恒山变质岩区晚太古宙地质事件序列及其地壳演化意义  

THE LATE ARCHEAN GEOLOGICAL EVENTS SERIES OF THEHENGSHAN METAMORPHIC TERRAIN AND ITS SIGNIFICANCEFOR CRUSTAL EVOLUTION

作　　者：李江海[1] 钱祥麟[1] 

机构地区：[1]中国科学院地质研究所,北京大学地质学系

出　　处：《中国区域地质》1995年第1期36-43,共8页Regional Geology of China

基　　金：国家自然科学基金资助项目

摘　　要：详细的构造－岩性填图研究表明，恒山变质岩区存在五台群的基底杂岩，该区晚太古代一早元古宙经历了表壳岩形成－深成岩体侵位事件，并且涉及多期构造变形（褶皱、剪切作用）与变质。其中，大规模近水平剪切变形造成基底杂岩的不同单位构造叠置和重熔。地质事件序列记录了恒山地区早前寒武纪陆壳生长、分异的克拉通化过程及大陆裂谷作用。Detailed structural-lithologic mapping in typical sectors of the Hengshan metamorphicterrain indicates that there exist basement compleses of the Archean Wutai Group in the ter-rain. During the Late Archean to Early Proterozoic the terrain undrwent the event of formationof supracrustal sequences and emplacement of plutons and polyphase structural deformauon(folding and shearing) and metamorphism. Among other things, large- scale subhorizontalshearing resulted in superimposition of different structural units and anatexis of basement com-plexes. Geological events series recorded accretion, differentiation and finally cratonization ofthe continental crust and subsequent continental rifiting in the Early Precambrian in the Heng-shan area.

关 键 词：变质岩区 太古宙 地质事件 地壳 演化 

分 类 号：P553[天文地球—构造地质学]