摘要
通过对赣南江贝稀土矿床进行岩相学、矿床学和地球化学研究,表明该矿床成矿母岩主要为寻乌岩组变质岩,岩性有变粒岩、片岩和片麻岩,其中云母片岩稀土元素含量最高,是最有利的成矿母岩,属轻稀土富集型母岩,是近些年新发现的1处中深变质岩风化壳离子吸附型稀土矿。矿区呈低缓丘陵地貌,风化壳平均厚度12.33 m,矿体主要赋存于全风化层中,矿体平均厚度4.68 m,SRE2O3品位0.035%~0.122%,属离子吸附型稀土矿。稀土主要来源于易风化的水磷酸盐类矿物和稀土氟碳酸盐类矿物,风化壳化学蚀变指数CIA>90%,表明了强烈的风化作用为矿床的形成创造了有利条件。会昌—安远—寻乌地区中深变质岩广泛分布,具有大型稀土矿成矿潜力。
Through the petrographic,geochemical and mineral deposit studies of Jiangbei rare earth deposit in Southern Jiangxi,the results show the metallogenic mother rocks are mainly the metamorphic rocks of Xunwu Formation complex,with the lithology of granulite,schist and gneiss,among which the mica schist with the highest content of REEs serves as the most favorable parent rock,belonging to the LREE-enriched parent rock.The orefield is a low hilly terrain with average weathering crust thickness of 12.33 m.The orebody is mainly occurred in the completely weathered layer with the average thickness of 4.68 m and SRE2O3 grade of 0.035%~0.122%,belonging the ion adsorption rare earth deposit.The rare earth mainly comes from easily weathered water phosphate minerals and rare earth fluorocarbon minerals,with the chemical alteration index of weathering crust CIA>90%,indicating that the strong weathering contributes to the formation of deposit.The Huichang-Anyuan-Xunwu area where the mesometamorphic rocks are widely distributed has metallogenic potential of large rare earth deposits.
作者
刘海波
陈斌锋
彭琳琳
赵芝
张兴文
LIU Hai-bo;CHEN Bin-feng;PENG Lin-lin;ZHAO Zhi;ZHANG Xing-wen(Gannan Geological Survey Party, Bureau of Geology and Exploration and Development of Mineral Resources of Jiangxi Province, Ganzhou 341000, China;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China)
出处
《华东地质》
2020年第4期315-324,共10页
East China Geology
基金
江西省地质勘查基金“江西省寻乌县江贝稀土矿预查(编号:20160015)”
基本科研业务费专项基金“赣南变质岩离子吸附型稀土矿成矿规律与找矿方向研究(编号:YYWF201527)”项目联合资助。
关键词
赣南
中深变质岩
离子吸附型稀土矿
地质特征
矿床成因
Southern Jiangxi
mesometamorphic rock
ion-adsorption REE deposit
geological characteristics
genesis of deposit
