地质学报2016，Vol.90Issue(4)：639-652,14.
准噶尔南缘逆冲带多个逆冲断层同期活动的几何学证据
Geometric Evidence for Several Synchronous Thrust Faulting Activities of the Thrust Belt in the Southern Margin of Junngar,North Tianshan
摘要
Abstract
The Tian Shan is characteristic of typical intra-continent activities and hosts one thrusting zone in the southern margin of Junggar basin.The thrusting zone presents mainly as several rows of anticline and thrust fault which are parallel to trending of the maintains.Field investigation and mapping show that one thrust fault was developed within the core of the Manasi and Tugu anticlines and one thrust fault in the north wing of the anticline,both of which resulted in the formation of stream terrace deformation and fault escarpment.Drilling data,along with seismic data,show the existence of several north-trending thrusting faults in the Manasi anticline,and the north wing and core of the Tugu anticline,and of hidden Dongwan anticline beneath these faults and syncline between the Qingshuihe and Qigu anticlines.Interpretation of ETM remote data and 2D seismic data indicates that the Dongwan anticline was an active superimposed dural thrust structure,which resulted in a series of out-of-sequence thrusting imbricated faults developed shallowly in the Qinshuihe and the Qigu anticlines.The seismic interpretation for growth and stratum unconformity also suggests that the buried Dongwan anticline is a synchronous duplex and ‘out-of-sequence’ thrust fans was mainly formed from late Miocene to present. We follow the Boyer ’s synchronous thrust model to interpret the structural styles of the South Junggar thrust and fold belt which differs from a relatively simple hinterland-to-foreland (piggy-back)progression of thrusting,in which older thrusts were assumed to become deactivated as new thrusts propagated toward the foreland.The mode of synchronous thrusting indicates that during the development of dual thrust structure triggered by deep sequential thrusting,the synchronous thrusting in the subsurface can produce out-of-sequence thrusting at the surface,similar to imbricated thrust fault.关键词
准南逆冲带/无序逆冲/双重构造/同期逆冲/多期活动Key words
South Junggar thrust and fold belt/out-of-sequence thrust/duplex/synchronous thrusting/multiple-deformation引用本文复制引用
杨庚,赵孟军,陈竹新,王晓波..准噶尔南缘逆冲带多个逆冲断层同期活动的几何学证据[J].地质学报,2016,90(4):639-652,14.基金项目
本文为国家重大专项课题（2011ZX05003-002）及中石油股份公司科技专项（2016B-0401）资助的成果。 （）
