张进江3, 侯秀林2, 王巍1, 何欣2, 李晓军1, 阴从元3   

  1. 1. 中国石油天然气集团公司玉门油田分公司, 酒泉735019
    2. 中国石油勘探开发研究院, 北京100083
    3. 北京大学地球与空间科学学院, 北京100871
  • 收稿日期:2015-09-19 修回日期:2015-12-02 出版日期:2016-09-20 发布日期:2016-09-20
  • 通讯作者: 张波, E-mail: geozhangbo(at)pku.edu.cn
  • 基金资助:
    中国石油股份有限公司重大科技专项(2013E-3304)资助

Geometry and Tectonic Evolution of the Laojunmiao Break-Thrust Belt in the Northern Margin of Qilian Mountain

XIAO Yuxiang1,2, DU Wenbo1, ZHANG Bo3,†, ZHANG Jinjiang3, HOU Xiulin2, WANG Wei1, HE Xin2, LI Xiaojun1, YIN Congyuan3   

  1. 1. Exploration and Production Research Institute, Yumen Oilfield of CNPC, Jiuquan 735019
    2. Exploration and Production Research Institute, CNPC, Beijing 100083
    3. The Key Laboratory of Orogenic Belts and Crustal Evolution (MOE), School of Earth and Space Sciences, Peking University, Beijing 100871
  • Received:2015-09-19 Revised:2015-12-02 Online:2016-09-20 Published:2016-09-20
  • Contact: ZHANG Bo, E-mail: geozhangbo(at)pku.edu.cn

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摘要：

基于老君庙构造带三维地震资料, 结合以往研究成果, 分析祁连山北缘西段老君庙带的构造几何特征及构造演化。得到以下认识: 老君庙冲断带具有双层结构, 包括浅部的三角剪切型褶皱-冲断构造以及冲断带层下盘隐伏的逆冲构造楔体; 该冲断带自东向西与北东?南西走向的 134 断裂链接, 形成统一的“134-老君庙弯曲断裂”体系, 其后缘为134 走滑兼逆冲性质的调节断裂, 前锋为庙北三角剪切型褶皱-冲断系; “134-老君庙-青头山”断裂围限的上盘逆冲岩片向前陆方向扩张, 导致平行冲断带近东西向的挤压调节变形, 引起浅部新生代地层发生近南北走向的褶皱变形。

关键词: 祁连山北缘冲断带, 老君庙背斜, 三角剪切型褶皱, 冲断, 构造楔体, 断裂链接

Abstract:

On the base of the 3D seismic profile interpretations, combined with the previous findings, geometry and tectonic evolution across and along the Laojunmiao break-thrust belt in the northern margin of the Northern Qilian belt are deciphered. The Laojunmiao belt is a bi-layer thrust system, consisting of a trishear faultpropagation fold system in the upper part, wedge-shaped thrust in the lower part. The Laojunmiao thrust system is linked with the NE-SW striking-slip 134 fault in the western segment, which forms a unified system of fracture on the Laojunmiao belt. Thrusting sheet above the hanging wall of the 134-Laojunmiao fault system is folded under nearly E-S compressive stress field, which results in the N-S striking folding to superpose on the Cenozoic bedding.

Key words: Northern Qilian thrust belt, Laojunmiao anticline, tri-shearing fold, thrust, wedge-shaped thrust, fault linkage

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