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Geological, Mineralogical and Geochemical Study of the Aquamarine-Bearing Yamrang Pegmatite, Eastern Nepal with Implications for Exploration Targeting

文献类型：期刊论文

作者Bhandari, Sushmita2,3,5; Qin, Kezhang3,5; Zhou, Qifeng1; Evans, Noreen J.4
刊名MINERALS
出版日期2022-05-01
卷号12期号:5页码:30
关键词Yamrang Pegmatite mineral chemistry of alkali feldspar and muscovite beryl saturation process Be partition sequence Eastern Nepal Himalaya
DOI10.3390/min12050564
英文摘要The Yamrang Pegmatite in the Ikhabu Pegmatite Field, Eastern Nepal is Nepal's primary source of aquamarine. This paper reports detailed mineralogy and whole rock granite and pegmatite geochemistry, and major and trace element data for alkali feldspar and muscovite in order to classify the aquamarine-bearing Yamrang Pegmatite, elucidate beryl-saturation processes and evaluate potential geochemical exploration tools for beryl-pegmatites. Five internal mineralogical/textural zones were identified in the Yamrang Pegmatite; zone 1 (saccharoidal albite); zone 2 (blocky perthitic microcline); zone 3 (muscovite-microcline-quartz); zone 4 (beryl-quartz), and zone 5 (miarolitic cavities). Zones 1-4 represent the magmatic stage, while zone 5 formed during the hydrothermal stage of pegmatite genesis. Spectacular aquamarines are recovered from miarolitic zone 5, while beryl saturation is found in zones 3, 4, and 5. Based on beryllium (Be) content, Be partition among co-existing minerals at the magmatic stage is beryl > muscovite > tourmaline > alkali feldspar > quartz. In contrast, the sequence at the hydrothermal stage is beryl > muscovite > albite > tourmaline > quartz. The Be content in rock-forming minerals decreases from pegmatite margin to core, and tourmaline could have played a significant role in Be enrichment processes in the marginal pegmatite zone. High temperature, a low degree of fractionation, and the dominance of Be-compatible mineral phases such as muscovite, calcium-rich alkali feldspar and tourmaline resulted in beryl undersaturation in marginal zones. However, low temperature, high fractional crystallization, and low abundance of Be-compatible mineral phases resulted in beryl saturation in inner zones. The strongly peraluminous nature, low total REE content (<500 ppm), mineral assemblage of beryl, tourmaline, spessartine, columbite-tantalite, depletion of Ba, Nb, and enrichment of Pb, Rb, Cs in the primitive mantle normalized multi-element plots suggest that the beryl-bearing Yamrang Pegmatite corresponds to the LCT pegmatite family. Alkali feldspar with K/Rb values of 30-150, Rb similar to 3000 ppm, Cs >100 ppm, and muscovite, with K/Rb ranging 18-50, Rb similar to 6000 ppm, Cs > 500 ppm, and Ta > 65 ppm in inner zones (3-5), indicate that the Yamrang Pegmatite is an intermediate-fractionated, beryl-type rare-element (REL) pegmatite. It is probable that whole rock Be content of >10 ppm could be considered an exploration guide to beryl mineralization in the region.
WOS关键词ELEMENT GRANITIC PEGMATITES ; CHANNEL FLOW ; COMPOSITIONAL EVOLUTION ; TETHYAN HIMALAYA ; U-PB ; MICAS ; CLASSIFICATION ; LEUKOGRANITE ; CONSTRAINTS ; BERYLLIUM
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Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
语种英语
WOS记录号WOS:000804275300001
出版者MDPI
资助机构CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; Key Deployment Project of CAS ; Key Deployment Project of CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/106015]  
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.China Met Geol Bur, Inst Mineral Resources Res, Beijing 101300, Peoples R China
2.Govt Nepal, Dept Mines & Geol, Minist Ind Commerce & Supplies, Kathmandu 44600, Nepal
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.Curtin Univ, John de Laeter Ctr, Sch Earth & Planetary Sci, Perth, WA 6845, Australia
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Bhandari, Sushmita,Qin, Kezhang,Zhou, Qifeng,et al. Geological, Mineralogical and Geochemical Study of the Aquamarine-Bearing Yamrang Pegmatite, Eastern Nepal with Implications for Exploration Targeting[J]. MINERALS,2022,12(5):30.
APA Bhandari, Sushmita,Qin, Kezhang,Zhou, Qifeng,&Evans, Noreen J..(2022).Geological, Mineralogical and Geochemical Study of the Aquamarine-Bearing Yamrang Pegmatite, Eastern Nepal with Implications for Exploration Targeting.MINERALS,12(5),30.
MLA Bhandari, Sushmita,et al."Geological, Mineralogical and Geochemical Study of the Aquamarine-Bearing Yamrang Pegmatite, Eastern Nepal with Implications for Exploration Targeting".MINERALS 12.5(2022):30.

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来源：地质与地球物理研究所

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