| 东秦岭金堆城花岗斑岩体的锆石U-Pb年龄、物质来源及成矿机制 |
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| 引用本文： | 焦建刚,汤中立,钱壮志,袁海潮,闫海卿,孙涛,徐刚,李小东.东秦岭金堆城花岗斑岩体的锆石U-Pb年龄、物质来源及成矿机制[J].地球科学,2010(6). |
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| 作者姓名： | 焦建刚 汤中立 钱壮志 袁海潮 闫海卿 孙涛 徐刚 李小东 |
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| 作者单位： | 长安大学地球科学与资源学院;矿产资源与地质工程教育部重点实验室;西北有色地质勘查局712总队; |
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| 基金项目： | 长安大学科技创新基础研究项目(Nos.CHD2009JC044,CHD2010ZD005); 公益性行业科研专项(Nos.200911007-5,201011058); 深部探测技术与试验研究专项(SinoProbe-05-01) |
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| 摘 要： | 通过LA-ICP-MS方法测得金堆城和老牛山花岗岩体中锆石U-Pb年龄分别为143.7±3Ma和144.5±4.4Ma,与金堆城钼矿床中辉钼矿的Re-Os年龄139±3.0Ma在误差范围内一致,界定了金堆城成岩成矿时代为侏罗纪末-白垩纪初,2个岩体为同期岩浆事件的产物,与燕山运动有关.金堆城岩体较老牛山岩体富SiO2、K2O,岩石地球化学数据显示2个岩体都具有一致的高硅、富碱、过铝质系列和钙碱性岩石系列特征;高的Sεr(t)、低的εNd(t)及Pb同位素图解证明2个岩体主要来自下地壳物质部分熔融,可能有少量地幔物质加入.年代学与岩石地球化学数据证实老牛山岩体和金堆城岩体的岩浆源区与岩石成因相同,推测老牛山岩体在深部发生分异演化,为金堆城小岩体提供了大量的热液和矿物质,从而出现了金堆城小岩体成大矿现象.
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| 关 键 词： | 锆石U-Pb年龄 成矿机制 花岗岩 地球化学 |
Metallogenic Mechanism,Magma Source and Zircon U-Pb Age of Jinduicheng Granitic Porphyry,East Qinling |
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| JIAO Jian-gang,TANG Zhong-li,QIAN Zhuang-zhi,YUAN Hai-chao,YAN Hai-qing,SUN Tao,XU Gang,LI Xiao-dong .School of Earth Science , Resources,Chang''an University,Xi''an ,China .Key Laboratory of Western China''s Mineral Resources , Geological Engineering,Ministry of Education,China . Team of Northwestern Geology Exploration Bureau for Nonferrous Metal Resources,Xianyang ,China.Metallogenic Mechanism,Magma Source and Zircon U-Pb Age of Jinduicheng Granitic Porphyry,East Qinling[J].Earth Science-Journal of China University of Geosciences,2010(6). |
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| Authors: | JIAO Jian-gang TANG Zhong-li QIAN Zhuang-zhi YUAN Hai-chao YAN Hai-qing SUN Tao XU Gang LI Xiao-dong School of Earth Science Resources Chang'an University Xi'an China Key Laboratory of Western China's Mineral Resources Geological Engineering Ministry of Education China Team of Northwestern Geology Exploration Bureau for Nonferrous Metal Resources Xianyang China |
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| Institution: | JIAO Jian-gang1,2,TANG Zhong-li1,QIAN Zhuang-zhi1,YUAN Hai-chao3,YAN Hai-qing1,SUN Tao1,XU Gang1,LI Xiao-dong1 1.School of Earth Science and Resources,Chang'an University,Xi'an 710054,China 2.Key Laboratory of Western China's Mineral Resources and Geological Engineering,Ministry of Education,China 3.712 Team of Northwestern Geology Exploration Bureau for Nonferrous Metal Resources,Xianyang 712000,China |
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| Abstract: | |
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| Keywords: | zircon U-Pb isotopic age metallogenic mechanism granite geochemistry |
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