摘要
右江裂谷带的西缘,广西那坡地区早三叠世有一套基性熔岩。本文从矿物成分、岩石结构构造、岩石化学特征等方面,论证了这套基性熔岩,主要是玄武岩,部分为细碧质玄武岩,并有淬碎玄武岩和淬碎橙玄玻璃。从化学成分与微量元素含量判断,这些玄武岩部分为钙碱质,部分为弱碱质;属“板内玄武岩”,为右江裂谷岩浆活动的产物。
There are Early Triassic basic lavas in Napo, Guangxi, on thewestern rim of the Youjiang Rift Zone.According to mineral componentsand texture, structure and chemical compositions of rock, this paperproved that these basic lavas were mainly basalts and partially spiliticbasalts with some quenching-shatter basalts and palagonites. On thebasis of chemical compositions and trace elements ones of these basaltsin this area are calc-alkalic and others are weak-alkalic. They allbelong to the 'intiaplate basalt' and were produced as a result ofmagmatiom in the Youjiang Rift.
基金
中国科学院科学基金(84)地准字第023号项目
关键词
玄武岩
早三叠世
大陆裂谷
右江
basalt
Early Triassic
continental rift
Youjiang
