Late Cretaceous niobium mineralization in the Wuxiaoyang deposit, southeastern Zhejiang: Metallogenic characteristics and prospecting significance

被引：0
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作者：
Ding M. [1 ]
Che X. [1 ]
Rao C. [2 ]
Li X. [3 ]
Li W. [4 ]
机构：
[1] State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Jiangsu, Nanjing
[2] Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Zhejiang, Hangzhou
[3] State Key Laboratory of Lithosphere Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing
[4] Eleventh Geological Group of Zhejiang Province, Zhejiang, Wenzhou
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 11期
关键词：
columbite U-Pb chronology; Late Cretaceous; Nb-rich biotite; niobium deposit; southeast Zhejiang; Wuxiaoyang;
D O I：
10.19762/j.cnki.dizhixuebao.2023269
中图分类号：
学科分类号：
摘要：
The rare mental niobium-tantalum has multi-epoch metallogenic characteristics in South of China, and the Late Cretaceous metallogenic event as the latest metallogenic stage is rarely reported by predecessors. This paper focuses on the Wuxiaoyang Niobium deposit in southeast of Zhejiang Province. By combining field investigation, petrology, in situ microzone analysis of minerals and isotopic chronology, we determined that the main body of niobium mineralization is fine-grained biotite granite. The diagenetic and metallogenic ages are 89. 2 + 0. 8 Ma and 86. 5 + 1.0 Ma respectively, revealing an important Late Cretaceous granite emplacement and niobium mineralization event in this area. Niobium occurs in the form of independent minerals in columbite group mineral, rutile and plumbopyrchlore. In addition, part of niobium occurs in biotite. Under magma-hydrothermal interaction, the mica evolved from annite to protolithionite to zinnwaldite; the highest Nb-content of annite was 1253 X 10 , and the highest Nb-content of protolithionite and zinnwaldite was 794 X 10 . As the extremely Nb-rich characteristics of biotite indicate that the deposit has a very well niobium prospecting potential, the Nb-rich biotite can be used as an indicator mineral for niobium-tantalum prospecting. Based on the above mineralogical characteristics, there are two stages of niobium mineralization events in this deposit: firstly, the formation of primary columbite group minerals, Nb-rich biotite and rutile in magmatic stage; secondly, niobium migrates from magma and primary Nb-bearing minerals to form secondary niobium-containing oxides under late hydrothermal action. © 2023 Geological Society of China. All rights reserved.
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页码：3825 / 3845
页数：20
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