内蒙大青山早前寒武纪变质岩和早期陆壳的演化  

EARLY PRECAMBRIAN METAMORPHIC ROCKS AND EARLY EARTH CRUST EVOLUTION IN DAQINGSHAN, INNER MONGOLIA

作　　者：金巍[1] 李树勋[1] 刘喜山[1] 

机构地区：[1]长春地质学院地质系

出　　处：《长春地质学院学报》1992年第3期281-289,共9页

摘　　要：将大青山地区早前寒武纪变质岩石分成三个岩性构造组合.即(1)麻粒岩—紫苏花岗岩组合;(2)角闪片麻岩—英云闪长岩组合;(3)富铝片麻岩—钾质花岗岩组合.其中,组合(1)是区内最古老的物质组成,其形成时代至少应在晚太古代以前(>2800Ma).组合(2)是具花岗—绿岩带特征的晚太古代中、低级变质岩系.组合(3)是经早元古造山变质作用形成的岩石组合.根据重新排定的地质事件顺序,对本区早期地壳演化的有关问题进行了讨论.The early precambrian rocks in Daqingshan region can be divided into three lithological structural units, (1) granulite-charnockite unit; (2) hornblende gneiss-tonalite u-nite; (3) alumimum rich gneiss-kaligranite unit. Unit one is the oldest rocks in the region, which is at least older than late Archaean(>2800Ma). Unit two belongs to late Archaean middle-low grade metamorphic rocks with the characteristics of granite -greenstone belt. Unit three is the rock association formed in early proterozoic orogenic metamorphism. Accordiny to the rearranged geological event diagram, some questions about early crust evolution of this region have been discussed in this paper.

关 键 词：变质岩 陆壳 早前寒武纪 演化 

分 类 号：P588.3[天文地球—岩石学]