云南中甸地区浪都高钾中酸性侵入岩的地球化学特征
Geochemical Characteristics of the Langdu High-K Intermediate-Acid Intrusive Rocks in the Zhongdian Area, Northwest Yunnan Province, P.R. China
查看参考文献36篇
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文摘
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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(K_2O大于3%)的特征, 在K_2O-SiO_2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(La_N/Yb_N= 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~(87)Sr/~(86)Sr初始值为0.7044~ 0.7069, ε_(Nd)(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 |
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其他语种文摘
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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 K_2O content of majority is higher than 3%, and in the K_2O-SiO_2 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 anomaly(δEu=0.77~1.00).In the primitive-mantle normalized spidergram, they are enriched in K, Rb, Sr, Ba, but depleted Nb, Ta and Ti.The samples have relatively enriched Sr-Nd isotopic compositions with(~(87)Sr/~(86)Sr)_i ratios from 0.7044 to 0.7069 andε_(Nd)(t)values from-2.8 to-2.2.In combination of the above elemental and isotopic characteristics, it is suggested that the Langdu intrusives were derived from a metasomatized mantle source generated by subduction-released fluids and involvement of crustal material, which are related to subduction of the Garze-Litang Ocean |
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来源
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矿物学报
,2011,31(1):43-54 【核心库】
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关键词
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高钾中酸性侵入岩
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地球化学
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Sr-Nd同位素
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岩石成因
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浪都
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云南
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地址
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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
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贵州省地质矿产资源开发股份有限公司, 贵州, 贵阳, 550004
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程重要方向项目
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:4173021
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