陨石中铬尖晶石同某些铬铁矿床内铬尖晶石成分对比  

The Comparison of the Chrome Spinels Composition between Meteorites and the some Chromite Deposites

作　　者：郑新华[1] 黄耀民 Zhen Xinhua;Huang Yaomin

机构地区：[1]中国地质科学院地质研究所

出　　处：《岩矿测试》1985年第3期202-209,I0003,共9页Rock and Mineral Analysis

摘　　要：本文主要通过陨石铬尖晶石和地球某些铬铁矿床中铬尖晶石成分之间的对比,结合一些实验资料,探讨它们的形成条件,以便对地球铬铁矿成因有进一步的认识。一、试用陨石中铬尖晶石成分对地球铬尖晶石成分进行标准化。对大量陨石矿物成分的研究表明。By way of comparing the composition of meteorite chrome spinels with the chrome spinels in some chromite deposits may raise the understanding of the genesis of the earth chromite.The average composition of chondrite chrome spinel can represent that of all sort meteorites,hence it can be used as a standard for the earth chrome spinels.The characteristic of the composition of meteorite chrome spinels is related with the high ferrous medium,extremily low pressure,reducing condition,as well as undergone a very slow process of cooling and crystallization.The variation of the chemical composition of chrome spinels in the various meteorites is similar to that of the main kind of earth at a depth of about 50-1 OOKm.chromite deposits(i.g.ophiolite type and layer).The coefficient of the ferrous in the chromium end member indicates the better differentiation of the begin-ning substante.

关 键 词：铬尖晶石 陨石矿物 铬铁矿床 标准化 地球 成分 

分 类 号：P18[天文地球—天文学]