摘要
运用构造岩石地层学研究方法,分析探讨了北淮阳构造带前中生代构造地层单元组成及其可能的形成环境。研究表明:北淮阳带主体发育两套前中生代岩石地层单元,即震旦-泥盆纪裂陷-洋盆阶段火山-碎屑岩组成的类复理石地层单元,石炭-二叠纪残余洋盆阶段含煤碎屑岩组成的类磨拉石地层单元;前者主要包括角闪岩相-绿片岩相变质的卢镇关群-佛子岭群及其相当层系,原岩建造主体代表了震旦-泥盆纪秦岭-大别洋盆近邻北淮阳俯冲带前缘的类复理石沉积环境;后者指低绿片岩相轻微变质的梅山群和杨山群及其相当层系,原岩建造主体代表了石炭-二叠纪秦岭-大别残余洋盆东延至北淮阳区带的滨浅海相类磨拉石沉积环境。
The basic facts of NorthHuaiyang belt (NHB) are that it is composed of two distinct PreMesozoic TectonoLithostratigraphic Units.The lower unit presents a SinianEarly PaleozoicDevonian succession called Foziling Group and Luzhenguan Group,which consists of marine quasiflysch depositional sequences developed at the forearc marine basin.The upper unit is made up of a Late Paleozoic succession named Meishan Group and Yangshan Group,which consists of coalbearing quasimolasse depositional sequences developed in littoral and continentalmarine transitional environments,belonging to the east part of QinlingDabie residual oceanic basin.All these demonstrate the fundamental composition and tectonic evolution of NHB in the stage of a plate tectonic regime during SinianEarly PaleozoicDevonian.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第5期595-598,共4页
Journal of Northwest University（Natural Science Edition）
基金
胜利油田博士后基金资助项目(00SLB26)
西北大学科研基金资助项目(00NW31)
关键词
北淮阳构造带
构造地层单元
类复理石
类磨拉石
构造演化
North-Huaiyang belt
tectono-stratigraphic unit
quasi-flysch
quasi-molasse
tectonic evolution
