| 骑田岭花岗岩体的岩浆混合成因:寄主岩及其暗色闪长质微细粒包体的锆石U-Pb年龄和Hf同位素证据 |
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| 引用本文： | 刘,勇 肖庆辉 耿树方 王晓霞 陈必河.骑田岭花岗岩体的岩浆混合成因:寄主岩及其暗色闪长质微细粒包体的锆石U-Pb年龄和Hf同位素证据[J].中国地质,2010,37(4):1081-1091. |
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| 作者姓名： | 刘 勇 肖庆辉 耿树方 王晓霞 陈必河 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 湖南省地质调查研究院,湖南,湘潭,411100 |
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| 基金项目： | 中国地质构造区划与区域地质调查综合集成，深部探测项目 |
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| 摘 要： | 南岭骑田岭复式岩体仰天湖单元燕山期二长花岗岩中广泛分布有暗色闪长质微细粒包体,这些包体主要呈被打散的片云状或次圆状,大小不等,颜色较寄主岩深,粒度较细。本文在锆石内部结构的CL图像特征研究基础上,用LA-ICP-MS和MC-ICP-MS测定了锆石U-Pb年龄及Hf同位素组成,探讨了寄主二长花岗岩、闪长质微细粒包体的锆石U-Pb年代学及Hf同位素组成特征。获得寄主二长花岗岩、闪长质微细粒包体的结晶年龄为(166.0±2.0)Ma和(169.8±4.1)Ma,对应的εHf(t)值为-13.2～-1.9与-8.3～+6.7。研究表明,骑田岭复式岩体中的仰天湖岩体是以古老地壳物质熔融为主体的壳源岩浆与幔源岩浆高度混合的产物。
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| 关 键 词： | 暗色闪长质微细粒包体 二长花岗岩 锆石U-Pb定年 Hf同位素 岩浆混合 南岭 |
Magmatic mingling origin of adamellite: zircon U-Pb dating and Hf isotopes evidence of microgranular dioritic enclaves and host rocks from Yangtianhu adamellite of Qitianling, South China |
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| LIU Yong,XIAO Qing-hui,GENG Shu-fang,WANG Xiao-xi,CHEN Bi-he.Magmatic mingling origin of adamellite: zircon U-Pb dating and Hf isotopes evidence of microgranular dioritic enclaves and host rocks from Yangtianhu adamellite of Qitianling, South China[J].Chinese Geology,2010,37(4):1081-1091. |
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| Authors: | LIU Yong XIAO Qing-hui GENG Shu-fang WANG Xiao-xi CHEN Bi-he |
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| Institution: | LIU Yong,XIAO Qing-hui1,GENG Shu-fang1,WANG Xiao-xia1,CHEN Bi-he2(1.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China,2.Hunan Institute of Geological Survey,Xiangtan 411100,Hunan,China) |
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| Abstract: | A large number of directional microgranular dioritic enclaves occur in Yangtianhu adamellite of Qitianling composite body.Microgranular dioritic enclaves,which commonly show cloudleted and sub-rounded shapes,display igneous textures and are from meter to centimeter in size.These enclaves are darker in color and finer in granularity than their hosting adamellite.Based on an analysis of the inner structural CL images of zircons,this paper discusses U-Pb ages and Hf isotopes of zircons from the host adamellite... |
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| Keywords: | microgranular dioritic enclaves adamellite zircon U-Pb dating Hf isotope mingling between the crust-and mantlederived magma Qitianling |
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