塔里木盆地西北缘柯坪逆冲构造带与巴楚隆起的叠加关系  

Superposed relationship between Kalping thrust belt and Bachu uplift,northwest Tarim

作　　者：杨庚 郭华[2] 

机构地区：[1]中国石油天然气股份公司勘探与生产分公司,北京100011 [2]核工业北京地质研究院,北京100029

出　　处：《铀矿地质》2003年第1期1-7,共7页Uranium Geology

基　　金：国家自然科学基金 (编号 :4 95 0 2 0 37)资助项目。

摘　　要：塔里木盆地西北缘柯坪逆冲带是天山和塔里木盆地在新生代盆山耦合作用下形成的构造变形区 ,为印度板块和欧亚板块碰撞所影响的最明显地区之一。柯坪逆冲带逆冲方向是从天山向塔里木盆地内逆冲 ,构造变形样式是以寒武系蒸发岩层为滑动拆离面的薄皮构造 ,也有卷入前寒武系 元古界结晶基底的逆冲推覆构造 ,以及北西向走滑断层。以皮羌断层和印干断层为界 ,根据构造样式的差异 ,柯坪逆冲带可分为 3个构造区 ,即西克尔区、柯坪区和阿克苏区。西克尔区逆冲推覆构造卷入地层厚度大 ,基底拆离面深度为 7～ 8km ;柯坪区逆冲推覆构造卷入地层厚度小 ,基底拆离面深度为5～ 6km ;阿克苏区则为卷入前寒武系结晶基底的逆冲推覆构造。这些构造样式的差异是由于北西向的巴楚隆起对近北东走向的柯坪逆冲构造带叠加的结果 ,尤其巴楚隆起的南界———皮羌高角度逆冲断层与柯坪逆冲带发育的皮羌左旋走滑断层 ,以及巴楚隆起的北界———印干逆冲断层与柯坪逆冲带发育的印干右旋走滑断层对柯坪逆冲构造带的叠加最为明显。The Kalping thrust belt,northwest Tarim,is an actively deformed district affected by the Indian-Eurasia collision originated from the coupling between the Tianshan and Tarim basins in Cenozoic Era.Overall verges in the Kalping thrust belt are toward the interior of the Tarim basin,from the Tianshan to the south.Styles of structural deformation are composed of large thin-skinned structures with its decollement horizon of Cambrian evaporates,and thrust faults involved in the Precambrian-Proterozoic crystalline basement,as well as NW-strike-slip faults.The thrust belt can be divided by the Piqiang strike-slip fault,the Yingan strike-slip fault into three regions,i.e.the Xiker region,the Kalping region and the Akesu region,according to the variation and differentiation of structural deformation styles of the Kalping thrust belt.In the Xiker region,much great thickness of strata were involved in the Kalpin thrust belt and the depth of basement decollement horizon is 7～8 km.Relatively little thickness of strata were involved in the Kalpin thrust belt in the Kalping region and the depth of basement decollement horizon is 5～6 km.In the Akesu region,the Precambrian basement was involved in the Kalping thrust belt.Differences of structural styles result from the superposition of NW-striking Bachu uplift with the NE-striking Kalping thrust belt,especially the superposition of the high-angle Piqiang thrust fault at the southern boundary of the Bachu uplift with the counterclockwise Piqiang strike-slip fault,and of the high-angle Yingan(Aqia or Tumuxiuke)thrust fault at the northern edge of the Bachu uplift with the clockwise Yingan strike-slip fault.

关 键 词：逆冲构造带 塔里木盆地 巴楚隆起 构造叠加 天山 新生代 盆山耦合作用 

分 类 号：P542[天文地球—构造地质学]