塔里木盆地西北部萨拉姆断裂和阿恰断裂的构造特征与形成演化OA北大核心CSTPCD

Salam and Aqia faults are located in the northwestern Tarim Basin.The former is a newly discovered boundary fault,which forms the boundary between Keping and Wensu uplifts.The latter is the boundary fault between Bachu Uplift and Awati Sag.Both of them are high⁃angle basement⁃involved thrust faults,which strike NNW⁃SSE,dip SWW and thrust NEE.The distribution of the Salam fault shows a smooth arc protruding towards NEE,and a small scale back thrust fault developed in the upper wall.The incipient fault was formed in the Late Devonian to Early Carboniferous period.It was revived in the Late Permian to Early Triassic and Miocene,forming two thrust⁃accelerating periods.The fault has undergone some deformation transformation in Quaternary.The fault line of the Aqia fault is nearly straight,on its west side,and a back⁃thrust fault,Qiaolaimaiti fault,is developed.The two form the Aqia fault zone,in the northern section of the fault zone,and they form a"Y"type profile combination,and in the southern section,they form a basement involved thrust wedge.The Aqia fault zone formed in the Miocene and continued to evolve into the Quaternary.The Late Cenozoic faulting of the Aqia fault zone and the Salam fault is controlled by the far⁃field effect of the India⁃Asia collision.The Late Permian to Early Triassic and Late Devonian to Early Carboniferous faulting activities are two new tectonic events found in the study area.The cause of the former is related to the collision orogeny of the South Tianshan Mountains,while the cause of the latter remains to be further studied.