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苏皖地块--特提斯演化阶段独立的构造单元
引用本文:吴根耀,陈焕疆,马力,徐克定. 苏皖地块--特提斯演化阶段独立的构造单元[J]. 古地理学报, 2002, 4(2): 77-87. DOI: 10.7605/gdlxb.2002.02.010
作者姓名:吴根耀  陈焕疆  马力  徐克定
作者单位:1.中国科学院地质与地球物理研究所 北京 100029;2.同济大学海洋地质与地球物理系 上海 ;3.中石化集团公司江苏油田 江苏江都 ;4.中国石油天然气总公司浙江石油勘探处 浙江
基金项目:中石化集团公司油田部南方海相油气勘探项目经理部项目资助
摘    要:基于苏皖地区的基底性质、晚元古代-中生代特征的沉积-火成建造、区域成矿和构造专属性,结合古地磁资料,提出了苏皖地块是特提斯演化阶段独立的构造单元的观点。它以苏鲁洋与华北克拉通间隔。震旦纪-早古生代的建造及变形特征与扬子克拉通有差异。石炭纪末和早二叠世的沉积和生物群表明它当时是古特提斯洋域里的一个中间地块,此时它已独立于扬子克拉通之外。三叠纪时苏鲁洋发生过大规模的消减但未闭合,因而苏皖地块的晚三叠世植物群与扬子克拉通有较明显区别。苏皖地块与华北克拉通(指胶辽地块)碰撞可能发生在早白垩世,该地区超高压变质岩的折返与之有关。之后,苏皖地块成为亚洲大陆雏形的一部分。

关 键 词:苏皖地块 建造-变形特征 特提斯 苏鲁祥 古地磁资料 早二叠世 震旦纪
文章编号:1671-1505(2002)02-0077-11
修稿时间:2001-09-27

SU-WAN BLOCK: AN INDEPENDENT TECTONIC UNIT DURING PERIOD OF TETHYAN EVOLUTION
Wu Genyao Chen Huanjiang Ma Li Xu Keding Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing Dept of Marine Geology , Geophysics,Tongji University,Shanghai Jia. SU-WAN BLOCK: AN INDEPENDENT TECTONIC UNIT DURING PERIOD OF TETHYAN EVOLUTION[J]. Journal of Palaeogeography, 2002, 4(2): 77-87. DOI: 10.7605/gdlxb.2002.02.010
Authors:Wu Genyao Chen Huanjiang Ma Li Xu Keding Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing Dept of Marine Geology & Geophysics  Tongji University  Shanghai Jia
Affiliation:1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;2.Dept. of Marine Geology & Geophysics,Tongji University, Shanhai ;3.Jiangsu Oilfield, SINOPEC, Jiangsu Jiangdu ;4.Zhejiang Division of Petroleum Exploration, CNPC,  Zhejiang
Abstract:Based on the basement features, the unique sedimento-igneous formation and deformation of the Sinian—Mesozoic, and the exclusive chatacters for regional mineralization and tectono-thermal events, as well as the paleomagnetic data, the Su—Wan (an abbreviation for Jiangsu and Anhui Provinces) Block might be considered as an independent tectonic unit during the period of Tethyan evolution. The Su—Lu (an abbreviation for Jiangsu and Shandong Provinces) Ocean, which once separated the Su—Wan Block from the North China Craton, finally closed in Late Jurassic and Early Cretaceous, and the Su—Lu Orogen was a part of the East Asian Yanshanides. The Early Precambrian of the Su—Wan Block might be a part of the North China Craton. It drifted away, and correspondingly, the Su—Lu Ocean opened in Middle-Late Proterozoic. The Su—Wan Block attached to the Yangtze tectonic domain during the Sinan and Early Paleozoic, and its sedimento-volcanic formation and deformation had some differences from that of the Yangtze Craton. The global tectonic framework changed greatly from Devonian when the Paleotethyan oceanic basins opened. Glacial activity and cold water faunas characterized the Gondwana in Permian, while a mantle plume recorded by eruption of the Emeishan basalt featured the Yangtze Craton. During that time the Su—Wan Block, not affected by the mantle plume, might be a median block in the Paleotethyan marine, which was evidenced by the sediments being affected by the glacial activity and the mixed faunas (although no cold water faunas discovered). In other words, The Su—Wan Block must have been independent away from the Yangtze Craton since the latest Carboniferous. The Su—Lu Ocean once subducted in Triassic, but not closed, so the Late Triassic plant fossils in Su—Wan Block differed from that of the Yangtze Craton. The remained ocean subducted and closed in Late Jurassic and Early Cretaceous, indicated by the widely occurred Andean-type arc magmatism. From then on the Su—Wan Block collided with the North China Craton and became a part of the embryonic Asia continent.
Keywords:Su Wan Block   formation deformation features   Tethys   Su Lu Ocean
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