现代地质2025，Vol.39Issue(3)：704-714,11.DOI:10.19657/j.geoscience.1000-8527.2024.042
稀土元素对褐帘石晶体结构的精细影响研究
Research on the Atomic Level Structure Effects by Rare Earth Elements Substitutions in Allanite of Different Occurrence
摘要
Abstract
Allanite is a common accessory phase in granite,skarn and granite pegmatite.As the major carrier of light rare earth elements(LREE)and trace elements such as Th,U and Sr,allanite can control LREE content well within the critical temperature range of the subduction zone.The effect of changes that its composition to structure have directive influence to the research of earth science.This paper summarise the characteristics of the cell parameters of the three epidote group minerals contain allanite,epidote and zoisite through a series sys-tematic structural and chemical compositional analyses.Such as single-crystal X-ray diffraction(XRD),powder X-ray diffraction,and LA-ICP-MS.We discuss the effects of composition on the structure in the epidote group minerals on the basis of the series of analyses.According to experimental data comparisons,as REE3+substi-tutes for Ca2+and occupies the A2 site,the unit cell parameters a,b,c and V of the epidote-group minerals exhibit corresponding increases.The change in unit cell volume is particularly significant,expanding from 457.92 Å3 to 479.93 Å3,representing a volume increase of approximately 4.8％.Additionally,the(110),(31(1)),(222+123+114),(322+42(4)),and(307)lattice planes of allanite can indirectly reflect the con-tent and occupancy of REEs within the mineral structure.This study investigates the crystal structure and chem-ical composition of allanite,revealing the regulatory mechanism of rare earth elements(REEs)substituting for Ca2+and its geochemical significance.关键词
褐帘石/稀土元素/晶体结构/晶胞参数/多面体体积Key words
allanite/REE/crystal structure/cell parameters/polyhedral volume分类
地质学引用本文复制引用
徐晶晶,李林,杨小男..稀土元素对褐帘石晶体结构的精细影响研究[J].现代地质,2025,39(3):704-714,11.基金项目
国家自然科学基金-基金委重大计划培育项目(28832020004). （28832020004）
