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郯庐断裂带的演化及其对西太平洋板块运动的响应
引用本文:朱光,王道轩,刘国生,牛漫兰,宋传中.郯庐断裂带的演化及其对西太平洋板块运动的响应[J].地质科学,2004,39(1):36-49.
作者姓名:朱光  王道轩  刘国生  牛漫兰  宋传中
作者单位:合肥工业大学资源与环境工程学院, 合肥, 230009
摘    要:首次从郯庐断裂带走滑糜棱岩中获得了白云母127.62±0.19Ma的40Ar-39Ar年龄,其与糜棱岩的全岩40Ar-39Ar年龄相吻合。这些年代学研究成果以及同走滑期岩浆活动,表明郯庐断裂带于早白垩世发生了大规模的左行平移。这一早白垩世构造—岩浆事件是伊泽纳崎板块突然发生高速、斜向俯冲的结果。晚白垩世早第三纪郯庐断裂带转变成巨型的伸展构造,普遍控制发育了断陷盆地。太平洋板块的高角度正向俯冲使中国东部出现软流圈上涌、岩石圈拆沉,从而造成了郯庐断裂带与整个中国东部卷入了强烈的伸展活动。晚第三纪初期起动的挤压活动,使郯庐断裂带上的断陷盆地同步抬升和闭合;断裂带的逆冲活动则断续延至今日,成为中国东部最大的近代地震活动带。郯庐断裂带晚第三纪以来的挤压活动是西太平洋弧后扩张的响应,而印度板块碰撞的构造挤出起着辅助作用。

关 键 词:同位素年龄  构造演化  伊泽纳崎板块  太平洋板块  郯庐断裂带
文章编号:0563-5020(2004)01-0036-14
收稿时间:2002-03-25
修稿时间:2002年3月25日

EVOLUTION OF THE TAN-LU FAULT ZONE AND ITS RESPONSES TO PLATE MOVEMENTS IN WEST PACIFIC BASIN
Zhu Guang,Wang Daoxuan,Liu Guosheng,Niu Manlan,Song Chuanzhong.EVOLUTION OF THE TAN-LU FAULT ZONE AND ITS RESPONSES TO PLATE MOVEMENTS IN WEST PACIFIC BASIN[J].Chinese Journal of Geology,2004,39(1):36-49.
Authors:Zhu Guang  Wang Daoxuan  Liu Guosheng  Niu Manlan  Song Chuanzhong
Institution:College of Resource and Environment Engineering, Hefei University of Technology, Hefei 230009
Abstract:A muscovite 40Ar-39Ar age of 127.62?0.19 Ma was firstly obtained from strike slip mylonite in the Tan-Lu fault,which was consistent with mylonite whole rock 40Ar-39Ar ages.The isotopic dating as well as syn-strike-slip magmatism showed that a large-scale strike-slip movement of the Tan-Lu fault zone occurred in Early Cretaceous.The Early Cretaceous tectono magmatism event resulted from a suddenly high-speed and oblique subduction of the Izanagi plate.The Tan-Lu fault zone turned into a huge extensional structure during Late Cretaceous to Eogene,leading to a series of development of fault-bounded basins.It was suggested that extensional activities of the Tan-Lu fault zone might be related to asthenospheric upwelling and lithospheric delamination in East China caused by high-angle,orthogonal subduction of the Pacific plate.The compressive activities from the earliest Neogene closed the above-mentioned basins.The thrusting of the Tan-Lu fault zone lasted to present days with several intervals.Therefore,the fault zone became the largest earthquake belt in East China.The post-Eogene compressive activity was a response to backarc spreading in West Pacific area,and the extrusion from the Indian plate collision also played a partial role in the E-W compression in East China.
Keywords:Isotopic ages    Tectonic evolution    The Izanagi plate    The Pacific plate  The Tan  Lu fault zone
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