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Magmatic-hydrothermal evolution of the aquamarine-bearing Yamrang Pegmatite, Eastern Nepal: Insights from beryl, garnet, and tourmaline mineral chemistry

文献类型：期刊论文

作者Bhandari, Sushmita5,6,7; Qin, Kezhang6,7; Zhou, Qifeng4; Evans, Noreen J.2; Gyawali, Babu Ram3; He, Changtong6,7; Sun, Zhenghao1,7
刊名ORE GEOLOGY REVIEWS
出版日期2023-11-01
卷号162页码:24
ISSN号0169-1368
关键词Magmatic-hydrothermal evolution Mineral chemistry Accessory minerals Yamrang pegmatite Eastern Nepal Higher Himalaya
DOI10.1016/j.oregeorev.2023.105713
英文摘要The Ikhabu Pegmatite Field (IPF) in the Nepal Himalaya is a newly discovered rare-element (REL) pegmatite field that hosts the Yamrang pegmatite, the primary source of the famous Nepalese aquamarines. In this contribution, we provide a comprehensive description of the geology of both the IPF and the Yamrang pegmatite, offering insights into the evolutionary stages of the Yamrang pegmatite based on its internal texture and the mineral chemistry of beryl, garnet, and tourmaline. The Yamrang pegmatite is classified as a beryl-columbite subtype of REL pegmatite, exhibiting axial symmetric zonation and is differentiated into five mineralogical-textural zones during magmatic and hydrothermal stages. The magmatic stage involves undercooling, disequilibrium crystallization, and fractional crystallization whereas the hydrothermal stage comprises alkali-enriched fluid exsolution, the formation of miarolitic cavities, and the crystallization of aquamarine. Yamrang aquamarines are enriched in FeO, up to 1.1 wt%, with Fe2+ as the primary chromophore, resulting in their blue color. Two types of beryl have been identified: magmatic beryl in zones 3 and 4 and hydrothermal beryl in miarolitic cavities (zone 5). Magmatic beryls are characterized by their alkali-poor to sodic composition, prismatic to columnar habit, homogeneous texture, and the presence of Fe-Al octahedral substitution. In contrast, hydrothermal beryls belong to the sodic to Li-Cs beryl group, with tabular to acicular habit, weak compositional zoning, and channeltetrahedral substitution. Yamrang garnet belongs to the almandine-spessartine series, while the tourmalines are Mg-Ca rich dravite-schorl to Fe-Mn rich schorl variety. Alkali-poor to Li-Cs beryl with low REE contents, spessartine garnet (spessartine component, Xsps similar to 52) with high HREE, and schorl with high Ti but low Li, Pb, and REE contents suggests that the Yamrang Pegmatite is an intermediate-fractionated REL pegmatite. Potential pegmatite evolution indicators for IPF include high alkali, Fe, Mn, and Rb contents in beryl, high Xsps in garnet, and an increase in Li, Fe, Mn, Zn, Ga, and Nb, alongside depletion of Mg, Ca, Ti, and Ta in schorl. The identification of a rare metal pegmatite field in the Nepalese Himalaya reinforces the general rare metal mineralization potential of the entire Himalaya region.
WOS关键词LATE RE-EQUILIBRATION ; GRANITIC PEGMATITES ; TANCO PEGMATITE ; BERNIC LAKE ; CHINA IMPLICATIONS ; CRYSTAL-CHEMISTRY ; TRACE-ELEMENTS ; LI DEPOSIT ; MANITOBA ; ALTAI
资助项目CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research[2019QZKK0806] ; Key Deployment Project of CAS[ZDRW-ZS-2020-4-1]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
出版者ELSEVIER
WOS记录号WOS:001108564000001
资助机构CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Key Deployment Project of CAS ; Key Deployment Project of CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/111155]  
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Qin, Kezhang
作者单位1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resource, Urumqi 830011, Peoples R China
2.Curtin Univ, John de Laeter Ctr, Perth, WA 6845, Australia
3.Tribhuvan Univ, Dept Geol, Trichandra Campus, Kathmandu 44600, Nepal
4.China Met Geol Bur, Inst Mineral Resources Res, Beijing 101300, Peoples R China
5.Govt Nepal, Dept Mines & Geol, Minist Ind Commerce & Supplies, Kathmandu 44600, Nepal
6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
7.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Bhandari, Sushmita,Qin, Kezhang,Zhou, Qifeng,et al. Magmatic-hydrothermal evolution of the aquamarine-bearing Yamrang Pegmatite, Eastern Nepal: Insights from beryl, garnet, and tourmaline mineral chemistry[J]. ORE GEOLOGY REVIEWS,2023,162:24.
APA Bhandari, Sushmita.,Qin, Kezhang.,Zhou, Qifeng.,Evans, Noreen J..,Gyawali, Babu Ram.,...&Sun, Zhenghao.(2023).Magmatic-hydrothermal evolution of the aquamarine-bearing Yamrang Pegmatite, Eastern Nepal: Insights from beryl, garnet, and tourmaline mineral chemistry.ORE GEOLOGY REVIEWS,162,24.
MLA Bhandari, Sushmita,et al."Magmatic-hydrothermal evolution of the aquamarine-bearing Yamrang Pegmatite, Eastern Nepal: Insights from beryl, garnet, and tourmaline mineral chemistry".ORE GEOLOGY REVIEWS 162(2023):24.

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来源：地质与地球物理研究所

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