摘要
加里东运动导致了华南地区诸省泥盆系与前泥盆地层之间构造不整合。为了弄清此次运动的性质,本文首先回顾了加里东运动的相关术语,然后综合分析了华南地区志留系地层的大规模缺失、奥陶纪―志留纪界线附近古地理格局大变化、加里东期同位素年龄信息。作者认为:华南加里东运动的实质是扬子板块与华夏板块在奥陶纪末到志留纪发生的板内碰撞运动,这种碰撞导致的挤压作用使元古代地壳基底发生深熔作用,产生华南地区大面积分布的花岗质岩石和混合岩,以及变质、变形作用;同时,也是这次板内碰撞作用导致了始于晚奥陶世的华南地壳大规模抬升,从而造成华南大范围内志留系地层的缺失。
In South China,the Caledonian mountain-building movement results in the tectonic unconformity between the Devonian and pre-Devonian layers.In order to learning the origin of this movement,we firstly review its related terms in South China,and then we give an integrate analysis of the extensively stratum missing of the Silurian system,paleogeographic map change from Ordovician to Devonian,and isotopic ages of granitoid plutons in the South China region.It is suggested that the Caledonian movement can be attribute to the collision between the Yangtze block and the Huaxia block from late Ordovician to Silurian.As a result,the compression gives rise to the anatectic melting of the Proterozoic crustal basement,which results in the extensively spread of the granitoid rocks and migmatite as well as the deformation and the metamorphism.In addition,this collision also causes the crustal lifting movement in South China,which is the reason why the Silurian system misses.
出处
《科技通报》
北大核心
2012年第11期42-48,71,共8页
Bulletin of Science and Technology
基金
浙江省国土资源厅项目(编号:[省资]2010001)
关键词
加里东运动
华南志留系
古地理格局
caledonian movement
south china
lost of siluric stratum
palaeogeographic pattern
