鄂西北碱性火山岩型铌矿床榍石矿物学及对铌富集机理的指示

苌笙任; 苏建辉; 秦志军; 赵新福

doi:10.3799/dqkx.2021.134

Volume 47 Issue 4

Apr. 2022

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Chang Shengren, Su Jianhui, Qin Zhijun, Zhao Xinfu, 2022. Titanite Mineralogy and Its Implications for Nb Enrichment Mechanism of Alkaline Volcanic-Rock Hosted Nb Deposit in NW Hubei Province. Earth Science, 47(4): 1316-1332. doi: 10.3799/dqkx.2021.134

Citation:

Chang Shengren, Su Jianhui, Qin Zhijun, Zhao Xinfu, 2022. Titanite Mineralogy and Its Implications for Nb Enrichment Mechanism of Alkaline Volcanic-Rock Hosted Nb Deposit in NW Hubei Province. Earth Science, 47(4): 1316-1332. doi: 10.3799/dqkx.2021.134

Citation:

Chang Shengren, Su Jianhui, Qin Zhijun, Zhao Xinfu, 2022. Titanite Mineralogy and Its Implications for Nb Enrichment Mechanism of Alkaline Volcanic-Rock Hosted Nb Deposit in NW Hubei Province. Earth Science, 47(4): 1316-1332. doi: 10.3799/dqkx.2021.134

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Titanite Mineralogy and Its Implications for Nb Enrichment Mechanism of Alkaline Volcanic-Rock Hosted Nb Deposit in NW Hubei Province

doi: 10.3799/dqkx.2021.134

1.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Hubei Geological Survey, Wuhan 430034, China

Received Date: 2021-02-05
Available Online: 2022-04-29
Publish Date: 2022-04-25

Abstract

Abstract

The Tianbao niobium deposit, located in the Wudang area of the South Qinling belt, is a typical alkaline volcanic-rock hosted Nb deposit in China. However, the research on the origin and evolution of alkaline magma as well as the enrichment mechanism of Nb is lacking. The alkaline volcanic rocks in Tianbao can be divided into trachyte series and alkaline basalt series, which are spatially associated. In this study, it presents detailed petrography observation combined with in-situ U-Pb dating of titanite by LA-ICP-MS, and in-situ element analyses of different types of titanite by EPMA, to reveal the magma evolution and the Nb enrichment processes. The trachyte rocks have titanite U-Pb age of 432.4±4.4 Ma(n=30, MSWD=2.4), which is consistent with the zircon U-Pb age of other trachytes, mafic dykes, and carbonatite-alkaline complexes in the South Qinling belt, indicating that the study area had large-scale alkaline magmatism activation in the Early Silurian. The titanite from both trachyte and alkaline basalt rock are of magmatic and detrital origins based on their occurrences and geochemical characteristics. Most magmatic titanite grains are euhedral and coarse, and have oscillating zoning, while some grains are present in the form of small particles around the titanite phenocrysts. They have lower Al contents and Al/Fe ratios compared to detrital titanites, which are typically fragmented. The magmatic titanites in the early basaltic rock have lower concentrations of Nb₂O₅ (< 0.47%), Na₂O (< 0.05%) and REE₂O₃ (< 0.87%), but have a large variety of Al₂O₃+ Fe₂O₃ (0.80%-2.91%), indicating that the Nb content in the early basaltic magma is relatively low. The magmatic titanites in the trachyte are obviously enriched in Nb₂O₅ (0.19%-1.50%) and REE₂O₃ (0.02%-4.06%). Trachytes also contain fine-grained other Nb minerals such as pyrochlore, columbite, and aeschynite, indicating that the contents of Nb are significantly increased during magma fractionation from basalt to trachyte, and eventually lead to ore-grade mineralization in trachyte.
- NW Hubei Province,
- alkaline volcanic-rock hosted Nb deposit,
- titanite mineralogy,
- petrogenesis and ore-forming process,
- ore deposit

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References(57)

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Titanite Mineralogy and Its Implications for Nb Enrichment Mechanism of Alkaline Volcanic-Rock Hosted Nb Deposit in NW Hubei Province

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