Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
| Yin, Rong1,2; Sun, Xiao-Ming1,2,3; Wang, Sheng-Wei4; Wang, Ru-Cheng5; Ran, Meng-Lan2,3; Wu, Bin6; Huang, Xiao-Long7,8 | |
| Zircons in NYF-type pegmatites in the Emeishan large igneous province, SW China: A record of Nb and REE mineralization processes | |
| Source Publication | ORE GEOLOGY REVIEWS
 |
| ISSN | 0169-1368 |
| 2023-11-01 | |
| Volume | 162Pages:15 |
| DOI | 10.1016/j.oregeorev.2023.105700 |
| Language | 英语 |
| WOS Research Area | Geology ; Mineralogy ; Mining & Mineral Processing |
| Abstract | 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. |
| Keyword | NFY-pegmatite Zircon Nb-REE mineralization Magmatic-hydrothermal evolution Mantle plume |
| WOS ID | WOS:001149564300001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/76174 |
| Collection | 同位素地球化学国家重点实验室 |
| Corresponding Author | Sun, Xiao-Ming; Huang, Xiao-Long |
| Affiliation | 1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou 510275, Peoples R China 2.Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou 510275, Peoples R China 3.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Peoples R China 4.China Geol Survey, Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China 5.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China 6.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Peoples R China 7.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 8.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| Recommended Citation 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. |
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