Yingen-Ejinaqi Basin, Yin-E Basin for short, is a Meso-Cenozoic basin on the southern margin of the central Asian orogenic belt. Late Cenozoic extensional structues were revealed at several places in and around the Yin-E Basin during our 2017～2018 field geological investigations. They are mainly normal faults. Two normal faults dipping to each other form a graben. An X-type conjugate cleavage system was found in the granite located north to Dingxin Town. The normal fault located south to Hangwula and the garaben located north to Dingxin Town were formed in Late Quaternary. The normal fault found at Beishan coal-mine was possiblly also formed in Late Quaternary. These Late Quaternary and possible Late Quaternary normal faults strike in E-W direction. The conjugate cleavage system found in the granite located north to Dingxin Town is possile contemporanous structure of the Late Quaternary normal faults. It is constituted by two groups of cleavages striking NE-SW and NW-SE with very high dip angle. The normal faults on the Suhongtu anticline were formed in Late Neogene-Early Quaternary. They strike in E-W direction. Acient stress analysis, the maximum tensional stress of both the Late Quaternary and Late Neogene-Early Quaternary extentional structure is in N-S direction. The Late Cenozoic extensional structures are components of the far-field effect of the India-Asia collision. These two extensional deformation phases represent two tectonic pauses under the far-field effect of the India-Asia collision.
Li Lingxi Zhang Hongan Li Jidong Li Yuejun Chen Qingtang Shi Dahai Zhao Yan Li Cheng Zhao Tianyu Han Bo Gao Yanyan Shi Bin. Two Late Cenozoic extesional deformation phases in and around Yingen-Ejinaqi Basin： Two tectonic pauses under the far-field effect of the India-Asia collision[J]. Chinese Journal of Geology, 2019, 54(2): 386-397.