推覆构造的地球动力学探讨

推覆构造的研究具有重要的理论和实际意义,经过对推覆构造形成的地球动力学机制进行的探讨,提出了层圈运动是地球本身运动的基本形式;层圈运动的动力来源于物质横向上的分布不均,层圈运动的必然结果是出现推覆构造体系。根据该理论,推覆构造仅仅发生于不同大地构造单元的界线附近;推覆构造的形成机制是下俯作用。从而对大陆的发生、发展及消亡提出新的见解,把用于洋壳的威尔逊旋回发展到陆壳上,提出了新的全球大地构造旋回。该文在此基础上提出了推覆构造体系这一构造模式。

A PRELIMINARY STUDY OF GEOOYNAMICS ON NAPPE TECTONICS

The study of nappe tectonics is of quite important theoretical and practical significance.The author considers that the shell-stratotype movement is a basic form of the movement of the earth itself, that the dynamic source of the shell-stratotype movement lies in the unbalance of masses distributed on the horizontal plane, and that the result of the shell-stratotype movement leads to the appearance of nappe tectonics.It is derived from this theory that nappe tectonics occur only nearby the boundaries of the different tectonic units.The mechanism of nappe tectonics is underthrust which is further divided into B-type subduction and A-type subduction.It is thought that an area will undergo the A-type subduction after having undergone the B-type subduction.A new model of nappe tectonics has been suggested in this paper.The model is called a system of nappe tectonics.Many practical problems can be explained with this model. For example, in view of this model, pull-apart and compression or compression and pull-apart are closely related to each other.The tectonic cycle of Wilson only expained the accurrence, the evolution, and the disappearence of the ocean layers. But, in fact, the continents are also of the processes of their own occurrence, evolution and disappearence. Only through the combination of these two points, will a real tectonic cycle be formed.