Magmatic-hydrothermal evolution of the Koktokay No. 3 pegmatite, Altai, northwestern China: Constraints from in situ boron isotope and chemical compositions of tourmaline
文献类型：期刊论文
| 作者 | Yin, Rong2,3,4; Huang, Xiao-Long3; Wang, Ru-Cheng1; Wei, Gang-Jian3; Xu, Yi-Gang3; Wang, Yu3; Sun, Xiao-Ming2,4,5; Zhang, Le3; Xia, Xiao-Ping3 |
| 刊名 | LITHOS
 |
| 出版日期 | 2023-12-15 |
| 卷号 | 462页码:17 |
| 关键词 | Tourmaline Boron isotopes Fractional crystallization Hydrothermal fluid Rare-metal mineralization LCT-type pegmatite |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107398 |
| 英文摘要 | Lithium-Cs-Ta-enriched (LCT-type) pegmatites are characterized by zoning texture and extreme enrichment of rare-metals. The role of fluids in zonation development and rare-metal mineralization remains a topic of debate. The Koktokay No. 3 pegmatite in northwestern China represents a typical LCT-type pegmatite characterized by economically significant Li-Be-Nb-Ta-Cs mineralization. This pegmatite exhibits a complete evolutionary sequence from outer to inner zones, with diverse rare-metal mineralization. Tourmaline is ubiquitously present in all textural zones of LCT-type pegmatites. In the Koktokay No. 3 pegmatite, the tourmalines exhibit a range of compositions from dravite and schorl to elbaite and rossmanite. The tourmalines in this pegmatite are charac-terized by significantly enriched light B isotope compositions (delta 11B = - 14.8%o to -8.1%o), similar to those typically observed in most pegmatites derived from continental crust sources. The tourmalines in the outer zones have less variable delta 11B values (-13.8%o to -11.5%o) and are interpreted to have crystallized in a viscous magma. The tourmalines in the inner zones exhibit larger variations in delta 11B values (-14.8%o to -8.1%o) than those from the outer zones. The decreasing delta 11B values of tourmalines from the outer to inner zones are attributed to the separation of an immiscible fluid phase that preferentially incorporated heavy B isotopes. The occurrence of hydrothermal tourmaline as veinlets indicates the exsolution of fluids in inner zones, with high delta 11B values ranging from -10.2%o to -9.3%o. Therefore, the hydrothermal fluid can be saturated when the magma has been strongly evolved. In addition to fractional crystallization, exsolved fluids play a significant role in the formation of internal zones and rare-metal mineralization in LCT-type pegmatites. The rare-metals are gradually enriched through fractional crystallization of magma, and the fluid contains mobile elements such as Cs that facilitate precipitation of rare-metal minerals. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001108283300001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/79014]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Huang, Xiao-Long; Sun, Xiao-Ming |
| 作者单位 | 1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China 2.Guangdong Prov Key Lab Marine Resources & Coastal, Guangzhou 510006, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 4.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou 510275, Peoples R China 5.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yin, Rong,Huang, Xiao-Long,Wang, Ru-Cheng,et al. Magmatic-hydrothermal evolution of the Koktokay No. 3 pegmatite, Altai, northwestern China: Constraints from in situ boron isotope and chemical compositions of tourmaline[J]. LITHOS,2023,462:17. |
| APA | Yin, Rong.,Huang, Xiao-Long.,Wang, Ru-Cheng.,Wei, Gang-Jian.,Xu, Yi-Gang.,...&Xia, Xiao-Ping.(2023).Magmatic-hydrothermal evolution of the Koktokay No. 3 pegmatite, Altai, northwestern China: Constraints from in situ boron isotope and chemical compositions of tourmaline.LITHOS,462,17. |
| MLA | Yin, Rong,et al."Magmatic-hydrothermal evolution of the Koktokay No. 3 pegmatite, Altai, northwestern China: Constraints from in situ boron isotope and chemical compositions of tourmaline".LITHOS 462(2023):17. |
入库方式： OAI收割
来源：广州地球化学研究所
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