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| 柯坪塔格推覆构造几何学、运动学及其构造演化 | |
| 引用本文： | 曲国胜,李亦纲,陈杰,宁宝坤,李岩峰,李军,尹军平.柯坪塔格推覆构造几何学、运动学及其构造演化[J].地学前缘,2003,10(Z1):142-152. |
| 作者姓名： | 曲国胜 李亦纲 陈杰 宁宝坤 李岩峰 李军 尹军平 |
| 作者单位： | 1. 中国地震局,地质研究所,北京,100029 2. 新疆地震局,新疆,乌鲁木齐,830011 3. 塔西南油田公司,新疆,泽普,844804 |
| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，中国科学院资源与生态环境研究项目，G1999043305，49872075，49834005，，， |
| 摘 要： | 大量野外构造地质调查和深部构造解释表明柯坪塔格推覆构造由多组倒转复式背斜、复式箱状背斜构成的推覆体及其前缘逆冲断裂组成 ,由寒武系—第四系组成的推覆体由北向南逆—斜冲 ,平面上构成向南凸出的弧形推覆构造 ;普昌断裂由各不相连的逆冲斜冲断裂段组成 ,而不是完整的一条走滑断层 ,各推覆体前缘逆冲断裂与各推覆体的普昌断裂段共同构成统一的前缘逆冲斜冲逆冲断裂和推覆构造系统 ;普昌断裂段以西的推覆体具有向东抬升、向西倾覆的鼻状构造特征 ,普昌断裂段以东的推覆体具有向西抬升、向东倾覆的鼻状构造特征 ,普昌基底隆起带是巴楚隆起隐伏在柯坪塔格推覆构造之下的部分。各推覆体前缘断裂在深部均归并于统一的寒武系底部的滑脱面 ,其南浅北深 ,东浅西深 (普昌隆起带以西 )或西浅东深 (普昌隆起带以东 ) (6 10km ) ,埋深较大区发育多组滑脱面。柯坪塔格推覆构造的形成时期为晚第四纪 ,为现今活动的推覆构造系统。文中认为各推覆体向南西的倾覆端基底滑脱面和中新生界内部的滑脱面没有贯通 ,是未来 6级以上地震的发震构造部位。 |
| 关 键 词： | 柯坪塔格 逆-斜冲推覆构造 现今活动 |
| 文章编号： | 1005-2321(2003)S0-0142-11 |
| 修稿时间： | 2003年4月11日 |
GEOMETRY,KINEMATICS AND TECTONIC EVOLUTION OF KEPINGTAGE THRUST SYSTEM |
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| QU Guo-sheng ,LI Yi-gang ,CHEN Jie ,NING Bao-kun ,LI Yan-feng ,LI Jun ,YIN Jun-ping.GEOMETRY,KINEMATICS AND TECTONIC EVOLUTION OF KEPINGTAGE THRUST SYSTEM[J].Earth Science Frontiers,2003,10(Z1):142-152. | |
| Authors: | QU Guo-sheng LI Yi-gang CHEN Jie NING Bao-kun LI Yan-feng LI Jun YIN Jun-ping |
| Institution: | QU Guo-sheng 1,LI Yi-gang 1,CHEN Jie 1,NING Bao-kun 1,LI Yan-feng 1,LI Jun 2,YIN Jun-ping 3 |
| Abstract: | In this paper we have discussed the stratigraphy, geometry, kinematics and tectonic evolution of Kepingtage thrust system based on a lot of outcrop geological surveys and comprehensive interpretation with seismic profiles, MT profiles and gravity data. Kepingtage thrust system consists of many arcuate thrust nappes thrusting-oblique thrusting from north to south with inversed multi-anticlines and their front thrust faults, which were formed by Cambrian—Quaternary sedimentary rocks. It is discovered that the Puchang fault was formed by unconnected thrusting-oblique thrusting segments divided by nappes rather than an integrate strike-slip fault. The front thrust faults of each nappe combined with the related segments of Puchang fault form the thrusting-oblique thrusting front faults of the nappes and the whole thrust system. The nappes to the west of Puchang basement uplift show the nose structures dipping to the west, and the nappes to the east of Puchang basement uplift show the nose structures dipping to the east. Puchang basement uplift is a part of Bachu uplift extending below the Kepingtage thrust system. The front faults of the nappes form an integrate detachment surface in the deep along the bottom of Cambrian with the shallower depth in the southeast and deeper depth in the northwest (for the region to the west of Puchang basement uplift) and with the shallower depth in the west and deeper depth in the east (for the region to the east of Puchang basement uplift)(6~10 km). Kepingtage thrust system was formed in Late Quaternary and is still active at present. We consider that the basement detachment and the inner Mesozoic—Cenozoic detachment faults could not have formed some integrate fault surfaces in the dipping end of nappes, so the earthquakes with the magnitude larger than 6 will occur in the near future in these area. |
| Keywords: | Kepingtage thrusting-oblique thrusting system active at present |
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