【摘要】 褶皱—冲断带的研究对于揭示地球演化历史及指导油气勘探具有重要的理论意义和实际意义。本文以龙门山构造带为例,从几何分析入手,对该构造带的区域地质背景、构造变形特征及形成机制进行了探讨。研究表明,龙门山构造带是特提斯构造演化的产物,属于典型的前陆褶皱—冲断带,其变形特征可与世界典型的造山带进行对比。更多还原

【Abstract】 Longmen Mountain Which Lies between Yangtze terrain and Song- pan-Ganzi fold zone is a typical foreland fold-thrust belt, It was formed by the collision of Tethys in Indosinian movement. The belt can be devided into three zones due to the difference in stratig- raphy, deformation and metamorphism, i. e. Similar fold-ductile shea- ring zone, Concentric fold-imbricate thrust zone and gentle fold zone. The structural styles in this area is typical and can be com- pared with the structures in other typical fold-thrusts belt in the world. using the technique of balanced cross section, we calculate that the shortening of the belt is about 60%～70%, it has been proved to be correct by the seismic exploration,更多还原