岩石圈流变强度与中国大陆构造运动关系的探讨  

STUDY ON RELATION BETWEEN THE VISCOSITY COEFFICIENTS OF LITHOSPHERE AND TECTONICS MOVEMENT IN CHINA

作　　者：肖兰喜[1] 朱元清[2] 陶九庆[1] 杜宪宋[1] 

机构地区：[1]山东省地震局,山东济南250014 [2]上海市地震局,上海200062

出　　处：《西北地震学报》2003年第4期304-311,共8页Northwestern Seismological Journal

摘　　要：以GPS观测资料和地震学研究成果为约束,针对不同流变参数的中国大陆岩石圈模型,数值模拟了岩石粘度与中国大陆板块边界作用强度的关系,探讨了陆 陆碰撞对中国大陆分层岩石圈运动的驱动机制.给出了陆 陆碰撞驱动力、附加地形与山根浮力及热浮力对中国大陆构造运动的驱动特点.印度板块、太平洋板块和菲律宾板块对中国大陆驱动的边界作用强度之比约是4:1.25:1,所引起的水平主压应力主要集中在坚硬岩石层;而附加地形等垂直方向作用力在水平方向产生的最大主压应力则主要集中在软弱岩石层.这种垂直方向上的作用力在高原南部地区阻碍陆 陆碰撞向北的推挤运动,在高原东北部增加对其它块体的推挤作用.Under the restriction of GPS observation data and results from seismological study,in two models of China continent lithosphere which have different viscosity coefficients,the relationship between the intensity of plate driving force on the plate boundery and the viscosity coefficients of model is numerical simulated.The geodynamic driving mechanism of continental lithosphere movement in China by the India-Eurasia plate collision is discussed.The geodynamics driving characteristics of the India-Eurasia plate collision and action forces in vertical direction, which include geopotential of Tibetan Plateau landform and buoyancy of heat convection in its upper mantle, are presented.The intensity ratio of driving force to China continental lithosphere from India plate, Pacific plate and Philippines plate is (about) 4:(1.25):1. The driving force of continental collision forms high horizontal compression stress in hard layers and the vertical force forms high horizontal compression stress in weak layers.The vertical force blocks the crustal movement to the north in the south part of Tibetan Plateau, and enhances mass extrusion in the north-east part of Plateau.

关 键 词：驱动机制 附加地形 浮力 边界条件 数值计算 

分 类 号：P313.3[天文地球—固体地球物理学] P542[天文地球—地球物理学]