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江南造山带形成过程中若干新元古代地质事件

被引：80
作者：
周金城
王孝磊
邱检生
机构：
[1] 南京大学地球科学与工程学院,成矿作用国家重点实验室
来源：
高校地质学报 | 2009年 / 04期
关键词：
U-Pb锆石定年; 高Mg玄武岩; 后造山基性岩; 砂岩; 江南造山带;
D O I：
10.16108/j.issn1006-7493.2009.04.003
中图分类号：
P542.2 [];
学科分类号：
摘要：
报道了江南造山带(中-)西段在"俯冲造山阶段"形成的科马提质玄武岩、石英角斑岩、流纹质凝灰岩及"后造山伸展阶段"形成的两类基性岩的特征,研究表明,科马提质玄武岩是形成于岛弧环境的高MgO玄武岩。高的Ni和Cr含量说明它们为来自弧下地幔的原始岩浆,较高的MgO显示这些高MgO玄武岩浆是在相对较干的条件下从地幔源区分离的。"后造山伸展阶段"形成的两种基性岩分别来自软流圈和岩石圈地幔,具有不同的地球化学特征。基底地层中砂岩的碎屑锆石及夹层中基性—酸性火山岩的锆石U-Pb定年表明,在扬子板块东南缘,新元古代岛弧岩浆活动的时间约为878～822Ma,岛弧地区陆源碎屑的沉积作用发生在872～835Ma期间,表明存在同时代的(coeval)"岛弧岩浆作用"和"沉积作用"。
引用
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页码：453 / 459
页数：7
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  • [1] 龙胜地区镁铁质侵入体:年龄及其地质意义
    葛文春
    李献华
    李正祥
    周汉文
    [J]. 地质科学, 2001, (01) : 112 - 118
  • [2] Study of the High Pressure Metamorphic Blueschist and Its Late Proterozoic Age in the Eastern Jiangnan Belt[J]. 舒良树,周国庆,施央申,殷俊.Chinese Science Bulletin. 1994(14)
  • [3] Geochronology and Hf isotopes of zircon from volcanic rocks of the Shuangqiaoshan Group, South China: Implications for the Neoproterozoic tectonic evolution of the eastern Jiangnan orogen[J] . Xiao-Lei Wang,Guochun Zhao,Jin-Cheng Zhou,Yongsheng Liu,Jian Hu.Gondwana Research . 2008 (3)
  • [4] Rift melting of juvenile arc-derived crust: Geochemical evidence from Neoproterozoic volcanic and granitic rocks in the Jiangnan Orogen, South China[J] . Yong-Fei Zheng,Rong-Xin Wu,Yuan-Bao Wu,Shao-Bing Zhang,Honglin Yuan,Fu-Yuan Wu.Precambrian Research . 2008 (3)
  • [5] Detrital zircon geochronology of Precambrian basement sequences in the Jiangnan orogen: Dating the assembly of the Yangtze and Cathaysia Blocks[J] . Xiao-Lei Wang,Jin-Cheng Zhou,W.L. Griffin,Ru-Cheng Wang,Jian-Sheng Qiu,S.Y. O’Reilly,Xisheng Xu,Xiao-Ming Liu,Gui-Lin Zhang.Precambrian Research . 2007 (1)
  • [6] Origin and geodynamic significance of Tertiary postcollisional basaltic magmatism in Serbia (central Balkan Peninsula)[J] . LITHOS . 2004 (3)
  • [7] Geochemistry of the Meso- to Neoproterozoic basic–acid rocks from Hunan Province, South China: implications for the evolution of the western Jiangnan orogen[J] . Xiaolei Wang,Jincheng Zhou,Jiansheng Qiu,Jianfeng Gao.Precambrian Research . 2004 (1)
  • [8] Source and H 2 O content of high-MgO magmas in island arc settings: an experimental study of a primitive calc-alkaline basalt from St. Vincent, lesser antilles arc[J] . M Pichavant,B.O Mysen,R Macdonald.Geochimica et Cosmochimica Acta . 2002 (12)
  • [9] Geochemical evolution of lithospheric mantle beneath S.E. South Australia[J] . John Foden,Suck Hwan Song,Simon Turner,Marlina Elburg,P.B. Smith,B. Van der Steldt,D. Van Penglis.Chemical Geology . 2002 (2)
  • [10] Cenozoic extension and magmatism in the North American Cordillera: the role of gravitational collapse[J] . Mian Liu.Tectonophysics . 2001 (3)
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