Crystal Chemistry and Fluid Inclusions of Beryl From the Mufushan Area

CHENHao; LIAn-Bang; ZHAOPeng; XIAXi-Sheng; LIRun-Ze; ZHUMing-Ming; XUHai-Jun

doi:10.3969/j.issn.2097-0013.2022.03.008

2022 Vol. 38, No. 3

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Article navigation > South China Geology > 2022 > 38(3): 459-471

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CHENHao, LIAn-Bang, ZHAOPeng, XIAXi-Sheng, LIRun-Ze, ZHUMing-Ming, XUHai-Jun. 2022. Crystal Chemistry and Fluid Inclusions of Beryl From the Mufushan Area. South China Geology, 38(3): 459-471. doi: 10.3969/j.issn.2097-0013.2022.03.008

Citation:

CHENHao, LIAn-Bang, ZHAOPeng, XIAXi-Sheng, LIRun-Ze, ZHUMing-Ming, XUHai-Jun. 2022. Crystal Chemistry and Fluid Inclusions of Beryl From the Mufushan Area. South China Geology, 38(3): 459-471. doi: 10.3969/j.issn.2097-0013.2022.03.008

Crystal Chemistry and Fluid Inclusions of Beryl From the Mufushan Area

1. Hubei Nuclear Industry Geological Survey, Xiaogan 4320001, Hubei, China
2.School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China

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Corresponding author: XUHai-Jun

Received Date: 29 September 2021

Revised Date: 20 December 2021

Abstract

Abstract

Granitic pegmatite veins are widely distributed in the inner and adjacent region of the Mufushan granitic complex, where beryl is locally concentrated. In this study, centimeter-sized gem beryl crystals were collected from plagioclase-quartz pegmatites from the Duanfengshan, Xiamaiwo and Da’ao areas. The calculated chemical formula based on EPMA data is (Be2.952, Li0.048)Al2.000[Si5.983O18]·0.035H2O, which indicates enriched alkali metals of Be and Li with very low content of Mg, Fe and Mn elements. Abundant oriented fluid inclusions are founded in the studied beryl samples, including gas, liquid and solid phases. Most of these inclusions occur as single phases, while a handful of double-phase or triple-phase inclusions have also been found. Laser Raman investigations indicate that most of these inclusions are liquid and gas fluids, including CO2, N2 and H2O. The results suggest that the beryllium mineralization in pegmatites of the Mufushan area is probably related to the late-stage hydrothermal activity of the granitic complex. Abundant fluid inclusions found in the beryl crystals indicate that fluid activity could promote the chemical differentiation, migration, enrichment and precipitation of rare metal elements, therefore resulting in the local enrichment of mega-crystal beryl.
- beryl /
- inclusion /
- granitic pegmatite /
- Mufushan

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References

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