Mineralogy of the Koktokay No. 3 pegmatite, Altai, NW China: implications for evolution and melt fluid processes of rare-metal pegmatites
文献类型：期刊论文
| 作者 | Zhou, Qifeng1; Qin, Kezhang1; Tang, Dongmei1; Wang, Chunlong1,2,3; Tian, Ye1; Sakyi, Patrick Asamoah4 |
| 刊名 | EUROPEAN JOURNAL OF MINERALOGY
 |
| 出版日期 | 2015-05-01 |
| 卷号 | 27期号:3页码:433-457 |
| 关键词 | garnet tourmaline beryl EMPA LA-ICP-MS fractional crystallisation melt-fluid process Koktokay No. 3 pegmatite Altai |
| DOI | 10.1127/ejm/2015/0027-2443 |
| 文献子类 | Article |
| 英文摘要 | The Koktokay No. 3 pegmatite is the largest Li-Be-Nb-Ta-Cs pegmatitic rare-metal deposit of the Chinese Altai orogenic belt, and is famous for its concentric ring zonation pattern (nine internal zones) and rare-metal reserves. In this paper, we present the results of major and trace element analysis for garnet, tourmaline, and beryl from the outer to inner zones of the No. 3 pegmatite. From previous studies on tourmaline and beryl, potential tracers of the degree of pegmatite evolution could be found by comparing with accepted indicators and evolutionary trends from the outer to inner zones of this pegmatite. The Sc, Y, Li, Ta contents and Y/Ho value of garnet, together with the Ti, Ca, Na, Pb, Bi and REE contents of tourmaline, and the Fe, Ga and Rb concentrations of beryl could be possible tracers of the degree of evolution of pegmatites. The textures and internal structures (homogeneity, oscillatory pattern, heterogeneous rims, replacement structures) of minerals in the pegmatite suggest that the rock underwent (1) rapid undercooling and crystallization after emplacement, resulting in the formation of an unidirectional solidification texture (UST), and then (2) became relatively stable, forming coarse crystals in outer zones, and finally (3) experienced disequilibrium crystallization, leading to the formation of complex internal structures of minerals in the inner zones, mainly caused by exsolution of more fluid and the formation of immiscible melts with different alkali contents. The evolutionary trend and the internal structures of tourmaline and beryl indicate that the formation of the Koktokay No. 3 pegmatite was controlled mainly by fractional crystallization. The convex tetrad effect, nonCHARAC Y/Ho values, and extreme Eu depletion of garnet suggest that immiscibility, which is a significant mechanism during the formation of the No. 3 pegmatite, occurred during emplacement. The differences in composition and internal structures of the minerals between the outer and inner zones of the No. 3 pegmatite suggest that there was an abrupt change, during transition from the melt stage to the melt fluid stage, resulting from a decompression event, which led to the exsolution of the fluid and initiated the Li-Ta-Cs deposition in the pegmatite. |
| WOS关键词 | ELEMENT GRANITIC PEGMATITES ; LA-ICP-MS ; SOUTH MOUNTAIN BATHOLITH ; LATE RE-EQUILIBRATION ; PIKES-PEAK BATHOLITH ; NORTHWESTERN CHINA ; GEOCHEMICAL EVOLUTION ; HYDROTHERMAL FLUIDS ; TRACE-ELEMENTS ; U-PB |
| WOS研究方向 | Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000357553500016 |
| 资助机构 | Ministry of Land and Resources Comprehensive Research for Typical Mineral Deposits(20089932) ; Ministry of Land and Resources Comprehensive Research for Typical Mineral Deposits(20089932) ; Key projects in National Science and Technology Pillar Program(2011BAB06B03) ; Key projects in National Science and Technology Pillar Program(2011BAB06B03) ; Ministry of Land and Resources Comprehensive Research for Typical Mineral Deposits(20089932) ; Ministry of Land and Resources Comprehensive Research for Typical Mineral Deposits(20089932) ; Key projects in National Science and Technology Pillar Program(2011BAB06B03) ; Key projects in National Science and Technology Pillar Program(2011BAB06B03) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62317]  |
| 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 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resource, Urumqi 830011, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Univ Ghana, Dept Earth Sci, Legon, Ghana |
| 推荐引用方式 GB/T 7714 | Zhou, Qifeng,Qin, Kezhang,Tang, Dongmei,et al. Mineralogy of the Koktokay No. 3 pegmatite, Altai, NW China: implications for evolution and melt fluid processes of rare-metal pegmatites[J]. EUROPEAN JOURNAL OF MINERALOGY,2015,27(3):433-457. |
| APA | Zhou, Qifeng,Qin, Kezhang,Tang, Dongmei,Wang, Chunlong,Tian, Ye,&Sakyi, Patrick Asamoah.(2015).Mineralogy of the Koktokay No. 3 pegmatite, Altai, NW China: implications for evolution and melt fluid processes of rare-metal pegmatites.EUROPEAN JOURNAL OF MINERALOGY,27(3),433-457. |
| MLA | Zhou, Qifeng,et al."Mineralogy of the Koktokay No. 3 pegmatite, Altai, NW China: implications for evolution and melt fluid processes of rare-metal pegmatites".EUROPEAN JOURNAL OF MINERALOGY 27.3(2015):433-457. |
入库方式： OAI收割
来源：地质与地球物理研究所
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