闪石族11～12种阳离子占位的X射线衍射估算  

X-ray Diffraction Estimation of 11～12 Cation Site-Occupancies of Amphibole Group

作　　者：孙以谏[1] 黄俊杰[1] 刘万余[1] 张建洪[2] 王冠鑫[3] 

机构地区：[1]南京地质矿产研究所,南京210016 [2]中国地质大学,北京100083 [3]中国科学院广州地球化学研究所,广州510640

出　　处：《岩石矿物学杂志》2000年第1期55-68,共14页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目!<闪石族类质同象及晶体化学的X射线研究>的全部成果(项目编号 :49413179)

摘　　要：本文扼要地介绍了用X射线衍射强度数据估算闪石族矿物各阳离子占位的方法。实测数据证实 ,这不仅在理论上是可能的 ,而且在实验上也是可行的。无论是钙质闪石还是碱性闪石 ,估算精度多数达到 90 %左右 ,可满足晶体化学研究之需。以估算的占位数按国际分类表判定的闪石种属与按成分分析的相比 ,两者的符合率达 80 %～ 85% ,从而否定了前辈学者“闪石族不能用X射线粉末法研究”的断言 ,在这一问题上取得了突破性进展。The present paper has revised and tested previous research results of theoretical analysis. Intensities of 18 characteristic peaks were picked up from 63 powder patterns of Ca_amphiboles which include 50 data from references and 13 measured data. By means of stepwise regression a series of experimental formulae were fitted between 18 characteristic reflection intensities and 11 cation site_occupanices to estimate the cation site_occupancy of Ca_amphibole with the precision of 78%～96%. As for Mg, Fe 2+ in Σ site (M 1+M 3+M 2), K and vacancy Em in A site and Si in T 1 site, the cation site_occupancy precisions approach 90%. The precision is up to 80% for named crystal chemical class in amphibole nomenclature. It is evident that the calculation of the cation site_occupancy of amphibloe group by X_ray powder diffraction is not only practical but also reliable. The authors have succeeded in extending this method to the alkali_amphibole subgroup. As Ca_Na ampohibloe subgroup is among 52 alkali_amphibloes, the method of estimating cation site_occupacies by X_ray powder diffraction is suitable for the whole amphibole subgroup.

关 键 词：闪石族 阳离子 占位 X射线衍射 线性统计模型 

分 类 号：P578.955[天文地球—矿物学] P575[天文地球—地质学]