北京西山南大寨逆冲推覆构造的初步研究

南大寨逆冲推覆构造,为推土机式的双重逆冲构造。它的主干逆冲断系及其间断夹块,一起构成背形叠置双冲式;主逆冲岩席及断夹块叠在一起形成推覆体堆,如同一个推土机沿底冲断面向前位移,致使主断面下盘出现由一系列次级逆冲断层域交织而围限的透镜状断片域,类似于推土机前侧的堆积区,称为前积带。南大寨逆冲推覆构造的这种总体结构特征,可以与Boyer和Elliott所提出的理想冲断带模型相对比。

A Preliminary Study of the Nandazhai Thrust-Nappe, Western Hill, Beijing

The Nandazhai Thrust-Nappe is a duplex, of which the movement mechanism is similar to a bulldozer. Its dominant thrust systems and horses among them constitute an antiformal stacking duplex. Its dominant thrust sheet and horses were stacked into a napp(?)-pile, which moved along floor thrust and formed an anastomasing domain structure cut by second thrusts in its footwall ,called prc-piling zone, similar to the piling area in front of the bulldozer. The overal geometric feature of the Nandazhai thrust-Nappe can be compared with idealized sketch or thrust belt proposed by Boyer and Elliott(1982)