摘要
内蒙古中部白云鄂博地区的早古生代弧-盆构造体系是构成南蒙古洋板块与华北板块俯冲带的重要组成部分。岛弧岩系由中下奥陶统包尔汗图群钙碱性火山岩与侵入其中的岛弧深成岩组成;弧后盆地主要由中下奥陶统呼和艾力更组石英砂岩、绿泥片岩、粉砂质板岩等组成,为一套复理石建造正常碎屑岩夹基性火山岩。而且在岛弧岩系的南侧乌德一带首次发现并确定了一条构造混杂带,它们在构造上与早古生代期间南蒙古洋板块和华北板块相互碰撞有直接的成生联系,为研究本区早古生代期间古板块构造活动提供了新的重要证据。
The arcbasin system of early Paleozoic in the central part of Baiyun'ebo is the important part of the subduction zone between Mongolia ocean plate and North China Plate. The series of island arc type rocks are composed by calc volcanics of Baoerhantu Group and deeprocks of invading it in middlelower ordaracai. The back arcbasin is a series of flysch formation made of ordinary clastic rock and basic volcanic rock. It mainly includes feldspathic quartz sandstone and chlorite and chloriteschist and silt slate etc in Huheailigeng Group. In the southern Wude, mélange zone has firstly been discovered and made sure to show the direct connection of collision between south Mongolia ocean plate and North China Plate each other. It provides the important evidence for activity of old plate at early Paleozoic in Baiyun'ebo area .
出处
《地质调查与研究》
2003年第3期160-168,共9页
Geological Survey and Research
基金
国家地质大调查项目(10101115015)
