华南幕阜山花岗伟晶岩的矿物化学特征及指示意义

李乐广; 王连训; 田洋; 马昌前; 周芳春

doi:10.3799/dqkx.2018.378

Volume 44 Issue 7

Jul. 2019

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Li Leguang, Wang Lianxun, Tian Yang, Ma Changqian, Zhou Fangchun, 2019. Petrogenesis and Rare-Metal Mineralization of the Mufushan Granitic Pegmatite, South China: Insights from in Situ Mineral Analysis. Earth Science, 44(7): 2532-2550. doi: 10.3799/dqkx.2018.378

Citation:

Li Leguang, Wang Lianxun, Tian Yang, Ma Changqian, Zhou Fangchun, 2019. Petrogenesis and Rare-Metal Mineralization of the Mufushan Granitic Pegmatite, South China: Insights from in Situ Mineral Analysis. Earth Science, 44(7): 2532-2550. doi: 10.3799/dqkx.2018.378

Citation:

Li Leguang, Wang Lianxun, Tian Yang, Ma Changqian, Zhou Fangchun, 2019. Petrogenesis and Rare-Metal Mineralization of the Mufushan Granitic Pegmatite, South China: Insights from in Situ Mineral Analysis. Earth Science, 44(7): 2532-2550. doi: 10.3799/dqkx.2018.378

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Petrogenesis and Rare-Metal Mineralization of the Mufushan Granitic Pegmatite, South China: Insights from in Situ Mineral Analysis

doi: 10.3799/dqkx.2018.378

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Wuhan Center, China Geological Survey, Wuhan 430205, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, Wuhan 430074, China
4.
Hunan Nuclear Geology 311 Brigade, Changsha 410100, China

Received Date: 2018-12-05
Publish Date: 2019-07-15

Abstract

Abstract

Granitic pegmatites are widely distributed in the inner and adjacent region of the Late Mesozoic Mufushan granitic complex in South China. Some of them are rich in Li-Nb-Ta and related elements, forming large-ultra-large rare metal deposits. This study focuses on the lithium-poor pegmatites from Duanfengshan area in the northern Mufushan and the newly discovered lithium-rich pegmatite from Renli area in the south. Hereby we provided detailed petrographic and in situ EPMA and LA-ICP-MS geochemical analysis of major and characteristic minerals (feldspar, mica, tourmaline, garnet, beryl, columbite-tantalite) from the Mufushan pegmatites, aiming to constrain the classification, evolution and mineralization of the investigated pegmatites. Based on the combination of the characteristics minerals, the Mufushan pegmatites have been divided into five groups:Tur-pegmatite, Tur-Brl-pegmatite, Brl-pegmatite, Col-Brl-pegmatite in Duanfengshan area and Elb-Lpd-pegmatite in Renli area. Compositional variation of feldspar, mica, tourmaline and garnet from the studied pegmatites display continuous magmatic evolution sequence. From low to high evolution degrees, the Mufushan pegmatites are Tur-pegmatite→Tur-Brl-pegmatite→Brl-pegmatite→Col-Brl-pegmatite→Elb-Lpd-pegmatite, corresponding to the mineralization stages of metal barren→(Be-bearing)→Be-rich→Be, Nb, Ta-rich→Li, Be, Nb, Ta-rich, respectively. This result indicates that the Renli pegmatites have evolved to a relatively late-stage with various rare metal enrichment, which thus has higher potential of Li-Nb-Ta polymetallic mineralization. In contrast, the evolutionary degrees of Duanfengshan pegmatites are relatively low. A strongly zoned tourmaline crystal has been observed in the Tur-Brl-pegmatite from Duanfengshan area, in which five compositional zones from inside to outside can be divided. The content of incompatible elements such as Li, Zn, Ga, Ge, Nb, Ta, Sn, Pb gradually increased from inner to outter, which clearly recording the normal magmatic evolution sequences and the rare metal enrichment processes. Combined with previous studies, our work suggests that the Mufushan pegmatites are generated by extremely prolonged fractional crystallization of the Mufushan massive granitic magma, representing the final-stage product of granitic magma.
- Mufushan,
- granitic pegmatites,
- rare metal mineralization,
- in situ microanalysis,
- fractional crystallization,
- geochemistry

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References(53)

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Petrogenesis and Rare-Metal Mineralization of the Mufushan Granitic Pegmatite, South China: Insights from in Situ Mineral Analysis

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