| 华南某些含锡斑岩的岩石化学与地球化学特征 |
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| 引用本文： | 胡祥昭,陈惜华.华南某些含锡斑岩的岩石化学与地球化学特征[J].中南大学学报(自然科学版),1990(1). |
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| 作者姓名： | 胡祥昭 陈惜华 |
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| 作者单位： | 中南矿冶学院地质系，中南矿冶学院地质系 |
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| 摘 要： | 华南某些含锡斑岩体的化学成分以富硅、贫钙、镁、铁、富碱为特征。其分异指数(DI)一般在90％以上,固结指数低于3,属张裂性花岗岩。根据闻广提出的含锡岩体b值在1～8之间,s值在79～84之间的看法,含锡斑岩的b值和s值均位于锡矿化区间。含锡斑岩体的微量元素以高氟、富铷、贫锶、贫钡为特征。铌钽比值近于1。稀土元素分析表明:∑REE含量较高,相对富集重稀土,铕出现显著负异常。初始锶同位素比值(~(86)Sr/~(87)Sr)_i等于0.711～0.716。说明含锡斑岩体的岩浆系由下部地壳物质重熔而成。
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| 关 键 词： | 斑岩 岩石学 地球化学/华南 |
THE PETROCHEMICAL AND GEOCHEMICAL CHARACTE-RISTICS OF SOME TIN-BEARING PORPHYRY IN THE SOUTH OF CHINA |
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| Hu Xiangzhao,Chen Xihua.THE PETROCHEMICAL AND GEOCHEMICAL CHARACTE-RISTICS OF SOME TIN-BEARING PORPHYRY IN THE SOUTH OF CHINA[J].Journal of Central South University:Science and Technology,1990(1). |
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| Authors: | Hu Xiangzhao Chen Xihua |
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| Institution: | Hu Xiangzhao;Chen Xihua Department of Geology |
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| Abstract: | The characteristics of the chemical composition of the tin-bearing porphyriesare rich in silicon and alkali contents, but poor in calcium, magnesium and ironwith the differentiation index (DI)>90 and the solidification index (SI)<3,belonging to tension granite. Based on Wen Guang the b values and the s valuesof tin-bearing bodies respectively vary between 1 and 8 and between 79 and 84,so both values of b and s of the tin-bearing porphyries are in the tin-mineralizationspace. The characteristics of their trace elements are rich in Rb and Fcontents and poor in Sr and Ba. The ratio of Nb/Ta is about 1. As shown bythe REE analysis, REE contents is higher. Compared with the granite of SouthChina, the tin-bearing porphyries have higher HREE contents and an obviousnegative Eu anomaly. The initial ratio of ~(87)Sr/~(86)Sr is 0.711 to 0.716, whichindicates that the tin-bearing porphyries are the product of remelting the lowcrust. |
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| Keywords: | porphyry petrography geochemistry/the south of China |
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