Mineralogy and significance of micas and feldspars from the Koktokay No. 3 pegmatitic rare-element deposit, Altai
文献类型：期刊论文
| 作者 | Zhou QiFeng1,2; Qin KeZhang1; Tang DongMei1; Ding JianGang3; Guo ZhengLin4 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-09-01 |
| 卷号 | 29期号:9页码:3004-3022 |
| 关键词 | Pegmatite Mica Feldspar Chemical composition Texture zonation The Koktokay No. 3 pegmatite Altai |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The Koktokay No. 3 pegmatitic rare-element deposit with perfect and world-famous concentric internal zones is the largest pegmatite of the Altai orogen belt, hosting about 100,000 pegmatites. The micas and feldspars show different features of structure and composition in 9 internal zones. The micas belong to muscovite through I-VIII zones and lepidolite in inner zones. From outer to inner, muscovites occur in yellow-green middle to fine grains, white or green middle-coarse-huge grains and white or green book assemblages. Lepidolites occur in middle-fine scaly or wedge-shaped assemblages. There are chemical zoning, disequilibrium and metasomatic structures of micas in backscattered images. The feldspars from the Koktokay No. 3 pegmatite include K-feldspar, albite and some plagioclase. The K-feldspars occur in massive and albites occur in saccharoidal, blade and slice from outer to inner. The micas of the Koktokay No. 3 pegmatite contain high Li(249 x 10(-6) similar to 35932 x 10(-6) Rb(1240 x 10(-6) similar to 22825 x 10(-6) CS (35. 9 x 10-6 similar to 13980 x 10(-6) Ta (13. 3 x 10(-6)-447 x 10(-6)), low K/Rb values (4. 23-59. 4) and 1C/Cs values (6. 53 similar to 2368) and the K-feldspars contain low K/Rb values (35. 4 +/- 1865). Also, from outer to inner, Li, Rb, Cs, F and Ta contents increase and K/Rb values decrease. Thus, the Koktokay No. 3 pegmatite is a highly evolutionary pegmatite with increasing fractionation from outer to inner. The oscillation changes of major and trace element contents of micas and feldspars from continuous adjacent zones are possibly controlled by melt-immiscible process with minor effect of mineral crystallization and fractionation. Also, the melt-immiscible process possibly results in the internal zonation of the Koktoka No. 3 pegmatite. There are significant differences of compositions (FeO, Li, Rb, Cs, F, Ta contents and K/Rb and K/Cs values) and structures(disequilibrium and metasomatic) of micas and feldspars between outer zones (IIV) and inner zones (V-VIII). Compared with outher zones, inner zones show more fractionation features and contain more fluid, suggesting that the system transformed from melt stage(outer zones) to instable melt-fluid stage(inner zones). On account of fieldwork, a pressure-relief event results in the the system abrupt change between zone IV and zone V and contributes to more fluid exoslution and the formation of melt-fluid stage. |
| WOS关键词 | MUSCOVITE-LEPIDOLITE SERIES ; LATE RE-EQUILIBRATION ; PIKES-PEAK BATHOLITH ; ABLATION ICP-MS ; GRANITIC PEGMATITES ; NW CHINA ; NORTHWESTERN CHINA ; TRACE-ELEMENTS ; GEOCHEMICAL EVOLUTION ; TECTONIC EVOLUTION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000326552900004 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/87312]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhou QiFeng |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Xinjiang Geoexplorat Bur Nonferrous Met, Geol Team 701, Changji 831100, Peoples R China 4.Xinjiang Geoexplorat Bur Nonferrous Met, Urumqi 830000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou QiFeng,Qin KeZhang,Tang DongMei,et al. Mineralogy and significance of micas and feldspars from the Koktokay No. 3 pegmatitic rare-element deposit, Altai[J]. ACTA PETROLOGICA SINICA,2013,29(9):3004-3022. |
| APA | Zhou QiFeng,Qin KeZhang,Tang DongMei,Ding JianGang,&Guo ZhengLin.(2013).Mineralogy and significance of micas and feldspars from the Koktokay No. 3 pegmatitic rare-element deposit, Altai.ACTA PETROLOGICA SINICA,29(9),3004-3022. |
| MLA | Zhou QiFeng,et al."Mineralogy and significance of micas and feldspars from the Koktokay No. 3 pegmatitic rare-element deposit, Altai".ACTA PETROLOGICA SINICA 29.9(2013):3004-3022. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。