大兴安岭根河岩区晚侏罗世火山岩特征及构造环境探讨  

Discussion on the characteristic and structural environmental of the late Jurassic volcanic rock in Genhe terrain, Daxinganlingu

作　　者：刘俊杰[1] 鞠文信[1] 赵九峰[2] 张海平[1] 柳永正 殷建成[1] 

机构地区：[1]内蒙古自治区地质调查院,呼和浩特010020 [2]内蒙古国土资源勘查开发院,呼和浩特010020

出　　处：《华南地质与矿产》2006年第1期38-46,共9页Geology and Mineral Resources of South China

基　　金：中国地质调查局1:25万区域地质调查项目(200213000023;1991300008041;200213000024)

摘　　要：大兴安岭根河岩区晚侏罗世火山岩岩石类型主要为火山熔岩及火山碎屑岩。据岩石化学成分火山岩可划分为流纹质、安山质、英安质及粗面质几种类型,并属高钾钙碱性系列。岩石化学、地球化学显示岩浆主要来源于下地壳,并有幔源物质参与;岩石具火山弧的特点,形成于整体挤压大陆边缘并靠近板内一侧的构造环境。The main rocks types of the late Jurassic volcanic rocks in Genhe terrain, Daxinganlin are volcanic lava and volcanic rubbishy rocks. According to the rocks chemical ingredients, they can be divided into some types, such as fluid texture fabric, andsite, Carboniferous dacitic, rough fabric and so on. All of them belong to the potassium, calcic and alkaline series. In light of the litho-chemistry and the geochemistry studying, the magma originates primarily the lower crust. This is because the parts of the lower crust melt and the drapery source material involve. In consequence, the rocks have the hallmark of the volcanic arc. And the formative reason is that they are compressed wholly by the active continental margin, which is the tectonic setting near the borderland and located at the flank inside of continent plate.

关 键 词：晚侏罗世 陆缘弧火山岩 活动大陆边缘 

分 类 号：P588.142[天文地球—岩石学]