Structural,Kinematic and Geochronological Study of the Main Tianshan Shear Zone in the Borohoro Ranges,NW China

查看全文 作　　者：LIU [1]Tianlun;CHEN [1]Siyu;ZHANG [1]Bo;CAI [2]Keda;HAN [1]Baofu;QU [3]Junfeng;GUO [1]Lei;WANG [4]Meng

机构地区：[1]The Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing 100871,China;[2]School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;[3]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;[4]Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits,MNR,School of Earth Science and Resources,Chang'an University,Xi'an 710054,China

出　　处：《Acta Geologica Sinica(English Edition)》索引2021年第95卷第5期,共25页

基　　金：financially supported by the Major Basic Research Project of the Ministry of Science and Technology of China(Grant No.2014CB448000);the National Natural Science Foundation of China(Grant Nos.41772207,41422206)。 摘　　要：The western segment of the Main Tianshan shear zone(MTSZ)branches into three major dextral strike-slip shear zones in the Borohoro Ranges,northwestern China.Mylonitic rocks within these zones exhibit vertical foliations,subhorizontal lineations,and dextral kinematics.The microstructures and CPO patterns of calcite and quartz in the tectonites suggest shearing at temperatures of 200℃ to 500℃ or above.The amount of dextral displacement along the zones is less than 100 km.LA-ICP-MS U-Pb dating of zircons from some pre-kinematic granites gave ages of 364-325 Ma and 316 Ma,and zircons from a syn-kinematic leucogranite gave an age of 291 Ma.We propose that dextral shearing along the MTSZ started in the earliest Permian.Our data indicate that collision between the Yili and Junggar plates might have finished before 325 Ma or 316 Ma,with a tectonic transformation from 325 Ma to 300 Ma,resulting in intracontinental transpression from 300 Ma or 291 Ma.We suggest that the formation of the Kazakhstan orocline(KO)took place in two stages,with the early stage of bending driven by convergence related to oblique subduction,and the late stage possibly associated with lateral disarticulation as a result of the dextral strike-slip shear zones. 关键词：structural geology geochronology dextral shearing CPO pattern Late Paleozoic Main Tianshan Shear Zone Yili-North Tianshan

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Structural,Kinematic and Geochronological Study of the Main Tianshan Shear Zone in the Borohoro Ranges,NW China

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