Evolution of Paleozoic West Junggar Basin,NW China:Seismic data,detrital zircon evidence from Earth’s oldest alkali lake deposit  

作　　者：Dongming Zhi Deyu Gong Mingxin Liu M.Santosh Zhijun Qin Qiang Ren Xinwei Chen Hao Zou 

机构地区：[1]Xinjiang Research Base,Huairou Laboratory,Urumchi 830000,China [2]Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China [3]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China [4]School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China [5]School of Physics,Chemistry and Earth Science,University of Adelaide,Adelaide,SA 5005,Australia [6]Yonsei Frontier Laboratory,Yonsei University,Seoul 120-749,Republic of Korea [7]Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

出　　处：《Geoscience Frontiers》2024年第6期137-155,共19页地学前缘（英文版）

基　　金：supported by the funding of the National Natural Science Foundation of China(Nos.41802177,42272188);Petrochina Technology Project(Nos.2021DJ0206,2022DJ0507,2020D-5008-04).

摘　　要：The Permian Fengcheng Formation of the Western Junggar region in the Southwestern Central Asian Orogenic Belt(CAOB)represents one of Earth’s oldest alkali lake deposits.Here,we present a comprehensive study of the stratigraphy,petrography,two-dimensional seismic data,U–Pb geochronology,and Hf isotope analysis of detrital zircons of this deposit.The results,in conjunction with published data,reflect the tectonic evolution of southwestern CAOB.The ages of detrital zircons indicate that the Fengcheng Formation deposition is inferred to have concluded the early Permian Kungurian.The Hf isotopes of detrital zircons indicate that the detritus for the Fengcheng Formation was derived from upper crustal magmatic sources.The West Junggar Basin preserves the records of three Paleozoic tectonic stages.The first stage occurred in the Early Paleozoic and involved intraoceanic subduction and arc-continent collision.The second stage involved the Carboniferous closure of the Junggar Ocean following successive filling of oceanic basins.The final stage occurred in the Early Permian and was related to intracontinental rifting and tectonic inversion.The results of comparing the comprehensive data of U–Pb ages and Hf isotopes of 2537 zircons from West Junggar,Tianshan and Altay show that the orogenic belts to the south of the CAOB experienced similar plate kinematics and vertical crustal growth in the Paleozoic.

关 键 词：Detrital zircon dating Alkali lake deposit Multiple tectonic events Crustal growth Central Asian Orogenic Belt 

分 类 号：P542.2[天文地球—构造地质学]