Meso-Cenozoic extensional structures in the Northern Tarim Basin,NW China
作者单位：Institute of Geology and GeophysicsChinese Academy of Sciences PetroChina Company Limited Tarim Oil-field CompanyPetroChina Hefei University of Technology
会议名称：《中国科学院地质与地球物理研究所2013年度（第13届）学术年会》
会议日期：2014年
学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学]
基 金：supported by the funds from the Key National Science & Technology Specific Projects (2011ZX05028-003) National Natural Science Foundation of China (40972085) Major State Basic Research Development Program of China(2006CB202301) Science and Technology Programs of Tarim Oilfield Company,PetroChina
关 键 词：Northern Tarim Basin Seismic profile Meso-Cenozoic extensional structure Transtensional fault zone Post-orogenic stress relaxation Tectonic escape
摘 要：Meso-Cenozoic extensional structures are important for understanding the tectonics of the Chinese Central *** paper presents a systematic investigation on the Meso-Cenozoic extensional structures in the Northern Tarim *** interpretations of seismic data reveal that the Meso-Cenozoic extensional structures were widely developed in the Northern Tarim *** extensional structures are regionally composed of many small normal faults,which usually group into left-or right-step en echelon and form several transtensional fault *** of normal faults in profile become small graben-horst or staircase-like *** on the areal distribution, structural style,combination relationship,formation and evolution time,and formation mechanism of the extensional structures,we found that the Meso-Cenozoic extensional structures in Northern Tarim Basin can be classified into two conjugate normal fault systems,which were formed separately in Jurassic-Early Cretaceous and Late Cretaceous-Neogene. The former is likely associated with the stress relaxation after a collisional orogeny accompanied with a certain degree of anticlockwise rotation of the Tarim block relative to the South Tianshan;the latter is possibly induced by the east by south tectonic escape of the Tarim block with a certain degree of clockwise rotation relative to the South Tianshan triggered by the far-field effect of the Himalayan orogeny.