二连浩特艾力格庙地区蓝片岩相岩石的发现及其构造意义  

The discovery of blueschist-facies rock in Airgin Sum area, Erenhot, Inner Mongolia and its tectonic significance

作　　者：李瑞彪[1] 徐备[1] 赵盼[1] 童勤龙[2] 张晋瑞[1] 

机构地区：[1]造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京100871 [2]核工业北京地质研究院,遥感信息与图像分析技术国家重点实验室,北京100029

出　　处：《科学通报》2014年第1期66-71,共6页Chinese Science Bulletin

基　　金：国家重点基础研究发展计划(2013CB429800);国家自然科学基金(40872145;40821002)资助

摘　　要：在二连浩特艾力格庙地区的古生代混杂岩带内发现了蓝片岩相岩石.矿物化学成分分析表明,岩石中的角闪石有钠-钙质和钠质两类:前者为镁红闪石、蓝透闪石和冻蓝闪石,后者为镁-钠闪石.蓝片岩相变质作用的温度约为400～450℃,压力约为0.7～1.0 GPa.研究区蓝片岩相岩石的发现表明内蒙古中部双冲碰撞造山带的北带可向西延伸约200 km,也表明华北板块与南蒙微大陆之间的缝合带位于艾力格庙到苏尼特左旗南一线.Blueschist has been discovered in m61ange of the early-middle Paleozoic Orogenic Belt in Airgin Sum area, Erenhot. Mineral chemistry analysis reveals that the blue-amphibole belongs to sodic-calcic and sodic amphiboles in this rock. The sodic-calcic amphibole can be divided into magnesiokatophorite, winchite and barroisite, while all the sodic amphiboles are magnesioriebeckite. Our research indicates that the temperature and pressure of blueschist-facies metamorphism were about 400-450℃and 0.7-1.0 GPa, respectively, which suggests a high-pressure, low-temperature metamorphic condition. The discovery of the blueschist-facies rock indicates that the early-middle Paleozoic Orogenic Belt extends 200 km to the west and the suture between North China Plate and South Mongolia Microcontinent is located from Airgin Sum to Sunid Zuoqi.

关 键 词：蓝肯岩枢岩石 艾力格庙地区 早-中古生代造山带 

分 类 号：P542[天文地球—构造地质学]