| Physicochemical Conditions of the Formation of Beryl and Aquamarin in Mufushan Granopegmatite Deposit,Hunan Province,China |
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| 作者姓名： | 李兆麟 牛贺才 |
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| 作者单位： | [1]DepartmentofGeology,ZhongshanUniversity,Guangzhou,510275 [2]InstituteofNewTechniquesforGeology,AcademiaS |
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| 摘 要： | The formation of the Mufushan granopegmatite was closely related to the Late Yenshanian multiphase and multistage magmatic activities,More than one generation of beryl and aquamarine occur in different types of pegmatite in the granites.The presence of melt and melt-fluid inclusions strongly indicates a melt-solution character of the pegmatitic magma.Forming temperatures of the different generations of beryl in a Na^ -K^ ,Ca^2 -CO3^2--Cl^--SO4^2- solution ranges from 990℃to 200℃.Aquamarine was formed at 720-180℃.The contents of alkali metals(Na^ K^ )in th ore-formming solution of aquamarine are lower than those in the beryl,but the contents of alkali earths(Ca) and salinity are higher,The granite was generated by remelting of the basement formation(meta-sedimentary rocks of the Lengjiaxi Group)which also served as the source of ore-forming material.Beryllium in the pegmatite was transported mainly in the form of NaBe(CO3)2],with part of it being complexed with Cl^- and SO4^2-.During the generation and evolution of the pegmatite,equilibrium might have been reached in the solid-melt-fluid or solid-fluid system.The intergranular solutions may have reacted with the early crystallized minerals,resulting in potash-feldsparization,albitization and muscovitization during which the ore-forming elements were mobilized and transported in favour of ore deposition.
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| 关 键 词： | 绿玉 流体包裹体 花斑岩矿床 绿宝石 物理化学 云南 成因 |
Physicochemical conditions of the formation of beryl and aquamarine in Mufushan granopegmatite deposit,Hunan Province,China |
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| Li Zhaolin,Mao Yanhua,Lei Lihong,Qiu Zhili,Niu Hecai.Physicochemical Conditions of the Formation of Beryl and Aquamarin in Mufushan Granopegmatite Deposit,Hunan Province,China[J].Chinese Journal of Geochemistry,1994,13(4):326-339. |
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| Authors: | Li Zhaolin Mao Yanhua Lei Lihong Qiu Zhili Niu Hecai |
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| Institution: | (1) Department of Geology, Zhongshan University, 510275 Guangzhou;(2) Institute of New Techniques for Geology, Academia Sinica, 510640 Guangzhou |
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| Abstract: | The formation of the Mufushan granopegmatite was closely related to the Late Yenshanian multiphase and multistage magmatic
activities. More than one generation of beryl and aquamarine occur in different types of pegmatite in the granites. The presence
of melt and melt-fluid inclusions strongly indicates a melt-solution character of the pegmatitic magma. Forming temperatures
of the different generations of beryl in a Na+-K+-Ca2+-CO3
2−-Cl−-SO4
2− solution ranges from 990 °C to 200 °C Aquamarine was formed at 720–180 °C. The contents of alkali metals (Na+ + K+) in the ore-formming solution of aquamarine are lower than those in the beryl, but the contents of alkali earths (Ca) and
salinity are higher. The granite was generated by remelting of the basement formation (meta-sedimentary rocks of the Lengjiaxi
Group) which also served as the source of ore-forming material. Beryllium in the pegmatite was transported mainly in the form
of Na2Be(CO3)2], with part of it being complexed with Cl− and SO4
2−. During the generation and evolution of the pegmatite, equilibrium might have been reached in the solid-melt-fluid or solid-fluid
system. The intergranular solutions may have reacted with the early crystallized minerals, resulting in potash-feldsparization,
albitization and muscovitization during which the ore-forming elements were mobilized and transported in favour of ore deposition.
This project was jointly funded by the National Natural Science Foundation of China and the Open Laboratory of Ore Deposit
Geochemistry, Academia Sinica. |
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| Keywords: | granopegmatite: beryl aquamarine melt-fluid inclusion |
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