栾川群大红口组火山岩研究初探  

PRELIMINARY RESEARCHING ON THE VOLCANIC ROCK OF DAHONGKOU FORMATION, LUANCHUAN GROUP

作　　者：王跃峰 

机构地区：[1]河南省地矿厅区调队,河南平顶山467021

出　　处：《河南地质》2000年第3期181-189,共9页Henan Geology

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.

关 键 词：大红口组 碱性火山岩 钾质型 板内裂谷 栾川群 

分 类 号：P588.14[天文地球—岩石学]