Zircons in NYF-type pegmatites in the Emeishan large igneous province, SW China: A record of Nb and REE mineralization processes
文献类型：期刊论文
| 作者 | Yin, Rong3,4; Sun, Xiao-Ming3,4,7; Wang, Sheng-Wei5; Wang, Ru-Cheng6; Ran, Meng-Lan4,7; Wu, Bin2; Huang, Xiao-Long1,8 |
| 刊名 | ORE GEOLOGY REVIEWS
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 162页码:15 |
| 关键词 | NFY-pegmatite Zircon Nb-REE mineralization Magmatic-hydrothermal evolution Mantle plume |
| ISSN号 | 0169-1368 |
| DOI | 10.1016/j.oregeorev.2023.105700 |
| 英文摘要 | The metallogenic mechanism of Nb and rare earth elements (REEs) during the magmatic-hydrothermal evolution of alkaline rocks remains ambiguous. Zircon is a common accessory mineral occurring in both barren aplite and the Nb-Y-F mineralized pegmatite (NFY-type) in Miyi County of the Pan-Xi area, the central zone of the Permian Emeishan large igneous province (ELIP) in SW China. Here, we present in situ geochemical analyses on these zircons to reveal the Nb-REE mineralization processes during magmatic-hydrothermal evolution, as well as the prospecting potential of plume-related NYF-type pegmatites. Four types of zircons are identified in the Miyi aplite and pegmatite. Zrn-I with well-developed oscillatory zoning (OZ) represents magmatic zircons in the aplite. Zrn-II and Zrn-III are magmatic zircons in the pegmatite. Zrn-II is closely associated with albite and is restricted to the center of an individual crystal, indicating early crystallization. There are abundant nanoscale britholite and thorite inclusions in Zrn-II, indicating that the primary melt is enriched in Ca, Y, REEs, Nb, Th, and F. Zrn-III presents as the rim of Zrn-II, with a sharp boundary between them. Zrn-IV is a metamict zircon formed through hydrothermal alteration after its structure was destroyed due to high Th and/or U contents. In situ zircon U-Pb dating of both Zrn-I and Zrn-III yields concordant ages of ca. 258 Ma, coeval with the felsic magmatism in the ELIP. For positive epsilon Hf(t) values of Zrn-I and Zrn-III (1.8-5.8 and 1.5-9.1, respectively), the Miyi pegmatite is also plume-related and might be derived from magma resembling A-type granite in the ELIP. Both Zrn-I and ZrnIII show negative Eu anomalies, and there is a decrease in Sc contents from Zrn-I to Zrn-III, indicating that the Miyi pegmatite formed from a highly evolved magma. Furthermore, the synchronous increases in Na, Nb, Y and total REEs from Zrn-I to Zrn-III indicate that excess Na in the melt plays an essential role in the further enrichment of Nb, Y, and REEs. In addition, a dramatic decrease in Nb, Y and total REE contents and LREE (light REE)/HREE (heavy REE) ratios from Zrn-III to Zrn-IV illustrates that Na- and F-rich hydrothermal fluids can leach and facilitate the precipitation of these elements, particularly LREEs. Therefore, there are two-stage Nb and REE mineralization processes related to magmatic-hydrothermal evolution in the Miyi pegmatite, which may be a general model for the mineralization of plume-related NFY-type pegmatites. |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:001149564300001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/76173]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Sun, Xiao-Ming; Huang, Xiao-Long |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Peoples R China 3.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou 510275, Peoples R China 4.Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou 510275, Peoples R China 5.China Geol Survey, Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China 6.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China 7.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Peoples R China 8.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yin, Rong,Sun, Xiao-Ming,Wang, Sheng-Wei,et al. Zircons in NYF-type pegmatites in the Emeishan large igneous province, SW China: A record of Nb and REE mineralization processes[J]. ORE GEOLOGY REVIEWS,2023,162:15. |
| APA | Yin, Rong.,Sun, Xiao-Ming.,Wang, Sheng-Wei.,Wang, Ru-Cheng.,Ran, Meng-Lan.,...&Huang, Xiao-Long.(2023).Zircons in NYF-type pegmatites in the Emeishan large igneous province, SW China: A record of Nb and REE mineralization processes.ORE GEOLOGY REVIEWS,162,15. |
| MLA | Yin, Rong,et al."Zircons in NYF-type pegmatites in the Emeishan large igneous province, SW China: A record of Nb and REE mineralization processes".ORE GEOLOGY REVIEWS 162(2023):15. |
入库方式： OAI收割
来源：广州地球化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。