【作者】 叶正仁； 王建；

【Author】 YE Zheng-Ren WANG Jian Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

【机构】 中国科学院地质与地球物理研究所；

【摘要】 运用有限元方法对中国大陆及邻区地壳与岩石圈运动进行动力学模拟.以一个黏性薄板(牛顿黏滞、非牛顿黏滞)比拟中国大陆岩石圈,通过解力平衡方程得到中国大陆地壳相对于欧亚板块的运动速度分布,并与最新观测的GPS测量资料比较.结果表明,造成中国大陆及邻区现今地壳运动及形变的主要动力来源为印度-欧亚板块碰撞及中国西部地区,特别是青藏高原的巨大重力位能.相对而言,前者的贡献大于后者.同时,构成中国大陆岩石圈的介质具有较强的非均匀流变特性,呈现出分块特征.更多还原

【Abstract】 We employ the finite element method to perform modeling for the crustal and lithospherie movement in the China mainland and its neighboring areas.In the modeling we use a viscous sheet(Newtonian and nonNewtonian) to simulate the continental lithosphere.By solving the force balance equations,we obtain the velocity field of the China continental crust with respect to the Eurasia plate and compare them with the recent GPS measurements.Our result show that the primary driving force source accounting for the crustal movement in this region is from the collision between the India and Eurasia plate as well as the huge gravity potential energy of the Qinghai-Xizang Plateau.In comparison,the contribution of the former is larger than the latter.The result also indicates that the media of the China lithosphere has a strong heterogeneity of rheology,which resuits in its block-division feature of the present-day crustal velocity field.更多还原