投稿时间：2021-06-05
修订日期：2021-07-10
网络发布日期：2021-08-30
中文摘要:幕阜山稀有金属矿集区位于江南造山带中段，是中国典型的具良好成矿潜力的大型复式岩基，近年来在其周边发现了仁里等超大型高品位矿床。全岩地球化学及同位素特征研究显示，幕阜山岩基是由深部同源岩浆支撑的跨地壳岩浆系统，经岩浆多次脉动上涌而形成的“体中体”模式复式岩基。文章通过梳理幕阜山岩浆时-空-物质演化特征，认为岩基总体呈现出由东北向西南侵入时代由老至新（154~138 Ma），岩浆演化程度逐渐升高（黑云母花岗岩K/Rb比值为388~133，二云母花岗岩K/Rb比值由190~160），稀有金属成矿组合由单一至多样（Be矿化至Be+Nb+Ta+Li综合矿化），成矿强度逐渐变大的趋势，暗示岩基西南缘成矿条件最优。幕阜山西南缘仁里矿床地质特征及矿物地球化学研究表明，成矿相关岩体位于矿床东北部，由东北至西南伟晶岩类型由低到高呈现出清晰的水平分带，矿床西侧和西南侧具有较大找矿潜力。根据以上区域稀有金属的成矿规律，笔者团队在幕阜山西南缘黄柏山地区发现1处稀有金属伟晶岩密集区，并结合区域地质条件开展了“高覆盖区化探低值异常解译”的勘探，于伟晶岩密集区外围的植被高度覆盖区取得了进一步的找矿成果，为成矿理论指导资源精细勘查提供了参考。
Abstract:The Mufushan batholith in the middle part of Jiangnan orogenic belt is a typical batholith complex with good rare metal metallogenic potential in China. In recent years, super large and high-grade deposits such as Renli were found in this rare metal ore concentration area. Whole rock geochemistry and isotopic characteristics show that the Mufushan batholith is a complex batholith which is formed by multiple pulsating and upwelling of magma from deep homologous magma chamber. Based on the time-space-material evolution characteristics of Mufushan magma, it is considered that the intrusive ages of the batholith from northeast to southwest are from old to young (from 154 Ma to 138 Ma), and the degree of magma evolution is gradually increasing (K/Rb ratio of biotite granite is from 388 to 133 while K/Rb ratio of two-mica granite is from 190 to 160), The metallogenic combination of rare metals is from single to composite (Be → Be + Nb + Ta + Li). The increasing trend of rare metal metallogenic intensity indicates that the southwestern margin of the batholith has the best ore-forming conditions. The geological characteristics and mineral geochemistry of the Renli deposit in the southern margin of Mufushan batholith show that the ore-forming related rock bodies are located in the northeast of the deposit, the pegmatite types show clear horizontal zoning from northeast to southwest, and the west and southwest sides of the deposit have great prospecting potential. Under the guidance of regional rare metal metallogenic regularity, a rare metal pegmatite prospective area was successfully identified in Huangbaishan area, southwest margin of Mufushan batholith. Combined with regional geological conditions, the exploration approach demonstration program "interpretation of low value geochemical anomaly in high coverage area" was carried out, and good prospecting results were obtained in thick vegetation coverage area.
keywords:geology rare-metal pegmatite metallogenic regularity application of ore exploration Huangbaishan pegmatite concentrated area Mufushan batholith complex
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基金项目:本文得到国家重点研发计划课题（编号：2019YFC06050203、2019YFC06505202）和国家自然科学基金（编号：42002109、41872096）联合资助
引用文本：
李鹏,张立平,李建康,黄志飚,周芳春,姜鹏飞.2021.江南造山带中段幕阜山地区稀有金属成矿规律及其在找矿中的应用[J].矿床地质,40(4):819~841LI Peng,ZHANG LiPing,LI JianKang,HUANG ZhiBiao,ZHOU FangChun,and JIANG PengFei.2021.Metallogenic regularity of rare metal deposits in Mufushan area of Central China, and its application in ore prospecting[J].Mineral Deposits40(4):819~841
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