三应力状态的叠加和三角形构造应力场分析——联合构造应力场研究(Ⅲ)

SUPERPOSITION OF THREE STRESS STATES AND ANALYSIS OF TRIGONAL TECTONIC STRESS FIELDS——Research on combined tectonic stress-fields(Ⅲ)

在复杂构造动力作用下,地壳内一点的应力状态可视为两个、三个或多个应力状态的叠加。作者已详细研究过两个应力状态的叠加问题,该文继续研究三个应力状态的叠加问题,并应用于分析三角形块体的构造组合型式及其构造应力场。

The stress-states at a point in the earth's crust can be considered to be superposition of two,three or more stress-states, under complex tectonic dynamic action. The author has made an exhaustive study for the superposition of two stress-states and will procceed to the superposition of three stressstates in this paper. The trigonal block is one of the main tectonic block-forms in the crust. These blocks have some complicated and some particular structural association-patterns, caused by two or three systems of external forces, acting on them at the same time. The tectonic stress-fields of the trigonal blocks and relevant combined tectonic patterns are interpreted by superposition of stress-fields. Thus, a new theory and a new method for analysing regional structure are advanced in this paper.