塔里木盆地西北缘晚新生代印干断层的运动学特征及其区域构造意义  

The Kinematic Features and Regional Geological Significances of the Late Cenozoic Ingan Fault,Northwestern Tarim Basin

作　　者：张子亚[1] 刘冬冬[1] 朱贝[1] 郭召杰[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《大地构造与成矿学》2013年第2期184-193,共10页Geotectonica et Metallogenia

基　　金：国家科技重大专项"复杂油气田地质与提高采收率技术"项目;"复杂含油气盆地构造及其控油气作用"(编号:2011ZX05009-001)专题资助

摘　　要：塔里木盆地西北缘NW走向的印干断层为逆冲断层,断层带指向构造证据表明印干断层的逆冲方向为NE向,与柯坪冲断系SE向推覆明显不同。地层学、断层切割关系等证据显示印干断层形成早于更新世活动的柯坪冲断系,活动期主要在上新世至早更新世。研究结果表明,柯坪塔格地区晚新生代发育两期方向不同的逆冲推覆构造,印干断层是上新世帕米尔构造结前陆冲断带的前缘冲断层,而柯坪冲断系是更新世以来南天山向塔里木盆地方向的前陆冲断带。The Ingan fault,located at the northwest margin of the Tarim Basin,is a northeastward thrust fault. Evidence such as the fault striation and calcite fiber bundles suggests that the thrust direction was northeastern,which is obviously different to the southeastern thrusting Kalpin faults. The stratigraphy and the relationship of fault cutting imply that the active period of the Ingan fault was Pliocene to Early Pleistocene,earlier than that of the Pleistocene Kalpin fault. Research results indicate that two stages of thrust tectonics in different directions developed in the Kepingtage area during Late Cenozoic,within which,the Ingan fault is the front thrust of the Pamir syntax foreland thrust belt in Pliocene,while the Kalpin thrust system presents the foreland thrust belt of South Tianshan since Pleistocene.

关 键 词：塔里木西北缘 晚新生代 印干断层 运动学特征 区域构造意义 

分 类 号：P542[天文地球—构造地质学]