| 湘东北地区伟晶岩型锂矿成矿模型及找矿潜力分析 |
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| 引用本文：黄建中,陈剑锋,文春华,周厚祥,李胜苗,张立平,黄志飚,成永生,曹创华,刘钧,陈虎.2022.湘东北地区伟晶岩型锂矿成矿模型及找矿潜力分析[J].地球学报,43(4):527-541. |
| DOI：10.3975/cagsb.2022.042401 |
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| 基金项目:湖南省重点领域研发计划项目(编号: 2019SK2261);国家重点研发计划项目(编号: 2017YFC0601402);有色金属成矿预测与地质环境监测教育部重点实验室(中南大学)开放基金项目(编号: 2021YSJS04);湖南省自然科学基金(编号: 2021JJ30387);湖南省地质院科研项目(编号: HNGSTP202105);湖南省专项科普专题(编号: 2020ZK4082) |
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| 中文摘要:幕阜山地区在20世纪70年代发现了传梓源锂、铌钽矿床, 近年来在该区黄柏山、窄板洞地区亦有富锂伟晶岩报导, 但幕阜山地区锂矿资源尚未系统评价。锂矿资源作为新能源产业领域重要的原材料且需求日益增大, 开展幕阜山地区锂矿成矿潜力分析尤为重要。本文通过对黄柏山地区、传梓源矿区和窄板洞地区含锂矿伟晶岩详细的野外地质调查, 分析了含锂矿伟晶岩分布及含矿性特征, 认为含锂伟晶岩在空间上远离幕阜山岩体分布, 在垂向上锂矿化位于LCT型伟晶岩脉的上部。总结了湘东北地区铌钽矿伟晶岩和锂矿伟晶岩成岩、成矿年龄几近一致(140~130 Ma), 稍晚于区内二云母二长花岗岩形成年龄(143~138 Ma), 且同位素研究结果也指示花岗岩与伟晶岩有着相同的物质源区, 认为区内二云母二长花岗岩为稀有金属伟晶岩成矿母岩, 进而建立了伟晶岩型稀有金属矿成矿模型。依据成矿模型及区域稀有金属成矿的规律认识, 建立了“传梓源式”伟晶岩型锂矿预测要素, 首次对湘东北地区锂矿资源潜力开展预测评价, 初步预测黄柏山—传梓源和窄板洞—梭墩锂矿远景区内锂矿资源潜力达10.19万吨, 具备寻找大型锂矿产地(>10万吨)的潜力。 |
| 中文关键词:含锂矿伟晶岩 锂辉石 传梓源矿区 黄柏山地区 成矿模型 成矿潜力 |
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| The Metallogenic Model and Prospecting Potentiality of the Pegmatite Type Li Deposit in Northwestern Hunan Province |
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| Abstract:The rare metal deposits in Mufushan district, such as the Chuanziyuan Li-Nb-Ta deposit found in the 1970s and the Huangboshan and Zhaibandong Li deposits found in recent years, presently lack proper system evaluation targeting Li resources. However, Li is a key raw material in new energy industry development, with a growing demand. It is therefore necessary to analyze the metallogenic potential of the Li deposits in the Mufushan area. Using systematic field geological surveys of the Li-pegmatites in the Chuanziyuan, Huangboshan, and Zhaibandong Li deposits, this study analyzed the characteristics of the distribution and potentiality of the Li-pegmatites and showed that they are distributed far from the Mufushan batholith and that the Li mineralization occurs in the top the LCT-type pegmatites. Both the Li-pegmatites and Nb-Ta-pegmatites have the same diagenesis and mineralization ages (140~130 Ma), which occurred slightly later than the two-mica monzogranite (143~138 Ma). Furthermore, the pegmatites in this area have the same provenance as the two-mica monzogranite. Thus, here, we propose that the two-mica monzogranite could be the parental rock of the rare metal (Li-Nb-Ta) pegmatites and established the metallogenic model accordingly. Based on this forecasting model for the “Chuanziyuan” type Li deposit, we concluded that there are 101 900 tonnes of Li2O resources in the Huangboshan–Chuanziyuan and Zhaibandong–Suodun prospect area, showing that a large-scale Li deposit could exist in northwestern Hunan province. |
| keywords:Li bearing pegmatite spodumene Chuanziyuan deposit Huangboshan metallogenic model metallogenic potentia |
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