| Isotope Geochemical Characteristics and Material Sources of Tin--Bearing Porphyries in South China |
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| 作者姓名： | Shen Weizhou Wang Dezi and Liu Changshi |
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| 作者单位： | Shen Weizhou;Wang Dezi and Liu Changshi Department of Earth Sciences，Nanjng University，Nanjng，Jiangsu |
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| 基金项目： | Note:This research was supported by the China National Natural Science Foundation Grant No.49070092. |
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| 摘 要： | Tin-bearing porphyries in South China can be divided into the F-rich and F-poorsubtypes. They are high-silica (SiO_2>71%), peraluminous (A/NKC>1.0) and rich inincompatible elements (Rb, Zr, U, W, Sn) and have weak Ce (δCe=0.68-0.82) and strong Eu(δEu=0.01-0.38) negative anomalies. Meantime, they also have low δ_(Nd)(-6.3- -8.4), high~(207)Pb/~(204)Pb (15.588-15.790), medium to high (~(87)Sr/~(86)Sr)_i (0.7084-0.7287) and relatively highδ~(18)O(9.1-10.3‰). These characteristics clearly suggest that the two subtypes of tin-bearingporphyries were derived from the crustal materials. Their differences lie only in the existence ofcertain different components in their source materials. Therefore, there is only one type oftin-bearing prophyry in South China. that is continental crust transformation type.
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Isotope Geochemical Characteristics and Material Sources of Tin--Bearing Porphyries in South China |
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| Authors: | Shen Weizhou Wang Dezi and Liu Changshi |
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| Institution: | Shen Weizhou,Wang Dezi and Liu Changshi Department of Earth Sciences,Nanjng University,Nanjng,Jiangsu |
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| Abstract: | Abstract Tin—bearing porphyries in South China can be divided into the F—rich and F—poor subtypes. They are high—silica (SiO2>71%), peraluminous (A/NKC>1.0) and rich in incompatible elements (Rb, Zr, U, W, Sn) and have weak Ce (δCe = 0.68-0.82) and strong Eu (δEu = 0.01—0.38) negative anomalies. Meantime, they also have low εNd(-6.3- -8.4), high 207Pb/ 204Pb (15.588-15.790), medium to high (87Sr/ 86Sr)i (0.7084-0.7287) and relatively high δl8O (9.1—lO.3%o). These characteristics clearly suggest that the two subtypes of tin-bearing porphyries were derived from the crustal materials. Their differences lie only in the existence of certain different components in their source materials. Therefore, there is only one type of tin-bearing prophyry in South China, that is continental crust transformation type. |
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| Keywords: | tin-bearing porphyry isotope material source South China |
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