天然产出微细高压相矿物的TEM研究

Use of TEM for Studying Mineral Phases in Naturally Shocked Meteorites

本文应用透射电子显微镜(TEM)对随州陨石冲击微脉中的高压矿物进行形态观察和电子衍射分析,发现了多晶集合体形态为林伍德石(橄榄石高压多型)、镁方铁矿、镁铁—镁铝榴石(Majorite-pyrope,辉石的高压多形)、细晶林伍德石等,这些高压相矿物的存在可推算出随州陨石熔脉内矿物所受的压力、温度,同时还说明随州陨石熔脉内高压状态的保持时间应较长(数秒钟),这样才能使硅酸盐矿物在高压下进行固态相转变或从熔体中结晶出。这些研究结果对于探索地球深部物质组成及物质冲击相变有着重要意义。

This paper studies shape of high-pressure phase mineral in naturally shocked meteorites using micro-mine ralogical techniques-TEM, During the studies, the author has found some new high-pressure minerals and assemblages in naturally shocked meteorites. And these deform high-pressure phase indicated in naturally shocked meteorites having some especial conditions, which can form new high-pressure minerals and assemblages, and at the same time we also can calculate press and temperature of high-pressure phase mineral in naturally shocked meteorites. These results are very essential to explore inner compose of the deep earth and shock metamorphism.