大陆构造系统动力学及构造应力叠加场探讨

SYSTEM-DYNAMICS AND SUPERPOSED STRFSS FIELD OF CONTINENTAL TECTONICS

从＂系统动力学＂的角度，对大陆构造动力学系统的结构、组成和特性进行了初步探讨，并且指出大陆区域构造应力场是多种因素联合作用的结果，是多种内、外力的非线性动态叠加场，大陆构造应力叠加场的主要成分包括重应力场、热应力场、离心惯性应力场、板块互相作用应力场、壳幔相变应力场、地幔流剪切应力场和其他诸如地幔底辟、岩浆侵入等造成的应力场等。并以亚洲东北部中新生代断陷盆地系的形成演化为例，试图说明在大陆构造动力学系统内，各种因素总是以其固有的规律演化着，并且相互作用，相互叠加，甚至相互转化，导致构造应力场的多次转化，推动一场又一场不同方式、不同方向和不同性质的构造运动，使中国大陆区域出现纷繁复杂的构造图象，铸成了特有的山川盆湖的分布格局。大陆构造系统动力学与现有的各种大地构造学的有机结合，可能导致＂系统大地构造学＂的发生和发展。

The structures, components and characteristics of dynamic system for continental structures are studied by employing the concepts and methods in systematic dynamics. The regional continental tectonic stress field is a dynamic nonlinear superposed field of combinative internal and external force factors, and consists of gravity field, thermal stress field, centrifugal-inertia stress field, and stress fields resulted from interaction among plates, facies change between crust and mantle, mantle convection, mantle diapirism and magma intrusion. This paper attempts to demonstrate, taking the formation and evolution of Meso-Cenozoic fault basin system in Northeastern Asia as an example, that various geologic pro cesses in continental tectonic dynamic system have their inherent evolutionary regularities, and interact,superpose and even transform each other, resulting in the multistage transformations of tectonic stress field. It is the long-term process and multistage transformations of the continental tectonic stress field that result in polyphase tectonic movements different in pattern, direction and character, and form the complicated structural frameworks and unique morphological landscape units in China.