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高黎贡构造带花岗岩的年代学和地球化学及其构造意义
引用本文:杨启军,徐义刚,黄小龙,罗震宇.高黎贡构造带花岗岩的年代学和地球化学及其构造意义[J].岩石学报,2006,22(4):817-834.
作者姓名:杨启军  徐义刚  黄小龙  罗震宇
作者单位:中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广州,510640
摘    要:产于高黎贡山脉的花岗岩(简称高黎贡花岗岩)记录中生代以来高黎贡构造带形成、演化的全部过程,高黎贡花岗岩的成因研究对于查明东喜马拉雅构造结的形成和演化乃至整个冈底斯地块的演化过程具有重要意义.高黎贡花岗岩为一套由黑云母二长花岗岩、二云母二长花岗岩、花岗岩组成的花岗质杂岩体,空间上构成一条南北向分布的挟持于怒江剪切带和龙川江剪切带之间狭长透镜体.地球化学特征研究揭示,高黎贡花岗岩为高钾钙碱性、过铝-强过铝花岗岩,其岩浆来源于中、下地壳前寒武纪变质岩的深熔作用.花岗岩源区成分不均一,以变质硬砂岩为主,并含有变质玄武岩,形成于岛弧-陆陆碰撞环境.SHRIMP锆石U-Pb定年表明,高黎贡花岗岩形成于早白垩世晚期(126~118Ma),其年龄、地球化学特征与拉萨地块北缘花岗岩一致,说明它为冈底斯构造岩浆岩带的东延部分,是中特提斯怒江洋洋壳向南俯冲和海洋闭合过程的岩浆响应,而与新特提斯雅鲁藏布江洋的演化无关.

关 键 词:高黎贡构造带  花岗岩  成因  地球化学  地质年代学  中特提斯  怒江洋  碰撞
文章编号:1000-0569/2006/022(04)-0817-34
收稿时间:12 20 2005 12:00AM
修稿时间:02 24 2006 12:00AM

Geochronology and geochemistry of granites in the Gaoligong tectonic belt,western Yunnan:Tectonic implications.
YANG QiJun XU YiGang HUANG XiaoLong LUO ZhenYu Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,China.Geochronology and geochemistry of granites in the Gaoligong tectonic belt,western Yunnan:Tectonic implications.[J].Acta Petrologica Sinica,2006,22(4):817-834.
Authors:YANG QiJun XU YiGang HUANG XiaoLong LUO ZhenYu Key Laboratory of Isotope Geochronology and Geochemistry  Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  China
Institution:Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
Abstract:The origin and evolution of the Gaoligong tectonic belt,which is located on the east of eastern Himalaya syntaxis,is pivotal to understanding the genesis of the Gandese Block.For this purpose,studies have been carried out on the granitoids in the Gaoligong area with focus on the field relationship,crystallized ages,mineralogical and geochemical characteristics and their tectonic significance.The Gaoligong pluton complex,bounded by the Nujiang Fault in east and Sagain Fault in west,form an elongated ductile deformation zone.The granites are intensively deformed along the peripheries of the faults but show little deformation in the center. They are mainly composed of biotite monzogranite,biotite granite,two-mica granites.Geochemical analyses suggest that these peraluminous to strongly peraluminous granites were formed by anatexis of precambrian continental crust in a arc to post-collisional setting.The source rocks lie in the middle crust and are heterogeneous including both meta-sediments and meta-basalts.The SHRIMP U-Pb zircon dating indicates that they were emplaced during the early Cretaceous(118 to 126 Ma).The Gaoligong granites share geochemical and chronological similarities with the Gandese granites,suggesting that they represent eastern extension of the Gandese belt.It is proposed that the Gaoligong granites resulted from crustal melting during the southward subduction of the Meso-Tethys oceanic lithosphere undemeath the Gandese Block.
Keywords:Gaoligong tectonic belt  Granite  Genesis  Geochronology  Geochemistry Meso-Tethys  Nujiang Ocean  Collision
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