1 南京师范大学地理科学学院,江苏南京 210046 2 南京大学地球科学与工程学院,江苏南京 210093 3 中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京 100083 4 西安地质矿产研究所,陕西西安 710054 5 中国石化勘探南方分公司,四川成都 610041 6 Department of Earth and Planetary Sciences,Macquarie University,NSW 2109, Australia 7 中国石油华北油田分公司第三采油厂,河北河间 062450
Late-orogenic arcuate fold-thrust belts in northern Yangtze area:Structural characteristics and basin evolution
Wang Ping1,2, Liu Shaofeng3, Zheng Hongbo1, Wang Kai4, Gao Tangjun5, Pan Feng4, Li Wangpeng3, Jiang Chengxin3,6, Chen Yuliang2, Yang Xuesong7
1 School of Geography,Nanjing Normal University,Nanjing 210046,Jiangsu 2 School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,Jiangsu 3 State Key Lab of Geological Processes and Mineral Resources,China University of Geosciences(Beijing),Beijing 100083 4 Xi′an Institute of Geology and Mineral Resources,Xi′an 710054,Shaanxi 5 Sinopec Exploration Southern Company,Chengdu 610041,Sichuan 6 Department of Earth and Planetary Sciences,Macquarie University,NSW 2109, Australia 7 The Third Exploit Factory of Huabei Oilfield Company,PetroChina, Hejian 062450,Hebei
Abstract：During the Late Jurassic to Late Cretaceous,the northern Yangtze area has evolved into a late-orogenic tectonic regime,which is characterized by the development of several thin-skinned foreland fold-thrust belts,including Dabashan,Dahongshan and eastern Sichuan-western Hunan and Hubei fold-thrust belts.They all show arc-shape geometries and generally trend parallel to the Qinling-Dabieshan Orogen and Xuefengshan Orogen.Synthesis of structural mapping,sedimentary facies and provenance analyses revealed that these arcuate fold-thrust belts not only deformed the original foreland sequence,but also controlled the basin evolution during the Late Jurassic through Late Cretaceous.Here we define the late-orogenic tectonic-paleogeography evolution into three phases as (1)From Late Jurassic to early Early Cretaceous: The Dahongshan and Dabashan fold-thrust belts initially propagated southwestwards and controlled the deposition of Penglaizhen Formation in northern Sichuan Basin and Zigui Basin.The original foreland basin was bounded by eastern Sichuan-western Hunan and Hubei fold-thrust belt to the southeast and Longmenshan fold-thrust belt to the west,leading to an intracratonic basin with foredeep subsidence which is also referred as “walled sedimentary basin”.(2)From middle Early Cretaceous to late Early Cretaceous: The propagation of the Dahongshan and Dabashan fold-thrust belts attenuated,while the eastern Sichuan-western Hunan and Hube fold-thrust belt continued the northwestward propagation and formed the structural lines trending northeast.On the front of the eastern Sichuan-western Hunan and Hubei fold-thrust belt,the depocenter of the basin was located near Yichang city where the Huangling anticline has yet been exposed.(3)During the Late Cretaceous: The eastern Sichuan-western Hunan and Hubei fold-thrust belt propagated northwestly with slight change of the structural trends from northeast to north-northeast.The Huangling anticline was initially formed during this period.The depocenter of the basin located on the two ends of the eastern Sichuan-western Hunan and Hubei fold-thrust belts with Yichang on the north end and Xishui on the south end.Meanwhile,there are also many wedge-top sediments developed inside the fold-thrust belt,leading to the formation of several piggy-back basins such as Enshi basin,Qianjiang basin and Laifeng basin.
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