白云鄂博褐钇铌矿族矿物的矿物化学与矿物演化  

CHEMISTRY AND EVOIUTION OF FERGUSONITE-GROUP MINERALS, BAYAN OBO, INNER MONGOLIA

作　　者：贡伟亮[1] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002

出　　处：《矿物学报》1991年第3期200-207,共8页Acta Mineralogica Sinica

基　　金：国家自然科学基金

摘　　要：本文在大量矿物化学资料及高温XRD研究基础上提出了褐钇铌矿族矿物的分类命名方案,详细地研究了该族矿物的化学成分、稀土和特殊稀土组成及固溶关系。发现了M-钍褐铈铌矿、T-钛褐钕铌矿、M-钕褐铈铌矿以及T-钇褐钕铌矿等一批新变种矿物。确定了褐钇铌矿族矿物在时间和空间上的分异演化序列,并讨论了主稀土和特殊稀土在演化过程中的基本行为,首次提出了褐钇铌矿族矿物水解共沉淀形成机理新模式,并确认成矿流体多阶段演化过程中因介质物理化学条件不同,稀土元素配合物呈现的稳定性差异是本族矿物时空演化的根本原因。此外,本文还呼吁对白云鄂博西矿区铕等资源进行评介和开发。A new classification scheme of the fetgusonite-group minerals is suggested on the basis of mineral chemistry and high temperature XRD.A number of new varieties such as M-thorian fergusonite- (Ce), M-neodymian fergusonite-(Ce), T-tianian fergusonite-(Nd) and T-yttrian fergusonite-(Nd), have been recognized in the light of detailed chemical studies, particularly with reference to REE, SRE and solid solution relationship.The results indicate strong REE and SRE differentiation and evolution in the fergusonite group, which can be interpreted by differences in the stability of various REE complexes in response to variations in physicochemical conditions during the multi-stage mineralization process in the Bayan Obo ore deposit. The crystallization of the minerals is closely related to hydrolysis of REE and Nb complexes, REE(OH)_3·Nb(OH)_5 coprecipitation, dehydration, polymerization and nucleation. The significance of SRE (Eu) in the western part of the deposit is emphasized.

关 键 词：褐钇铌矿 矿物 稀土元素 化学 演化 

分 类 号：P578.4[天文地球—矿物学]