Volume 47 Issue 4
Apr.  2022
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Article Navigation >  Earth Science  > 2022  >  47(4): 1316-1332
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
shu

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
  • 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.

     

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