ISSN 1009-6248CN 61-1149/P 双月刊

主管单位：中国地质调查局

主办单位：中国地质调查局西安地质调查中心
中国地质学会

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    祁生胜, 王毅智, 何世豪, 宋生春, 祁正林, 王福林. 唐古拉地区尕羊晚二叠世碰撞型花岗岩的确定和构造意义[J]. 西北地质,2009,42(3): 26-35.
    引用本文: 祁生胜, 王毅智, 何世豪, 宋生春, 祁正林, 王福林. 唐古拉地区尕羊晚二叠世碰撞型花岗岩的确定和构造意义[J]. 西北地质,2009,42(3): 26-35.
    shu
    QI Sheng-sheng, WANG Yi-zhi, HE Shi-hao, SONG Sheng-chun, QI Zheng-ling, WANG Fu-lin. The Assurance of Syncollisional Granite in Tanggula Area During Late Permian Epoch and Its Significance[J]. Northwestern Geology,2009,42(3): 26-35.
    Citation: QI Sheng-sheng, WANG Yi-zhi, HE Shi-hao, SONG Sheng-chun, QI Zheng-ling, WANG Fu-lin. The Assurance of Syncollisional Granite in Tanggula Area During Late Permian Epoch and Its Significance[J]. Northwestern Geology,2009,42(3): 26-35.
    shu

    唐古拉地区尕羊晚二叠世碰撞型花岗岩的确定和构造意义

    The Assurance of Syncollisional Granite in Tanggula Area During Late Permian Epoch and Its Significance

      摘要
    • 摘要: 在龙木错-双湖-澜沧江缝合带北侧,沿青海省囊谦县尕羊及其以西,新发现呈北西向带状分布的晚二叠世正长花岗岩侵入体.其岩性为中细粒含白云母正长花岗岩,岩石以酸性程度高、富硅、富碱、富铝及非常高的稀土含量为特点,岩石的铝过饱和指数ASI平均值达1.166,CIPW标准矿物中刚玉分子平均为5.08,为典型的高钾钙碱性系列的过铝质花岗岩.其岩石类型相当MPG含白云母过铝质花岗岩类;岩石ΣREE高达466.55×10-6～682.80×10-6,具有强的Eu负异常,δEu平均值为0.06,微量元素含量富不相容元素(LILE),贫高场强元素(HFSE),具有典型的S型花岗岩的特征,与冈底斯碰撞花岗岩特征近一致,构造分析相当于Maniar花岗岩分类中的CCG花岗岩(大陆碰撞花岗岩).在尕羊正长花岗岩中获得了251.4±0.6Ma的TIMS法锆石U-Pb同位素年龄,其形成时代为晚二叠世,与在乌兰乌拉湖-澜沧江结合带内获得的251.5±2.6Ma和249±49Ma热年代信息一致,反映晚二叠世—早三叠世构造热事件的存在,可能属于晚二叠世—早三叠世乌兰乌拉湖-澜沧江结合带陆-陆碰撞的产物.

       

      Abstract: In northern Qiangtang-Changdu plate of Longmucuo-Shuanghu-Lancangjiang suture zone,the syenitegranite mass of late Permian Epoch is disjointed from the granites of Yanshannia Age.The component of the rocks is characterized by Al2O3>CaO+Na2O+K2O,with the average value of ASI reaching 1.166,showing the character of typical peraluminous granite;in addition,the ΣREE value of the rock is as high as 466.55×10-6~2682.80×10-6,with the average value of of δEu being 0.06,showing the character of typical S-type granites.The rock type is equivalent MPG-granite and is in terpreted as the syncollisional granite.The zircon U-Pb isotope age is 251.4±0.6 Ma,indicating that the implacement age is in late Permian Epoch.All these reflecta tectonic-thermal event during late Permian Epoch to Triassic Epoch,which might be the tectonic outcome of continent-continent collision in Wulan lualake-Lancangjiang suture zone.

       

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