| Yttrium zoning in garnet from the Xihuashan granitic complex and its petrological implications |
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| 作者姓名： | WANGRucheng HUHuan ZHANGAicheng XUShijin WANGDezi |
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| 作者单位： | StateKeyLaboratoryforMineralDepositsResearch,DepartmentofEarthSciences,NanjingUniversity,Nanjing210093,China |
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| 基金项目： | 国家自然科学基金，教育部科学技术研究项目 |
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| 摘 要： | The Xihuashan granitic complex is characterized by enrichment in rare-earth elements (REE). In particular, the second-stage granite (G-b) is markedly enriched in yttrium, and therefore contains complex associations of Y-bearing minerals. In this granite, garnet displays specific yttrium zoning with an Y-rich core and a “clean“ rim. Besides minute inclusions of Y-bearing minerals, garnet involves a striking amount of Y and HREE in its central area.It is suggested that enrichment in Y in the garnet core accords with that in the melt as a result of REE magmatic fractionation. However, the “clean“ rim may be the direct result of accumulation of fluid phases in the magma, which is virtually unfavorable for the entrance of REE in the garnet structure.
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| 关 键 词： | 钇 石榴石 花岗岩 岩石学 岩浆 水热作用 |
| 收稿时间： | 2003-03-07 |
Yttrium zoning in garnet from the Xihuashan granitic complex and its petrological implications |
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| WANGRucheng HUHuan ZHANGAicheng XUShijin WANGDezi.Yttrium zoning in garnet from the Xihuashan granitic complex and its petrological implications[J].Chinese Science Bulletin,2003,48(15):1611-1615. |
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| Authors: | Rucheng Wang Huan Hu Aicheng Zhang Shijin Xu Dezi Wang |
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| Institution: | e-mail: rcwang@nju.edu.cn |
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| Abstract: | The Xihuashan granitic complex is characterized by enrichment in rare-earth elements (REE). In particular, the second-stage granite (G-b) is markedly enriched in yttrium, and therefore contains complex associations of Y-bearing minerals. In this granite, garnet displays specific yttrium zoning with an Y-rich core and a "clean" rim. Besides minute inclusions of Y-bearing minerals, garnet involves a striking amount of Y and HREE in its central area. It is suggested that enrichment in Y in the garnet core accords with that in the melt as a result of REE magmatic fractionation. However, the "clean" rim may be the direct result of accumulation of fluid phases in the magma, which is virtually unfavorable for the entrance of REE in the garnet structure. |
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| Keywords: | garnet zoning yttrium magmatic-hydrothermal process the Xihuashan granitic complex |
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