Extensional tectonics and sedimentary response of the Early—Middle Cambrian passive continental margin,Tarim Basin,Northwest China  

作　　者：Zhiqian Gao Tailiang Fan 

机构地区：[1]Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education of China,China University of Geosciences, Beijing 100083, China

出　　处：《Geoscience Frontiers》2012年第5期661-668,共8页地学前缘（英文版）

基　　金：sponsored jointly by the National Natural Science Foundation of China(Grant No.41102087);the National Key Basic Research Program of China(No.2005CB422103);National"973"program(Grant No.2012CB214802);Major National Sci-Tech Projects(Grant Nos.2011ZX05005-002-010HZ. 2011ZX05009-002)

摘　　要：The fact that several half-grabens and normal faults developed in the Lower--Middle Cambrian of Tazhong （central Tarim Basin） and Bachu areas in Tarim Basin, northwest China, indicates that Tarim Basin was under extensional tectonic setting at this time. The half-grabens occur within a linear zone and the normal faults are arranged in en echelon patterns with gradually increasing displacement eastward. Extensional tectonics resulted in the formation of a passive continental margin in the southwest and a cratonic margin depression in the east, and most importantly, influenced the development of a three- pronged rift in the northeast margin of the Tarim Basin. The fault system controlled the development of platform -- slope -- bathyal facies sedimentation of mainly limestone-dolomite-gypsum rock-saline rock-red beds in the half-grabens. The NW-SE trending half-grabens reflect the distribution of buried basement faults.The fact that several half-grabens and normal faults developed in the Lower--Middle Cambrian of Tazhong （central Tarim Basin） and Bachu areas in Tarim Basin, northwest China, indicates that Tarim Basin was under extensional tectonic setting at this time. The half-grabens occur within a linear zone and the normal faults are arranged in en echelon patterns with gradually increasing displacement eastward. Extensional tectonics resulted in the formation of a passive continental margin in the southwest and a cratonic margin depression in the east, and most importantly, influenced the development of a three- pronged rift in the northeast margin of the Tarim Basin. The fault system controlled the development of platform -- slope -- bathyal facies sedimentation of mainly limestone-dolomite-gypsum rock-saline rock-red beds in the half-grabens. The NW-SE trending half-grabens reflect the distribution of buried basement faults.

关 键 词：Passive continentalmargin Extensional tectonicsHalf-grabens Normal faulting Tarim Basin Northwest China 

分 类 号：P315.6[天文地球—地震学] P542.3[天文地球—固体地球物理学]