| Characteristics of rare-earth elements （REE）, strontium and neodymium isotopes in hydrothermal fluorites from the Bailashui tin deposit in the Furong ore field,southern Hunan Province,China |
| |
| 作者姓名： | YUAN Shunda ;PENG Jiantang ;HU Ruizhong ;BI Xianwu ;QI Liang ;LI Zhaoli ;LI Xiaomin ;SHUANG Yan |
| |
| 作者单位： | YUAN Shunda1，2，3，PENG Jiantang1，HU Ruizhong1，BI Xianwu1，QI Liang1，LI Zhaoli1，LI Xiaomin1，and SHUANG Yan1，2 1 State Key Laboratory of Ore Deposit Geochemistry，Institute of Geochemistry，Chinese Academy of Sciences，Guiyang 550002，China 2 Graduate School，Chinese Academy of Sciences，Beijing 100049，China 3 Institute of Mineral Resources，Chinese Academy of Geological Sciences，Beijing 100037，China |
| |
| 基金项目： | 教育部改革创新计划项目
，
国家自然科学基金
，
Special Foundation on Fundamental Scientific Research as Operating Expenses among Commonweal Scientific Research Institutes at National Level
|
| |
| 摘 要： | In this paper the authors present the REE concentrations and Sr and Nd isotopic compositions of fluorites from the Bailashui tin deposit of the Furong ore field, southern Hunan Province. The results showed that the total amount of REE in fluorites is usually low, ranging from 0.705 to 8.785 μg/g with the chondrite-normalized REE distribution patterns similar to those of the Qitianling granites in the study area, characterized by LREE-enrichment patterns with pronounced negative Eu anomalies. The fluorites vary in Sr isotopic composition within the range of 0.7083-0.7091, the values are lower than those of the granites and higher than those of the host carbonate rocks in this area. The εNd（t） values of fluorites vary between -9.4 and ＋10.3, revealing that both the crust- and mantle-source materials were involved in the ore-forming hydrothermal fluids. Combined with previous studies on this ore deposit, the Bailashui tin deposit is temporally and spatially closely related with granitic magmatism in this area. The hydrothermal fluorites are the product of fluid/rock interactions between granitic magmatic hydrothermal fluid and marine carbonate rocks. The REE and F in the ore-forming fluid were derived from the granites, whereas Sr in the ore-forming fluid came mainly from the granitic magmatic hydrothermal fluid and marine carbonate rocks, although variations in Sr isotopic composition cannot be explained by a simple mixture of these two end-members. Evidence demonstrated that the ore-forming fluids are of crustal-mantle mixing origin, but that the fluids were probably incompletely homogenized and this may be caused by inhomogeneous mixing of the fluids of different sources.
|
| 关 键 词： | 萤石 同位素 锡沉淀 稀有地球元素 |
Characteristics of rare-earth elements (REE), strontium and neodymium isotopes in hydrothermal fluorites from the Bailashui tin deposit in the Furong ore field,southern Hunan Province,China |
| |
| YUAN Shunda,;PENG Jiantang,;HU Ruizhong,;BI Xianwu,;QI Liang,;LI Zhaoli,;LI Xiaomin,;SHUANG Yan.Characteristics of rare-earth elements (REE), strontium and neodymium isotopes in hydrothermal fluorites from the Bailashui tin deposit in the Furong ore field,southern Hunan Province,China[J].Chinese Journal of Geochemistry,2008,27(4):342-350. |
| |
| Authors: | Shunda Yuan Jiantang Peng Ruizhong Hu Xianwu Bi Liang Qi Zhaoli Li Xiaomin Li Yan Shuang |
| |
| Institution: | [1]State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Cruiyang 550002, China [2]Graduate School, Chinese Academy of Sciences, Beijing 100049, China [3]Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
| |
| Abstract: | In this paper the authors present the REE concentrations and Sr and Nd isotopic compositions of fluorites from the Bailashui tin deposit of the Furong ore field, southern Hunan Province. The results showed that the total amount of REE in fluorites is usually low, ranging from 0.705 to 8.785 μg/g with the chondrite-normalized REE distribution patterns similar to those of the Qitianling granites in the study area, characterized by LREE-enrichment patterns with pronounced negative Eu anomalies. The fluorites vary in Sr isotopic composition within the range of 0.7083-0.7091, the values are lower than those of the granites and higher than those of the host carbonate rocks in this area. The εNd(t) values of fluorites vary between -9.4 and +10.3, revealing that both the crust- and mantle-source materials were involved in the ore-forming hydrothermal fluids. Combined with previous studies on this ore deposit, the Bailashui tin deposit is temporally and spatially closely related with granitic magmatism in this area. The hydrothermal fluorites are the product of fluid/rock interactions between granitic magmatic hydrothermal fluid and marine carbonate rocks. The REE and F in the ore-forming fluid were derived from the granites, whereas Sr in the ore-forming fluid came mainly from the granitic magmatic hydrothermal fluid and marine carbonate rocks, although variations in Sr isotopic composition cannot be explained by a simple mixture of these two end-members. Evidence demonstrated that the ore-forming fluids are of crustal-mantle mixing origin, but that the fluids were probably incompletely homogenized and this may be caused by inhomogeneous mixing of the fluids of different sources. |
| |
| Keywords: | Bailashui tin deposit fluorite REE Sr and Nd isotopes |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
|
