摘要
通过对球粒陨石的静态高压淬火实验和人工动态高压实验的研究和综合分析,以及对在太空中经受过撞击的随州陨石中矿物发生高压相变的研究,查明了自然界的冲击事件,如星体的相互碰撞和陨石对地球表面的撞击中,矿物发生相变的P-T条件与人工冲击波实验的结果并不一致,而与静态高压淬火实验的结果相似,即前者类似静态高压淬火实验,保压时间较长,能产生高压矿物,后者保压时间极短,无高压矿物形成。因此,能够用静态高压淬火实验的结果来推定天然冲击事件中矿物的P-T历史。
The study and comprehensive analysis of static high-pressure quenching experiments and laboratory dynamic high-pressure experiments on chondrites,as well as the study of shock-induced phase transition of minerals in the Suizhou meteorite revealed that the P-T conditions for phase transition of minerals during natural impact events ,such as collision of cosmic bodies or impact of meteorites on the Earth＇s surface,are not consistent with those obtained by shock experiments on chondrites or rocks in laboratory,but can be compared with the results of static highpressure experiments. The duration of high-pressure regime for natural impact events is long enough for phase transition of minerals ,while that for shock experiments in laboratory is too short to form high-pressure mineral phases. Hence,it is reasonable to estimate the P-T history of natural impact events on the basis of phase diagrams obtained by static high-pressure quenching experiments on meteorites or rocks.
出处
《矿物岩石》
CAS
CSCD
北大核心
2005年第3期2-8,共7页
Mineralogy and Petrology
关键词
静态高压
动态高压
地幔矿物
球粒陨石
矿物相变
static high pressure
dynamic high pressure
mantle mineral
chondrite
phase transition
