摘要
近年来在南极及澳大利亚、非洲和北美的沙漠地区发现和回收了大量的陨石，改变了以前的球粒陨石分类。球粒陨石群由９个增加到１３个（ＥＨ、ＥＬ、Ｈ、Ｌ、ＬＬ、Ｒ、ＣＩ、ＣＲ、ＣＨ、ＣＭ、ＣＯ、ＣＶ及ＣＫ），并提出了３个碳质球粒陨石小群。ＣＫ、ＣＲ、ＣＨ和Ｒ为１３个球粒陨石群中新的化学群。不同的球粒陨石群，其岩石学、矿物学、化学及氧同位素组成均有明显的差异。根据其结构、矿物、化学及氧同位素组成特征，将１３个球粒陨石群划分为碳质球粒陨石系（由ＣＩ－ＣＲ－ＣＨ、ＣＭ－ＣＯ及ＣＶ－ＣＫ族组成）和顽辉石－普通球粒陨石系（由ＥＨ－ＥＬ、Ｈ－Ｌ－ＬＬ及Ｒ族组成）。碳质球粒陨石系是在相对远离太阳的区域形成，它以高的氧化态为特征。
The large number of meteorites from Antarctica and the desert areas of Australia,Africa and North America changed the previous chondrite classification in recent years.The number of well established groups has increased from 9 to 13(EH,EL,H,L,LL,R,CI,CR,CH,CM,CO,CV and CK) and three new carbonaceous chondrite grouplets have been proposed. There are remarkable differences among chondrite groups in petrographic, mineralogical, chemical and O isotopic characteristics. We suggested that 13 chondrite groups can be divided into carbonaceous chondrite family consisting of CI CR CH,CM CO and CV CK clans and enstitate ordinary chondrite family consisting of EH EL, H L LL and R clans. The carbonaceous chondrites are charcterized by high oxidation state.The enstitate ordinary chondrite family formed near the Sun and in the inner solar system.
出处
《南极研究》
CSCD
1996年第1期21-36,共16页
基金
国家南极考察委员会资助
中国科学院"八五"重大基础学科资助
关键词
南极陨石
沙漠陨石
球粒陨石
陨石
s Antarctic meteorite,desert meteorite,chondrite,classification of chondrites.
