摘要
通过对凤县地区秦岭岩群变质岩系北侧分布的早古生代草滩为群火山岩系的岩石学、岩石化学和地球化学特征进行研究，表明草滩为群火山岩为高铝玄武岩－安山岩－英安岩－流纹岩组合，届亚碱性系列之钙性－钙碱性岩系，形成于造山带背景下弧后盆地拉张裂谷的构造环境。
By studying the characteristics of petrology, lithochemistry and geochemistry of volcanicseries in Caotangou group (early Paleozoic era), located in the northern rnetamorphic rock se-ries of Qinling rock group in Feng county, it is suggested that the volcanic rocks of Caotan-gou group is a high-alumina basalt-andesite-dacite rhyolite assemblage, belonging to calcium-calc-alkaline igneous of sub-alkaline series under the formation of the pull-apart rift of back-arc basin in orogenic belt setting.
出处
《陕西地质》
1998年第1期42-50,共9页
Geology of Shaanxi
关键词
草滩沟群
火山岩
形成环境
Caotangou group
volcanic rock
characteristic
formation setting
