摘要
闽西地区的早中生代逆冲推覆构造由３个基本构造单元组成：西部结晶基底仰冲带、中部活化基底剪切滑脱带和东部盖层褶皱冲断带。古构造应力测定表明由西向东应力值依次递减。利用层长守恒原理，估算出的逆冲作用所造成的地壳缩短率至少达４５％，缩短量近１２０ｋｍ。逆冲推覆总体受华夏古陆基底构造作用的控制。乃华夏古陆西北边缘指向南东逆冲带的一部分。与扬子地台东南边缘指向北西的前陆边缘的褶皱冲断带一起。
The early Mesozoic thrust nappe structure in western Fujian is composed of three basic tectonic units:the crystalline basement obduction zone in the central part and the cover fold thrust zone in the east.Paleotectonic stress measurements indicate that the stress values decrease from west to east.By using the principle of layer length conservation,the rate of crustal shortening resulting from thrusting has been estimated to be at least 45% with a shortening amount of nearly 120km.The thrust nappe as a whole was controlled by the tectonism of the basement of Cathaysia and constitutes a part of the southeast vergent thrust belt on the northwestern margin of Cathaysia.It combines with the northwest vergent foreland margin fold thrust belt on the southeastern margin of the Yangtze platform to form the early Mesozoic South China deflected symmetric fan shaped thrust orogenic belt.
出处
《中国区域地质》
CSCD
1996年第4期335-343,共9页
Regional Geology of China
基金
国家教委博士点基金
