北京房山北岭向斜形成与形变综合解析

弯月状北岭向斜是北京房山周口店地区的主体构造形迹，也是一个非常特殊的构造现象。它的原型是晚古生代和侏罗纪两套陆相盆地叠加而成的复合盆地，其特征与整体华北板块的构造演化一致；而其晚期(燕山期）的褶皱变形是由于房山花岗闪长岩体侵位造成的局部动力作用结果。特别是不同于教科书中所讲的褶皱形成机制和构造叠加的一般概念。当我们采用系统论即整体论的思考方式会将一般看来互不相关的局部构造细节联系起来思考，其成因就会迎刃而解。再有，由于这里的地质构造与地层建造、岩浆活动、变质作用等构成相关的复杂系统，因此必须采用综合构造解析，才可能对北岭向斜的形成与形变的复杂过程获得较全面的理解。

Synthetical Analyses of the Formation and Deformation of the Beiling Syncline in Fangshan,Beijing

The crescent-shaped Beiling syncline is a main structural feature in Zhoukoudian, Beijing, reflecting a very special structural deformation. Originally, it was only the superimposition of a Late Paleozoic continental basin and a Jurassic continental basin, which responded to the tectonic evolution of the North China Plate, but then it experienced the Yanshan Period fold deformation due to the local stress field produced by the Fangshan granodiorite emplacement. The formation process of the syncline is different from what is told about either fold mechanism or tectonic superimposition in general textbooks. This syncline actually occurred in a complicated system which involved deposition, deformation, magmatism, and metamorphism. Therefore, its origin can be better understood only through the thinking line of system theory, that is, by seeing local and seemingly unrelated structural details as parts of a system.