Magmatic-hydrothermal evolution and Nb-Ta mineralization process of the Kelumute No. 112 albite-spodumene pegmatite, Altai, Xinjiang: Insights from mica compositional variation
文献类型：期刊论文
| 作者 | Luo YaoQing1,6; Feng HaoXuan1,5; Shen Ping1,5,6; Menuge, Julian Francis3,4; Bai YingXiong1,6; Cao Chong1,2; Wu Yang1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 39期号:11页码:3369-3391 |
| ISSN号 | 1000-0569 |
| 关键词 | Magmatic-hydrothermal evolution Nb-Ta mineralization Albite-spodumene pegmatite Kelumute Altai |
| 英文摘要 | The timing of fluid exsolution and the processes that control the niobium -tantalum mineralization during the magmatichydrothermal evolution of a pegmatite are still not well understood. This paper focuses on the Kelumute No. 112 albite-spodumene pegmatite, Altai orogen, Xinjiang, NW China, to address the above scientific issues. Based on field observation and petrographic study, we present new constraints on the No. 112 pegmatite evolution and related Nb-Ta mineralization process from a perspective of mica texture and major element composition. Five textual units are developed in the No. 112 pegmatite: albitized microcline-quartz zone ( I), muscovite-quartz-albite assemblage ( II), albitized blocky microcline zone ( III), quartz-albite-spodumene zone ( IV), and saccharoidal albite assemblage ( V). It is weakly zoned: I and II mostly occur at the border or wall of the pegmatite, they can be viewed as the poorly mineralized " shell"; III represents poorly mineralized upper intermediate zone that contains abundant mega -crystal microcline; IV is lower intermediate zone that contains abundant mega -crystal spodumene; V represents the residual of the pegmatitic melt that contains abundant columbite-group minerals ( CGM). Three types of mica were identified: Type A, primary compositionally homogeneous muscovite; Type B, primary but altered by fluid, compositionally heterogeneous muscovite ( showing bright and dark zoning in BSE images); and Type C, secondary compositionally homogeneous muscovite. A three -stage model for the magma evolution of the pegmatite is suggested as follows: (1) Stage I, early fluid exsolution from the pegmatitic magma and fluid -country rock ( two- mica granite) interaction took place, which resulted in the greisenization of the country rock, and some iron was also released to the pegmatitic magma through the breakdown of biotite from the country rock (contamination) at the same time. (2) Stage II, represented by an internal fractional crystallization process of the melt that was followed by albitization. During this stage, part of Type A muscovite and the bright domain of Type B muscovite in wall zone ( I) have the highest FeOT contents (5. 20% - 5. 73%) over the whole pegmatite vein, resulting from Fe -contamination by the country rock during the greisenization process. Besides, from zone I to assemblage V, the Type A and the bright domain of Type B muscovite had formed a continuous trend characterized by decreasing FeOT and MgO contents due to fractional crystallization. (3) Stage III, a second fluid exsolution event took place in this stage. Fluid -crystal interaction caused the release of Fe, Mg and F from Type B muscovite, thus forming light and dark compositional zoning. Also, primary minerals were replaced by secondary Type C muscovite that has lower FeOT, MgO and F contents. Finally, we proposed three viewpoints: the Fe contamination by the country rock during Stage I provided a source of Fe for the precipitation of CGM; the consumption of F by fractional crystallization of apatite during Stage II made a contribution to CGM precipitation; and crystal -fluid interaction during Stage III resulted in the release of Fe or Mn from crystallized minerals, the following interaction between Fe- or Mnbearing fluid and Nb- or Ta-rich melt led to CGM precipitation. |
| WOS关键词 | TANTALUM |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:001097943000010 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/111145]  |
| 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 | Luo YaoQing |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.North China Univ Sci & Technol, Coll Min Engn, Tangshan 063210, Peoples R China 3.Univ Coll Dublin, Sch Earth Sci, Dublin D04 N2E5, Ireland 4.Irish Ctr Res Appl Geosci, Dublin D04 N2E5, Ireland 5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo YaoQing,Feng HaoXuan,Shen Ping,et al. Magmatic-hydrothermal evolution and Nb-Ta mineralization process of the Kelumute No. 112 albite-spodumene pegmatite, Altai, Xinjiang: Insights from mica compositional variation[J]. ACTA PETROLOGICA SINICA,2023,39(11):3369-3391. |
| APA | Luo YaoQing.,Feng HaoXuan.,Shen Ping.,Menuge, Julian Francis.,Bai YingXiong.,...&Wu Yang.(2023).Magmatic-hydrothermal evolution and Nb-Ta mineralization process of the Kelumute No. 112 albite-spodumene pegmatite, Altai, Xinjiang: Insights from mica compositional variation.ACTA PETROLOGICA SINICA,39(11),3369-3391. |
| MLA | Luo YaoQing,et al."Magmatic-hydrothermal evolution and Nb-Ta mineralization process of the Kelumute No. 112 albite-spodumene pegmatite, Altai, Xinjiang: Insights from mica compositional variation".ACTA PETROLOGICA SINICA 39.11(2023):3369-3391. |
入库方式： OAI收割
来源：地质与地球物理研究所
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