摘要
华北板块与扬子板块经海西－印支期Ｂ型俯冲与碰撞敛合形成东秦岭复合山链后，构造变动并未结束，随之发生的是Ａ型俯冲和巨型滑脱推覆。文章依据地表地质及更能清楚地反映地壳结构的二维速度资料，对东秦岭造山带的滑脱－推覆构造进行了再次研究，并建立了该区的Ａ型俯冲模式。认为东秦岭地区存在着六重拆离滑脱与数个大型推覆构造和两条巨型Ａ型俯冲带，其Ａ型俯冲模式表现为奇特的“双楔剖竹”。
Since the formation of East Qinling composite mountain chain due to B-subduction and collision between North China Plate and Yangzi Plate,tectonic movement of this region has never been still,and A-subduction and great slip-nappe has occured. On the basis of analysis of geology of the terrene and two-dimensional velocity of the earth's crust, the slip-nappe structure of East Qinling orogenic zone is studied,and a model of A-subduction of this region is suggested. It is considered that there are five or six separate-slips, several large scale nappe structures and two great A-subduction zones in this region. The A-subduction is characterized by 'two wedge cleaving bamboo'.
出处
《成都理工学院学报》
CSCD
1994年第1期1-10,共10页
Journal of Chengdu University of Technology
基金
国家自然科学基金
关键词
东秦岭
造山带
滑脱推覆
俯冲模式
East Qinling,orogenic belt,splintery slip-nappe, A-subduction model
