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摘要:
铌、钽矿产分布较广。内生铌钽矿成矿类型主要为伟晶岩型、稀有金属花岗岩型、碳酸岩型和碱性岩型;外生矿床多为内生矿床经过风化和沉积等外生作用发生二次富集的风化壳型和残坡积、冲积砂矿型。从成矿时代来看,伟晶岩型矿床成矿时代跨度较大,从3.08 Ga到0.19 Ga;碱性岩型矿床主要成矿期分别在2.25~1.35 Ga和0.75~0.19 Ga;碳酸岩型矿床成矿期主要分布在0.75~0.6 Ga和0.4~0.35 Ga;花岗岩型主要分布在0.75~0.19 Ga的中晚期。碳酸岩型铌矿床和伟晶岩型钽矿床是目前勘探的主要目标。
Abstract: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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致谢: 南京地质调查中心陈世忠研究员对文稿进行了认真审阅和修改;审稿专家和编辑提出了宝贵修改意见。在此一并表示诚挚的感谢。
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图 1 稀有金属花岗岩母岩之上含LCT伟晶岩分带及矿化示意图(改自Černý, 1991)
Figure 1. Schematic representation of LCT pegmatite zoning and mineralization above a parental granite (modified from Černý, 1991)
图 2 不同成矿类型钽矿成矿时代分布图(改自Tkachev et al., 2019)
Figure 2. Mineralization epoch distribution of different Ta metallogenic types (modified from Tkachev et al., 2019)
图 3 圣—奥能瑞碱性杂岩体示意图(改自Tremblay et al., 2017)
Figure 3. Schematic diagram of Saint-Honoré alkaline complex (modified from Tremblay et al., 2017)
图 4 西澳克拉通伟晶岩型锂矿地质概况(据Kendall-Langley et al., 2020)
Figure 4. Distribution of lithium pegmatite deposits in Western Australia Craton (after Kendall-Langley et al., 2020)
图 5 皮廷加成矿省Madeira花岗岩和Agua Boa花岗岩地质图(据Costi et al., 2002)
Figure 5. Geology map of Madeira granite and Agua Boa granite in Pitinga (after Costi et al., 2002)
图 6 基巴拉褶皱带地质略图(改自Fernandez-Alonso et al., 2012)
Figure 6. Simplified geological map of Kibara fold belt(modified from Fernandez-Alonso et al., 2012)
表 1 铌钽矿床类型划分(据British Geological Survey, 2011)
Table 1 Classification of global Nb-Ta deposits(after British Geological Survey, 2011)
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