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江西宜春甘坊矿田花岗岩型锂矿床地质特征及找矿模型

Geological characteristics and prospecting model of granite type lithium deposits in Ganfang ore field,Yichun City of Jiangxi
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摘要 江西宜春甘坊矿田花岗岩型锂矿床位于江南成矿带中段南部赣西九岭稀有金属成矿带内,是我国少数几个硬岩型锂矿勘查基地之一。本文在分析总结该地区矿床地质特征、成矿规律、控矿因素和找矿标志基础上,建立花岗岩型锂矿床交代成矿模式,提出“区域构造+花岗岩侵入+围岩封闭+热液交代+化探异常”花岗岩型锂矿床“五位一体”找矿模型。结果表明,该矿床主要赋存在燕山晚期蚀变白云母花岗岩体顶部,呈面型分布,有上富下贫的特征。其区域构造和燕山晚期花岗岩侵入体控制锂矿床的定位,围岩封闭条件和岩浆晚期热液交代作用是锂成矿的关键。该矿床成因类型为岩浆晚期热液交代矿床。 Ganfang ore field in Yichun City,Jiangxi is located in the south part of the central section of Jiangnan mineralization belt,within Jiuling rare metal mineralization belt in West Jiangxi.It is one of the few hard rock lithium exploration bases in China.On the basis of analysis and summary of the geological characteristics,ore-forming regularity,ore-controlling factors,and prospecting indicators of the deposits in the region,this article establishes a granite type lithium deposit metasomatic mineralization model and proposes a"five in one"prospecting model for granite type lithium deposits,which includes regional structure,granite intrusion,surrounding rock sealing,hydrothermal metasomatism,and geochemical anomaly.The result indicates that the deposit is mainly hosted on the top of the Late Yanshan altered muscovite granite body,with a planar distribution and the feature of upper enrichment and lower impoverishment.The regional structure and late Yanshan granite intrusion control the positioning of lithium deposits,and the sealing condition of surrounding rocks and the late magmatic hydrothermal metasomatism are the key factors for lithium mineralization.The genesis type of this deposit belongs to the late magmatic hydrothermal metasomatic deposit.
作者 尹维青 刘成忠 董菁 YIN Weiqing;LIU Chengzhong;DONG Jin(Jiangxi Nonferrous Metals Prospecting and Exploration Institute,Nanchang 330030,Jiangxi,China)
出处 《矿产与地质》 2023年第6期1191-1202,共12页 Mineral Resources and Geology
关键词 锂矿 花岗岩型 地质特征 找矿模型 江西宜春 lithium deposit granite type geological characteristics prospecting model Yichun City of Jiangxi
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