用氢氧化物共沉淀法研究热液体系REE(Nb,Ti)_2O_6型矿物的形成机理

A STUDY ON THE FORMATION MECHANISM OF REE (Nb, Ti)_2O_6-TYPE MINERALS IN THE HYDROTHERMAL SYSTEM BASED ON THE EXPERIMENT ON HYDROXIDE COPRECIPITATION

作者进行了稀土铌钛氢氧化物共沉淀实验,对共沉淀物及其高温灼烧产物进行了XRD、IR、DTA和Raman研究,结合前人高温高压实验结果以及野外地质事实,提出了热液体系复杂氧化物矿物易解石和黑稀金矿的络合物高温水解、氢氧化物共沉淀、脱水去羟、聚合成核和结晶的成因模式。

The experiment on REE-Nb-Ti hydroxide coprecipitation was done and the coprecipitated materials and their thermal products were analyzed using XRO, DTA, IR and Raman spectroscopy. In conjunction with the geological facts and previous studies, a new genetic model for the complex oxide minerals (aeschynite and euxenite) formed in the hydrothermal system is presented in this paper. High temperature hydrolysis of the F-CO_3-O complexes of Nb, Ti and REE, hydroxide coprecipitation, dehydration, polymerization, nucleation and crystallization are involved in the model. The model is favourable to the hydrothermal genesis of the Bayan Obo Nb-REE-Fe complex deposits.