皖南葛公镇组火山岩的发现及其特征  

THE DISCOVERY AND CHARACTERISTICS OF THE GEGONGZHEN FORMATION OF VOLCANICS IN THE SOUTH ANHUI

作　　者：吴家富[1] 孙乘云[1] 褚进海[1] 耿晓光[1] 谢建成[1] 

机构地区：[1]安徽省地质调查院,安徽合肥230001

出　　处：《安徽地质》2001年第1期24-26,共3页Geology of Anhui

摘　　要：通过１：５万官港等３幅野外地质调查，在葛公镇组发现了层状、似层状变流纹岩、变流纹质角砾熔岩等的浅变质中酸性火山岩。以流纹质为主的火山岩系是局部挤压上升陆壳增厚构造环境的产物，岩浆起源较浅。时代相当于新元古代。After three sheets of 1: 50000 geological mapping in Guangang we found stratified and stratitoid meta - rhyolitic breccia lava in the Gegongzhen Formation, which are thought to be epimetamorphic intermediate - acid volcanics. The rhyolite - dominated vol- canics of this kind are resulted from the shallowly - sourced magma in the partially compressed uplifting continental crust thickening tectonic environment in the late Proterozoic.

关 键 词：安徽 皖南葛公镇组 火山岩 岩石化学特征 地质意义 火山活动 

分 类 号：P588.14[天文地球—岩石学]