摘要
河南省栾川群大红口组火山岩 ,岩性以碱性粗面质熔岩为主 ,经受不同程度的区域变质、动力变质及热液变质作用。喷发类型以裂隙式为主 ,有 4个喷发韵律 ,喷发环境为浅海 ;岩石地球化学特征显示 :其碱性火山岩属钾质型 ,形成于板内裂谷环境 ,与其伴生的辉长岩为同源岩浆成因 。
The main lithology of volcanic rocks of Dahongkou formation, Luanchuan Group of Henan is alkalilc trchytic lava, which underwent different grade of regional metamorphism, dynamic and hydrothermal metamorphism. The main types of eruption was fracture, there were four erupting sequence and the eruption setting was shallow sea. The characteristics of petrogeochemistry showed that the alkalic volcanic rock belonged to patassium type which formed in intraplate rift setting and the companied gabbro was automagma gness, these all came from the product of partial melt of upper mantle and lower crust.
出处
《河南地质》
2000年第3期181-189,共9页
Henan Geology
关键词
大红口组
碱性火山岩
钾质型
板内裂谷
栾川群
Dahongkou formation
alkalic volcanic rock
patassim type
intraplate rift
melting product
