Hydrothermal alteration and mineral chemistry of the giant Baiyanghe Be-U deposit in Xinjiang, northwest China: Implications for its mineralization
文献类型：期刊论文
| 作者 | Zhang, Long1,2,3; Li, Xiaofeng1,2,3; Wang, Guo4; Wang, Mou4; Yang, Wenlong4; Zhang, Lei4; Zhu, Yiting1,2,3 |
| 刊名 | ORE GEOLOGY REVIEWS
 |
| 出版日期 | 2019-08-01 |
| 卷号 | 111页码:18 |
| 关键词 | Hydrothermal alteration Mineral chemistry Precipitation mechanisms Be-U mineralization Baiyanghe deposit |
| ISSN号 | 0169-1368 |
| DOI | 10.1016/j.oregeorev.2019.102972 |
| 英文摘要 | The Baiyanghe Be-U deposit is located in the Xuemisitan volcanic belt of the northwest margin of the Junggar plate, NW China. It is the largest beryllium deposit in Asia, but the physicochemical conditions of ore precipitation and mechanisms of transportation and precipitation of Be and U are still poorly constrained. Here we present detailed petrographic study, whole-rock major and trace elements of the host rocks, and mineral chemistry of this deposit to address these issues. The alteration minerals associated with Be-U mineralization mainly include fluorite, hematite, quartz, chlorite, manganese oxides, and muscovite. Fluorite is generally colorless, green, or light purple to dark purple in this deposit. The colorless and green fluorite and calcite display low concentrations of Be and U. The light purple to purple fluorite is characterized by high Be concentration but low U concentration. The dark purple fluorite shows high concentrations of Be and U. Both primary mica in the Yangzhuang granite porphyry and hydrothermal muscovite in the ore are enriched in F (4.26-7.78 wt%, 4.22-6.70 wt% respectively). These results indicate that the ore-forming fluids were enriched in F, and this deposit might have experienced at least two hydrothermal events that are responsible for the precipitation of Be and U minerals. All investigated chlorites are trioctahedral and belong to Fe-chlorites, and they precipitated at temperatures of 125-200 degrees C. Thermochemical constraints suggest that the ore-forming fluids had logfO(2) about - 25 to - 30 and pH about 4.5-5.2. Our study indicates that the Yangzhuang granite porphyry may represent the primary sources of Be and U, and that post-magmatic hydrothermal processes accompanied with extensive hydrothermal alteration caused remobilization of Be, U, and other elements from the granite porphyry. Both Be and U were mainly transported as fluoride complex ions, as indicated by the abundant fluorite and other Fbearing gangue minerals. The contact zones between the granite porphyry and Devonian volcanic rocks provide favorable reservoirs for Be and U minerals. The precipitation of Be was mainly resulted from the decreasing temperature and fluorine concentration in fluids, and the decreasing fO(2) and increasing pH were responsible for the precipitation of U. |
| WOS关键词 | CENTRAL-IBERIAN ZONE ; CHEMICAL-COMPOSITION ; WEST JUNGGAR ; THERMODYNAMIC PROPERTIES ; ZHUGUANGSHAN COMPLEX ; CRYSTAL-STRUCTURE ; PHASE-EQUILIBRIA ; GRANITE PORPHYRY ; SOLID-SOLUTION ; MO DEPOSIT |
| 资助项目 | China National Nuclear Corporation[LTD1603] |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:000484869200017 |
| 出版者 | ELSEVIER |
| 资助机构 | China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/93565]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Li, Xiaofeng |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 4.China Natl Nucl Corp, Geol Survey 216, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Long,Li, Xiaofeng,Wang, Guo,et al. Hydrothermal alteration and mineral chemistry of the giant Baiyanghe Be-U deposit in Xinjiang, northwest China: Implications for its mineralization[J]. ORE GEOLOGY REVIEWS,2019,111:18. |
| APA | Zhang, Long.,Li, Xiaofeng.,Wang, Guo.,Wang, Mou.,Yang, Wenlong.,...&Zhu, Yiting.(2019).Hydrothermal alteration and mineral chemistry of the giant Baiyanghe Be-U deposit in Xinjiang, northwest China: Implications for its mineralization.ORE GEOLOGY REVIEWS,111,18. |
| MLA | Zhang, Long,et al."Hydrothermal alteration and mineral chemistry of the giant Baiyanghe Be-U deposit in Xinjiang, northwest China: Implications for its mineralization".ORE GEOLOGY REVIEWS 111(2019):18. |
入库方式： OAI收割
来源：地质与地球物理研究所
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