摘要
运用地球化学理论和方法对南华北中生代火山岩研究后得知：火山岩的岩石类型为安山玄武岩、安山岩、英安岩、流纹岩类，为碱钙性和碱性，高钾，稀土总量高，富轻稀土；火山岩的形成构造环境既不是板块俯冲碰撞，也不是裂谷作用；火山岩形成于板块俯冲碰撞期后．与地幔柱活动有关；在白垩纪，合肥盆地和周口盆地的形成大地构造环境应是与岩石圈的热伸展有关。构造格局由地幔柱活动一伸展热窿作用（140～85Ma）所主导，空间上各单元组成热窿核剥离断裂带一下滑系统配置样式，盆地形成于下滑系统．盆地类型为前渊盆地。
Volcanic rocks have been studied with geochemical theory and method in Mesozoic, the southern North China. The rock types include andesite-basalt, andesite, dacite, liparite which are calic-alkalic and alkalic, high-K, high-∑REE and rich in LREE. The forming tectonic environment of volcanic rocks is not related to plate subduction-collision or rifting, but mantle plume after plate subduction-collision. The forming tectonic environment of Hefei and Zhoukou is related to thermo-extension. The tectonic framework is controlled by mantle plume action（140-85 Ma）. The space style of tectonic unites is composed of thermal dome-detachment fault-sliding system. The basin is formed in sliding system and the basin type is foredeep.
出处
《石油实验地质》
CAS
CSCD
北大核心
2006年第1期1-7,共7页
Petroleum Geology & Experiment
基金
中国石化科技开发项目(P02071)
关键词
地球化学
地幔柱
火山岩
前渊盆地
大别山
南华北
geochemistry
mantle plume
volcanic rock
foredeep basin
the Dabie mountains
the southern North China
