亚洲中东部地幔涡旋对流与“涡旋/网络”大陆动力学模型

MANTLE VORTEX CONVECTION IN CENTRAL EASTERN ASIA AND THE “VORTEX/NETWORK” CONTINENTAL DYNAMICS MODEL

根据地震的涡旋状分布图象和大型盆地的分布特征，指出中东亚地区存在着巨型的涡旋构造。该涡旋构造由主环（直径约２０００ｋｍ）及内、外分支构成，主环和内环绕四川盆地逆时针旋转，外分支环绕塔里木等大型盆地顺时针旋转。根据层析成像资料推测，上述涡旋构造是上升型地幔涡旋对岩石圈板块底界驱动作用的结果。综合地幔涡旋和岩石圈下层塑性流动网络的见解，提出了“涡旋／网络”大陆动力学模型。该模型认为来自地幔涡旋的板块底界驱动力和由岩石圈塑性流动网络传递的板块边缘驱动力，作为两种基本的驱动力源，控制着中东亚大陆的构造变形及地震活动。

It is suggested on the basis of the vortical seismicity pattern and the distribution of large scale basins that a giant vortex tectonics exists in central eastern Asia, which is composed of the principal ring with diameter of about 2 000km and some inner and outer branches, and the seismic activities migrate wavily along the vortex ring belts showing the propagation of vortex waves. The principal and inner rings rotate counter clockwise surrounding the Sichuan basin and the outer branches clockwise surrounding some large scale basins such as the Tarim basin. The evidence from seismic tomography indicates that the vortex tectonics is a consequence of the effect of upward mantle vortex on the base of lithospheric plate. The plate base driving force resulting from mantle vortex and the plate boundary driving force transmitted by plastic flow network, as two basic sources of driving forces, control the tectonic deformation and seismicities in the central eastern Asian continent. The “Vortex/Network” (Vor/Net) continental dynamic model provides a new approach to the studies of intraplate deformation, seismicity, and other geological geophysical processes.