推覆体的几何学与四川龙门山推覆体模式

本文根据四川灌县、江油地区龙门山推覆体构造带的观察,结合国内外资料讨论推覆体的几何学特征和几何分类。作者首先根据推覆体沿主断层倾斜面顺向下滑和逆向上冲运动的性质,将推覆体划分为下滑推覆体和上冲推覆体两种基本类型;然后,根据推覆体与结晶岩体几何学的关系,并结合其与主断层面相对运动的性质又划分为单侧式推覆体和双侧式推覆体两大类和几个小类。作者从推覆体的发生、发展和演化过程探讨四川龙门山中北段推覆体模式。归类是初步的。在这些归类和龙门山推覆体模式分析中,对今后探索地壳上层滑脱构造的形成,模拟与这类构造有关的油气田区域是今后研究的努力方向。

Geometry of Nappes and the Pattern of Longmen Mountain Nappe, Sichuan

In this article,we have discussed the geometrical characteristics and the classification of the nappes, from observations on the zone of nappe structures Longmen Mountain,Guanxian Jiangyou region, Sichuan, in conjunction with homeabroad data. First of all,we classify the nappes into two basic types as downslide and upslide, according to movement features on major fault plane along which the nappes slide down and slide up as well. And then we divide them into the broad two fold classifications,single sided type and double side, also a few small-branches, on the basis of relationship between nappes and geometry of crystalline rock bodies,related to nappes relative movement features of major fault plane. The writer have discussed the nappes pattern of middle-north segment of Longmen Mountain, sichuan from processes of the nappe happening, developing and evolving. classification is Preliminary. Those classifications and pattern analysis are our orientation to study for further researches on the formation of the detachment structures of the upper Layer of the crust and its model field of oil gas, related to this type of structures.