试论旋扭构造形成的地球动力学模式——以欧亚旋扭构造体系为例

形成旋扭构造的动力可概括为五个方面:地块随着地球自转速率的变化,局部发生的旋扭;漂移在软流圈之上的地块遇到上拱的“热柱”受到局部牵制而旋扭;地幔熔融体物质对流循环产生蠕动式旋扭;岩石圈拖曳牵动引起旋扭;重力控制下密度分异所引起的水平漫流碰接于上升物质而旋转。欧亚大陆上分布着涡轮状、帚状、莲花状、连环状等各种旋扭构造。

GEODYNAMIC PATTERN OF THE VORTEX STRUCTURE -As an example on the Europe and Asia Continents

The vortex structure of lilhosphcre is a commen structural pattern. According to tne forces producing the vortex structure five kinds of vortex structure are recognized. These arc the vortex occurred in the massif caused by the variation of the earth self-rotation rate, the vortex formed as the massif drifted on the mantle met the rising hot-spot plume, the vortex formed in the squirm caused by the convcnclion circulation of the mantle melting matter, the vorlex caused by the towing of the dive zone in the lilhospherc, the vortex formed in the collison of horizontal overflow caused by the density fractiona-tion of the melting matter. On the Europe and Asia continents all these pal-terns are observed, including so-called the broom pattern, the lotus flower pattern, the chain of rings pattern, and some others.