摘要
报道并描述了大别地块东南部几种新的非镁铁质超高压变质岩石,这些岩石的存在为区域规模的超高压变质作用提供了颇具说服力的证据。
The coesite eclogite is well known in the south part of the Dabie massif. According to the resent study several new crustal ultrahigh-pressure metamorphic rocks including garnet-phengite schist,garnet-jadaite quartzite and omphacite marble are discovered in country rocks,and a large amount of diopside(or amphibole)+ plagioclase pseudomorphs after omphacite and biotite+plagioclase±quartz pseudomorphs after phengite are also found in common gneisses and marbles. This convincing petrlogical evidence suggests that regional ultrahigh-pressure metamorphism may have occurred in this district. However, as most of those non-mafic rocks were transformed to low pressure mineral assemblages during the uplift prooes,their ultrahigh-pressure metamorphic history has almost been obliterated.
基金
国家自然科学基金
关键词
大别地块
非镁铁质
变质岩
Non-mafic ultrahigh-pressure metamorphism
retrograde metamorphism
the Dabie massif