滇东南建水稀土矿稀土数值特征及研究意义

为查明建水稀土矿的稀土数值特征,在长岭岗岩体风化壳的黏土层、全风化层、半风化层、弱风化层中采集了82件样品,进行全相稀土氧化物、离子相稀土氧化物质量分数分析,包括全相稀土氧化物的质量分数、离子相稀土氧化物的质量分数、全相与离子相稀土氧化物质量分数的相关系数、全相稀土氧化物在各个风化层位中的变化系数、离子相稀土氧化物在各个风化层位中的变化系数、结晶相稀土氧化物的质量分数。经资料整理,黏土层、全风化层、半风化层、弱风化层中的稀土数值有明显差异。造成稀土数值差异的主要原因为:成矿母岩的风化程度,稀土矿物离解程度,离子相稀土氧化物的迁移富集程度。加强稀土数值的研究,有助于深化风化壳离子吸附型稀土矿的成矿机理认识。

REE Characteristics and Research Significance of Jianshui Rare Earth Deposits in Southeastern Yunnan

In order to identify the numerical feature of rare earth in Jianshui rare earth ore,82 samples were collected from clay layer,completely weathering layer,partly weathering layer and weakly weathering layer in Changlinggang rock weathering crust.The mass fraction of all phase rare earth oxides and ionic phase rare earth oxides,the correlation coefficients between them,coefficient of variation for all phase rare earth oxides and ionic phase rare earth oxides in each weathering layer and the mass fraction of crystalline phase rare earth oxides were analyzed.According to the data,the rare earth values in the clay layer,the fully weathered layer,the semi-weathered layer and the weakly weathered layer are significantly different.The main reasons for the difference in rare earth values are the degree of weathering of the ore-forming parent rock,the degree of dissociation of rare earth minerals and the degree of migration and enrichment of ionic phase rare earth oxides.Strengthening the study of rare earth values will help to deepen the understanding of the mineralization mechanism of weathering crust ion-adsorption rare earth ore.