龙门山北段推覆构造的几何特征及应变分析

对四川龙门山北段推覆构造已有大量的分析和研究，但缺乏详细而确切的几何学划分以及定量阐述，本文依据对伸展断层、铲状断层的确定以及块体构造样式的研究，详细厘定该区推构造的几何学，同时，采用三维应用分析，平衡剖面等手段，阐述了推构造运动方向，迁移距离，成生顺序，成因机制及形成时代等诸问题，还指出了龙门山冒地槽的建造环境对推格局所起的重要控制作用。

GEOMETRICAL CHARACTERISTICS AND STRAIN ANALYSIS OF NAPPE STRUCT URES IN THE NORTHERN SECTION OF LONGMENSHAN

This article aims to unravel the geometry of nappe structure in the north section of Longmenshan through the detailed study of shovel like faults and detachment thrusts as well as structural pattern of the mass in the area.The movement direction,movement distance,sequence of generation,cause and time of formation are analysized by means of balanced section and three dimensional strain analysis.Meanwhile,implication that early sedimentary phase contributed greatly to the late formation of nappe structures is made.