摘要
冀东太古宙高级区主要由两个构造单元组成，以三屯营－洒河－金厂峪一线为界，北西侧为线性构造区，南东侧为卵形构造区。卵形构造是由紫苏花岗岩固态气球膨胀侵位形成的，之后又受到深部构造相韧性变形带的叠加，使卵形构造由东到西受改造的程度逐渐增大。线性构造则是中部构造相韧性变形带对深部构造相和卵形构造叠加的结果。尽管冀东地区南东、北西分异早于３５６３Ｍａ，但卵形构造区和线性构造区出现相对较晚（２５００Ｍａ）。
According to differences of geological feature,Arcbaean high-grademetamorphic terrane in eastern Hebei province can be divided into two tectonic units:1 )linear zone in the west,and 2)oval region in the east.Field evidences suggest that thetectonic ovals are main products of the soridity to semi-solidity ballooning diapir ofplutons. The shape of ovals is longer in the west and shorter in the east,which is due tosuperimposition of ductile deformation zone(DDZ)of deep tectonic facies (DTF).Thelinear tectonic zone,exhibited as tectono-metamorphic compex zone is produced by theDDZ of medium tectonic facies. The presentIon of the linear zone and oval region isrelatively late,but the differentiation of the east and the west is earlier than 3563 Ma.
关键词
太古宙
变质区
构造演化
冀东
tectonic oval region,linear tectonic zone,tectonic facies,ductiledeformation zone,eastern Hebei
