Abstract：
Understanding the complex geochemical characteristics of rare earth elements (REEs) in the weathering profile of ion-adsorbed rare earth ore is a crucial issue for establishing the best leaching agent dosage during in-situ leaching processes. This study focuses on soil samples collected from nine drill holes located at three hillslopes of a mining area in southwest Fujian. Analyzing the geochemical features of REEs revealed that the ore predominantly comprises Y, La, Ce, and Nd, with Y being the most abundant, constituting 20.24 %-33.64 % of total rare earth elements (TREEs) in each weathering profile. This categorizes the ore as an yttrium-rich heavy rare earth ion-adsorbed mine. Notably, REEs exhibit a concentration in the middle layer of the weathering profile, with content increasing first and then declining with deeper depth from the surface to the bottom. The ratio of light rare earth elements (LREEs) to heavy rare earth elements (HREEs) diminishes noticeably from shallow soil to middle soil, while deep soil reveals a slightly higher ratio than middle soil. These findings offer valuable insights into the scientific mining of this area and similar ion-adsorbed rare earth mines concerning their economic potential.
摘要：
了解稀土元素（REE）在离子吸附型稀土矿石的风化剖面中的复杂地球化学特征是在原位浸出过程中确定最佳浸出剂用量的关键问题。本研究的重点是从福建西南部某矿区三个山坡上的九个钻孔中收集的土壤样品。分析稀土元素的地球化学特征，发现矿石主要包含Y，La,Ce,Nd,Y是最丰富的，在每个风化剖面中占稀土元素(TREEs)总量的20.24%-33.64%。这将矿石归类为富含钇的重稀土离子吸附矿。值得注意的是,稀土元素在风化剖面的中间层表现出浓度，含量先增加后下降，从表面到底部的深度更深。轻稀土元素（LREE）与重稀土元素（HREE）的比例从浅层土壤到中部土壤显着降低，而深层土壤显示出比中部土壤略高的比率。这些发现为该地区的科学开采以及类似的离子吸附型稀土矿山的经济潜力提供了宝贵的见解。
