Citation: | YAO Chunyan, WANG Tiangang, NI Pei, YAO Zhongyou, GUO Weimin, ZHU Yiping, WANG Wei. 2021. Metallogenic types, characteristics and research progress of Nb-Ta deposits[J]. Geology in China, 48(6): 1748-1758. doi: 10.12029/gc20210607 |
Niobium and tantalum resources are widely distributed in the world. Their endogenous metallogenic deposits are mainly hosted in pegmatite, rare-metal granite, carbonatite, and alkaline rocks. Their exogenetic deposits are mostly the products of secondary enrichment through exogenous processes such as weathering and deposition from endogenous deposits. The metallogenic epoch of pegmatite-hosted deposits has a large span from 3.08 Ga to 0.19 Ga; alkaline rock-hosted deposits are at 2.25-1.35 Ga and 0.75-0.19 Ga respectively; carbonatite-hosted deposits are mainly in 0.75-0.6 Ga and 0.4-0.35 Ga; and granite-hosted deposits are mainly distributed in the middle and late stages of 0.75-0.19 Ga. At present, carbonatite-hosted niobium deposits and pegmatite-hosted tantalum deposits are the main exploration targets.
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Schematic representation of LCT pegmatite zoning and mineralization above a parental granite (modified from Černý, 1991)
Mineralization epoch distribution of different Ta metallogenic types (modified from Tkachev et al., 2019)
Schematic diagram of Saint-Honoré alkaline complex (modified from Tremblay et al., 2017)
Distribution of lithium pegmatite deposits in Western Australia Craton (after Kendall-Langley et al., 2020)
Geology map of Madeira granite and Agua Boa granite in Pitinga (after Costi et al., 2002)
Simplified geological map of Kibara fold belt(modified from Fernandez-Alonso et al., 2012)