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| 云南中甸地区浪都高钾中酸性侵入岩的地球化学特征 | |
| 引用本文： | 任涛,钟宏,陈金法,朱维光,张兴春.云南中甸地区浪都高钾中酸性侵入岩的地球化学特征[J].矿物学报,2011,31(1):43-54. |
| 作者姓名： | 任涛 钟宏 陈金法 朱维光 张兴春 |
| 作者单位： | 1. 中国科学院,地球化学研究所矿床地球化学国家重点实验室,贵州,贵阳,550002;中国科学院,研究生院,北京,100039 2. 中国科学院,地球化学研究所矿床地球化学国家重点实验室,贵州,贵阳,550002 3. 贵州省地质矿产资源开发股份有限公司,贵州,贵阳,550004 |
| 基金项目： | 中国科学院知识创新工程重要方向项目，中国科学院"百人计划" |
| 摘 要： | 中甸地区浪都中酸性侵入岩在空间上与浪都夕卡岩型铜矿床共生,主要由石英二长斑岩、石英闪长斑岩和花岗闪长斑岩组成。这些侵入岩大多表现出高钾(K2O大于3%)的特征,在K2O-SiO2图上所有样品均落入高钾钙碱性和钾玄岩区域。在稀土元素球粒陨石标准化图上表现为轻稀土富集、重稀土亏损(LaN/YbN=14.3～21.2)、铕弱负异常至无异常(δEu=0.77～1.00);在原始地幔标准化微量元素蛛网图上,K、Rb、Sr、Ba等元素表现出正异常,而Nb、Ta和Ti等元素表现出负异常的特征。浪都侵入岩的87Sr/86Sr初始值为0.7044～0.7069,εNd(t)值为-2.8～-2.2。结合主量、微量元素及Sr-Nd同位素组成,本研究认为浪都岩浆来源于交代地幔,很可能受到了俯冲带流体交代和地壳物质混染的影响,表明浪都中酸性侵入岩的形成与甘孜-理塘洋的俯冲有关。 |
| 关 键 词： | 高钾中酸性侵入岩 地球化学 Sr-Nd同位素 岩石成因 浪都 云南 |
Geochemical Characteristics of the Langdu High-K Intermediate-Acid Intrusive Rocks in the Zhongdian Area, Northwest Yunnan Province, P.R.China |
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| REN Tao,ZHONG Hong,CHEN Jin-fa,ZHU Wei-guang,ZHANG Xing-chun.Geochemical Characteristics of the Langdu High-K Intermediate-Acid Intrusive Rocks in the Zhongdian Area, Northwest Yunnan Province, P.R.China[J].Acta Mineralogica Sinica,2011,31(1):43-54. | |
| Authors: | REN Tao ZHONG Hong CHEN Jin-fa ZHU Wei-guang ZHANG Xing-chun |
| Institution: | REN Tao1,2,ZHONG Hong1,CHEN Jin-fa3,ZHU Wei-guang1,ZHANG Xing-chun1(1.State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China,2.Graduate University of Chinese Academy of Sciences,Beijing 100039,3.Guizhou Province Geological Mineral Resources Exploitation Stock Co.,Ltd,Guiyang 550004,China) |
| Abstract: | The Langdu high-K calc-alkaline intrusive rocks in the Zhongdian area of northwestern Yunnan Province,China are spatially associated with the Langdu skarn copper deposit.These rocks consist mainly of quartz-diorite porphyry,granodiorite and quartz-monzonite porphyry.The K2O content of majority is higher than 3%,and in the K2O-SiO2 diagram,all the samples fall into the high-K calc alkaline to shoshonitic fields.They are enriched in LREE and depleted in HREE(La/Yb)N = 14.3 ~ 21.2),and show negative to no Eu a... |
| Keywords: | intrusive rock geochemistry Sr-Nd isotopes intrusion Langdu Yunnan Province |
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