江西某离子吸附型稀土矿床元素地球化学行为及成矿机理

项目名称： 江西某离子吸附型稀土矿床元素地球化学行为及成矿机理

项目编号： No.41303035

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 赵芝

作者单位： 中国地质科学院矿产资源研究所

项目金额： 25万元

中文摘要： 江西某离子吸附型稀土矿床位于南岭W-Sn-Mo-Be-REE-Pb-Zn-Au成矿带东段，为花岗岩成因的轻稀土型矿床，矿体赋存在黑云母钾长花岗岩全风化层中。最新的研究发现，该矿床平面上和垂向上均发育重稀土配分型风化壳，并已达到工业品位。但是轻、重稀土配分型风化壳的空间分布特征、形成过程以及稀土元素再分配的机理等科学问题尚未理清。本申请拟以该离子吸附型稀土矿床中的轻、重两类稀土配分型风化壳及基岩为研究对象，查明基岩和风化壳各层中稀土载体矿物组合、含量、成分、风化程度及演变特征；分析风化壳中主要元素、微量元素和稀土元素的富集与贫化规律；探讨轻、重稀土成矿机理，为区域上同类离子吸附型稀土矿成矿机制提供参考，也为离子吸附型重稀土矿床的勘查提供指导作用。

中文关键词： 寨背花岗岩；风化壳；稀土元素；流体交代；风化强度

英文摘要： Located in the east of Nanling W-Sn-Mo-Be-REE-Pb-Zn-Au metallogenic belt, An certain iron-absorbed type REE deposit is a LREE-type ore deposit of granite genesis, and the orebody occurs in the completely weathered layer of biotite moyite. The latest study shows that the weathered crust of HREE distribution type is developing in the plane and vertical of the deposit, attaining the industrial grade. However, the characteristics of spatial distribution,the formation process and the mechanism of REE redistribution and so forth concering LREE and HREE distribution-type weathered crust are yet to be clear. Taking the weathered crust of LREE and HREE and related granites of this iron-absorbed REE deposit as research subjects, this application is to identify the combination, content, ingredient, stability and evolutional characteristics of minerals of REE carrier(primary minerals,clay minerals after weathering and residual minerals containing REE in bedrock) in each layer of weathered crust profile, analyze the enrichment and impoverishment discipline of major element, trace element and rare element of the weathered-layer profile, and also discuss the metallogenic mechanism of ore-bearing LREE or HREE, for the purpose of providing the reference to mechanism of regional iron-absorbed type REE deposit of the same kind and

英文关键词： Zhaibei granite；weathering crust；rare earth elements (REEs)；hydrothermal alteration；weathering degree