摘要
本文对旅大地区金伯利岩中三个世代铬尖晶石进行了穆斯堡尔谱研究,结果表明晚期结晶的第三世代铬尖晶石不仅Fe^(3+)含量高,且有部分反尖晶石型结构特征,即Fe^(3+)可同时存在于八面体和四面体结构位置中,并确定了它们的穆谱参数,通过对金伯利岩中三个世代铬尖晶石穆谱研究发现穆谱参数同成份,结晶条件具有一定的内在联系.
The three different generations Cr-spinels, taken fome kimberlites Luda area, have been studied by Mossbauer spectroscopy, electronproble and X-rays diffraction anylyse. The researches show that 1: The first and second generations Cr-spinels have small amount of Fe3+ with normal sqinel structure, the third generation Cr-spinels have large amount of Fe3+ with particle inverse spinel structure. 2. In third generation Cr-spinels, Fe3+ is partly at tetrahed site (sample 50 Cr 3) , when the Fe3+/(Fe3++ Fe2+) ratio rises to 0. 44, the Fe2+ is partly at octahedral sites. The variation pattern of Fe3+/(Fe3++Fe2+) different generation Cr-spinels have also been discussed in this paper.
