摘要
华北陆块南缘（河南段）出露的富碱侵入岩类集中分布于卢氏－确山一线。岩石类型主要分为三大类：①碱性岩类，即含有似长石或碱性暗色矿物的正长岩类；②碱性花岗岩类，包括钠铁闪石花岗岩以及孪生的钾长花岗岩类；③石英正长岩类，包括碱性长石为主的石英正长岩、英碱正长岩和花岗正长（斑）岩类。在空间上构成一条富碱岩浆岩带，据岩石组合自北而南划为三个亚带：北部碱性岩亚带、中部碱性花岗岩类亚带和南部石英正长（斑）岩亚带。在形成时间上富碱岩浆活动集中于晚元古代末期（７００Ｍａ±）和海西晚期（３００Ｍａ±）。
The alkaline rich intrusive rocks outcropped in the south margin of North China landmass(Henan section)concentrically distributing Lushi-Queshan belt.The types of rocks can be divided into three main types:①The alkaline rock type,that is syenitoid containing foid or alkaline dark minerals;②The alkaline granitoid including arfvedsonite granite and assemblage moyite;③quartz syenite including quartz syenite,nordmarkite and granosyenite(prophyry),which took akaline feldspare as the dominate factors,all these rocks consist an akaline rich magmafic rock belt in space,they can be divided into three subzones according to the rock association from north to south:the northern subzone of alkaline rock,middle subzone of alkaline granitoid and southern subzone of quartz syenite(porphyry).The alkaline magmatic activity concentrated in the later Late Proterozoic(700Ma±)and Late Hercynian(300Ma±).
出处
《河南地质》
1996年第4期263-271,共9页
Henan Geology
关键词
侵入岩
岩石组合
时空分布
华北陆块
alkaline rock,alkaline rich intrusive rocks,North China landmass
