摘要
昌宁－孟连火山岩带玄武岩由碱性橄榄玄武岩、橄榄玄武岩及粗面质玄武岩组成，以碱性橄榄玄武岩为主。本文对玄武岩的矿物成分、化学成分、稀土元素等岩石学与地球化学进行详细论述，指出本区玄武岩为碱性高钾玄武岩，其大地构造环境应为大陆裂谷环境。
The basalt in Changning-Menglian volcanic rock belt is composed of the alkali olivinebasalt， the olivine basalt and the trachy basalt．This paper dicusses the characteristics of thebasalt’s petrology and geochemistry from mineralog．Petrochemistry and REE distributionpatterns,etc. It is concluded that the basalt belonged to the alkali-rich and potasium-richbasalt，which is considered to be the genesis of the continent rife valley in the geotectonic en-vironment.
基金
中国有色金属工业总公司高校科研基金
关键词
玄武岩
岩石学
地球化学
basalt；rift valleys；petrology；geochemistry
