摘要
凭祥逆冲推覆构造是广西境内首次在上古生界地台盖层中发现的大型叠瓦状逆冲推覆构造．长度＞３０ｋｍ，总体走向２５°～４０°，断面倾向南东，倾角２０°～３０°，逆冲方向３０７°～３１０°，分带特征明显．经平衡剖面复原计算其缩短率 ｅ＝－３３．３％，相对长度比εγ＝６６．７％，推覆距离＞５６００．形成时代为印支－燕山 期，属前展式板内隆缘型逆冲推覆构造，形成模式为冲断－推覆成因．该构造的发现对认识桂西－桂西南地区的地质构造演化与金矿找矿都具有重要意义。
Pingxiang nappe is a larg-scale imbricated overthrust structure recently and firstly found in Upper-paleozoic platform cover in Guangxi Autonomous Region. The nappe, at least 30km long. generally strikes 25°- 40° , dips to south-east at 20°-30 °, and overthrusts at a directinn of 307° - 310° .It is calculated by profile-balancing method that its e=-33.3%shortening, the relative length ratio εγ=66.7%, and the dislocation distance is at least 5600m The nappe, which is clearly zonated and belongs to the intra-plate and uplift-marginal frontal-propagation type, was formed from Indo-China orogeny to Yanshan orogeny in the way of thrust-napping. It is believed that the finding of the nappe would be very significant for the study of the tectonic evolution of west and south-west Guangxi Region, and the prospection of gold deposits in the area.
出处
《桂林工学院学报》
1996年第4期329-337,共9页
Journal of Guilin University of Technology
关键词
推覆构造
平衡剖面
应变分析
动力学分析
广西
Nappe
profile-balancing
strain analyis
dynamic analysis
Pingxing
Guangxi
