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李四光教授于1954年提出建立祁吕贺兰山字型,并作了概括性的描述,从此被人们广泛引用。依据典型山字型的应力场,将祁吕系、贺兰褶带、阿宁盾地和鄂尔多斯盾地划归为一个构造体系之中是有着力学理论为基础的。但是,祁吕贺兰山字型两翼不对称并经历了不同的演化过程,即西翼控制着活动强烈的地槽,其后转为相对稳定的地台;而东翼控制着稳定的地台,后期出现地台“活化”现象,这是标准的山字型应力场不易解释的难题。
Professor Li Siguang proposed in 1954 to establish Qi Lu Helan Shan font, and made a general description, since then it is widely cited. Based on the stress field of a typical mountain type, the Qilu line, the Helan fold belt, the Anning shield line and the Erdos shield line are classified into a tectonic system based on the mechanics theory. However, the Qilu Helan Mountain fonts asymmetric wings and underwent a different evolution process, that is, the West Wing control of a strong activity of the trough, and later converted to a relatively stable platform; and the East Wing control of a stable platform, late Appeared on the platform “activation ” phenomenon, which is difficult to explain the standard mountain font stress field.