Genetic discussion between the Triassic plutons and rare metal pegmatite in the Muji area from north section of the Western Kunlun, China.
文献类型：期刊论文
| 作者 | Zhu MingTian1,2; Dong ZhiGuo1,2; Zhang LianChang1,2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2022-07-01 |
| 卷号 | 38期号:7页码:2003-2016 |
| 关键词 | P anomaly Volatile accumulation Rare metal pegmatite Triassic pluton Western Kunlun orogenic belt |
| ISSN号 | 1000-0569 |
| 英文摘要 | The recently discovered Western Kunlun-Songpan-Ganze rare metal belt stretches thousands of kilometers and extends to the westernmost part of China to the Muji area in Western Kunlun. It is closely related to the Triassic highly differentiated granites. In this paper, we focus on four types of Triassic granites, including quartz diorite, monzogranite, granodiorite and muscovite granite, and study their chronology, geochemistry and Sr-Nd-Hf isotopes, in order to discuss their genesis and their relationship with the mineralization of rare metal pegmatite. The geochronology studies show that their emplacement ages are similar between 214Ma and 220Ma. Therein, the muscovite granites are different from other plutons in geochemical and isotopic characteristics. The muscovite granites are enriched in Rb, K, U, Th, P, Nb, Ta, depleted in Sr, Ba, Zr, Hf, Ti and HREE, with obviously fractionation of LREE and HREE and negative Eu anomaly, belonging to strongly differentiated granite and higher I-S Gamma(t) values (0. 71734 similar to 0. 72044), more negative epsilon(Nd) ( t) ( -8.30 similar to- 7.78) and epsilon(Hf) ( t) values ( -4.96 similar to -0.85). Traditionally, the muscovite granite is considered derived from partial melting of the original crustal material, but a few scholars have proposed a new understanding of the high degree of crystallization differentiation and large-scale mixing of crustal material during allogenetic emplacement. This paper tends to consider that these obvious features of the muscovite granite are attributed to the mixing of surrounding rock and the large-scale dissolution and migration of pegmatite fluid. Combined with the enrichment of volatile elements (P) and alkali metal elements ( Li, Be), this paper considers that the large amount of the dissolved, accumulation and migration of volatile from the muscovite granite melt might change the physical and chemical characteristics of the residual melt, such as selected migration of K-Na-Ca breaking the isotopic balance, resulting in the distortion to mirror the origin of protolith. Volatile dissolution, accumulation and migration would not only extract Li and Be from the melt, but also facilitate the migration of rare metal pegmatite fluid, thus, long-distance migrating along the faults to the surrounding rock for rare metal mineralization. Therefore, volatile accumulation may be one of the dominating controlling factors of rare metal super-enrichment, and P anomaly may be an effective evaluation criterion. |
| WOS关键词 | GRANITIC PEGMATITES ; DISCRIMINATION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000878167100011 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/107721]  |
| 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 | Zhu MingTian |
| 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, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu MingTian,Dong ZhiGuo,Zhang LianChang. Genetic discussion between the Triassic plutons and rare metal pegmatite in the Muji area from north section of the Western Kunlun, China.[J]. ACTA PETROLOGICA SINICA,2022,38(7):2003-2016. |
| APA | Zhu MingTian,Dong ZhiGuo,&Zhang LianChang.(2022).Genetic discussion between the Triassic plutons and rare metal pegmatite in the Muji area from north section of the Western Kunlun, China..ACTA PETROLOGICA SINICA,38(7),2003-2016. |
| MLA | Zhu MingTian,et al."Genetic discussion between the Triassic plutons and rare metal pegmatite in the Muji area from north section of the Western Kunlun, China.".ACTA PETROLOGICA SINICA 38.7(2022):2003-2016. |
入库方式： OAI收割
来源：地质与地球物理研究所
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