Chemical and boron isotopic compositions of tourmaline from the pegmatite in Ke'eryin rare metal orefield, Eastern Tibet: Implications for pegmatitic evolution
文献类型：期刊论文
| 作者 | Yu, Deshui2,3,4; Yan, Haibo1,7,8; Wang, Shoujing2,3,4; Xu, Deru6; Wang, Zhilin5; Ma, Chi2,3,4; Wei, Fushuai2,3,4 |
| 刊名 | JOURNAL OF GEOCHEMICAL EXPLORATION
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| 出版日期 | 2024-07-01 |
| 卷号 | 262页码:18 |
| 关键词 | Pegmatite Tourmaline Boron isotope Mineral chemistry Ke'eryin |
| ISSN号 | 0375-6742 |
| DOI | 10.1016/j.gexplo.2024.107475 |
| 英文摘要 | Pegmatites occur widely in the Ke'eryin rare metal orefield. The genesis and evolution of the Ke'eryin pegmatites are still in dispute, and morphological and geochemical studies on tourmalines from the Ke'eryin pegmatites are limited. In this study, in-situ analyses of major and trace elements and B isotope were conducted to uncover the origin of tourmaline and the evolution of related pegmatites. Three types of tourmaline from the Ke'eryin barren pegmatite were identified: elongated columnar or needle-columnar tourmaline (Tur-1 type), isolated, disseminated, irregular, and massive tourmaline (Tur-2 type), and long columnar tourmaline (Tur-3 type). Petrographically, the Tur-1 type crystallized at the early stage of pegmatitic crystallization sequence, the Tur-2 type possibly formed at the early- and/or syn-pegmatitic crystallization sequence, whereas the Tur-3 type likely formed at the relatively late crystallization sequence. Compositionally, most tourmalines belong to the alkali group with a few falling in the vacancy group. All the tourmalines show a schorl composition and are of magmatic origin. Chemical variations from the Tur-1 to Tur-3 tourmalines are controlled by magma fractionation and melt compositions rather than crystal chemical effects. Most tourmalines follow the (Na, Mg)(Xvac, Al)_1, (Mg, OH)(Al, O)_ 1, and (Ca, Mg2)(Xvac, Al2)_ 1 exchange vectors. The higher contents of Zn, Sn, Li, Be, Nb, and Ta and negative Eu anomalies in the Tur-3 type indicate that it was likely crystallized at a more evolved stage. In combination with textural evidence and tourmaline chemistry, we suggest that the Tur-1 and Tur-2 types were formed at the relatively earlier stage of pegmatite-forming magma and the Tur-3 type was likely formed closer to the end-stage of barren pegmatite crystallization. The B isotopic compositions are relatively homogeneous and display slightly higher in the Tur-3 type, which were likely caused by fractional crystallization during B-rich magma evolution. It can be inferred that the tourmaline in more evolved and/or Li-mineralized pegmatite with magma evolution should have higher Li, Be, Nb, Ta, and Sn contents, implying that tourmaline chemistry may be used as a potential exploration indicator for rare metal mineralization. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001235506900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78510]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Yan, Haibo; Wang, Shoujing |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.Minist Nat Resources, Key Lab Polymet OresEvaluat & Utilizat, Zhengzhou 450006, Peoples R China 3.China Natl Engn Res Ctr Utilizat Ind Minerals, Zhengzhou 450006, Peoples R China 4.CAGS, Zhengzhou Inst Multipurpose Utilizat Mineral Resou, Zhengzhou 450006, Peoples R China 5.Cent South Univ, Sch Geosci & Info Phys, Changsha 410083, Peoples R China 6.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Peoples R China 7.Fuzhou Univ, Zijin Sch Geol & Min, Fuzhou 350108, Peoples R China 8.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Deshui,Yan, Haibo,Wang, Shoujing,et al. Chemical and boron isotopic compositions of tourmaline from the pegmatite in Ke'eryin rare metal orefield, Eastern Tibet: Implications for pegmatitic evolution[J]. JOURNAL OF GEOCHEMICAL EXPLORATION,2024,262:18. |
| APA | Yu, Deshui.,Yan, Haibo.,Wang, Shoujing.,Xu, Deru.,Wang, Zhilin.,...&Wei, Fushuai.(2024).Chemical and boron isotopic compositions of tourmaline from the pegmatite in Ke'eryin rare metal orefield, Eastern Tibet: Implications for pegmatitic evolution.JOURNAL OF GEOCHEMICAL EXPLORATION,262,18. |
| MLA | Yu, Deshui,et al."Chemical and boron isotopic compositions of tourmaline from the pegmatite in Ke'eryin rare metal orefield, Eastern Tibet: Implications for pegmatitic evolution".JOURNAL OF GEOCHEMICAL EXPLORATION 262(2024):18. |
入库方式： OAI收割
来源：广州地球化学研究所
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