广东惠东地区离子吸附型稀土矿床地球化学特征  

Geochemical Characteristics of Ion-adsorption Type Rare Earth Elements Deposit in Huidong,Guangdong

作　　者：苑鸿庆 李社宏 缪秉魁 严松 粟阳扬 

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029 [2]中国科学院大学,北京100049 [3]地质流体与地质过程广西高校重点实验室,广西桂林541004

出　　处：《现代地质》2016年第6期1267-1275,共9页Geoscience

基　　金：中国地质调查局项目(1212011120354)

摘　　要：运用岩石地球化学方法,对广东惠东地区离子吸附型稀土矿床的地球化学特征进行研究。结果显示,风化壳中元素含量及配分特点总体上取决于母岩,但稀土元素在继承母岩稀土元素的基础上含量进一步富集,且各风化层中元素含量变化与风化作用之间具有一定相关性。WIG指数相较于CIA指数能更有效地描述风化壳风化强度,风化壳中稀土元素迁出富集与WIG指数及元素迁移系数具有一定规律性,轻稀土元素多在全风化层上部富集,而重稀土元素在全风化层下部及半风化层明显迁入富集,Ce、Eu均具明显负异常。Based on geochemical research,we analysis the weathering crust of ion-adsorption type REE deposit in Huidong area,Guangdong. The data show that the content of Ca O,Na2 O and K2 O are decreased with the increase of weathering,Al2O3 is opposite. The trace elements such as Ba,Sr,U and REE are enriched in the semi-weathered layer and weathered layer. The characteristics of distribution and content of the elements in weathering crust profile reflect the nature of parent granite. The index of WIG is more effectively to describe the weathering degree of the profile than CIA. The degree of weathering and enrichment of REE decrease with the increase of WIG. It can be concluded that LREE are abundant in upper of weathering layer,while HREE are abundant in semi-weathered layer and in lower part of the weathered layer. Eu and Ce are significantly loss in area where enrichment of the REE.

关 键 词：离子吸附型稀土矿床 地球化学特征 化学风化程度 元素质量迁移系数 广东惠东地区 

分 类 号：P596[天文地球—地球化学]