贵州织金新华含稀土磷矿床矿区土壤稀土元素分布特征  

The REE Concentration and Distribution in Soils from the Xinhua REE-bearing Phosphorous Deposit, Zhijin County, Guizhou Province

作　　者：陈吉艳[1] 张杰[1] 

机构地区：[1]贵州大学资源与环境学院,贵阳550003

出　　处：《矿物岩石地球化学通报》2005年第1期71-74,共4页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(50164001)

摘　　要：稀土元素分析结果表明,贵州织金新华含稀土磷矿床矿区上层土壤中普遍富集稀土元素,其∑REE较高,但比含稀土磷块岩低,表明磷块岩在风化过程中已有部分稀土元素流失。轻稀土元素La、Ce及Y大量集中,LREE／HREE比值较高,说明岩石在风化过程中形成的粘土矿物对稀土元素有一定的吸附作用。但是粘土矿物对稀土元素的吸附量小于REE易溶配合物的流失量。稀土元素球粒陨石标准化模式曲线及Ce异常等特征表明,织金新华含稀土磷矿床矿区土壤中稀土元素分配模式继承了原岩特征。The REE compositions of the soil samples collected from the cover soil of the phosphorite-ores of the Xinhua REE hearing phosphorous deposit indicate that the soils are rich in REE elements with relatively high ∑REE contents, though their ∑REE contents are lower than those of the phosphorite. It seems that a part of REE was depleted during the phosphorite weath ering. The abundant Y, La, Nd and the relative high ratios of LREEE/HREE indicate that REE was adsorbed in some extent by the clay minerals during the weathering process. However, The absorbed REE extent by clay minerals is smaller than the lost one of the dissolvable REE compound. The chondrite-normalized REE patterns and the Ce anomaly showed that the REE distribution pattern of the soil, covered on the phosphorite ores of the Xinhua REE-bearing phosphorous deposit, had inherited the characteristics from its original rocks.

关 键 词：稀土元素 磷矿床 REE 球粒陨石 原岩 粘土矿物 风化 矿区土壤 流失量 标准化模式 

分 类 号：P619.213[天文地球—矿床学] S154[天文地球—地质学]