欧亚板块均衡大地水准面异常及其动力学特征  

Isostatic geoid anomalies of Eurasia plate and its geodynamical feature

作　　者：宋世荣[1] 卢贵清 方剑[3] 

机构地区：[1]中南冶金地质研究所,宜昌443003 [2]武汉科岛地理信息工程有限责任公司,武汉430081 [3]中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,武汉430077

出　　处：《地球物理学进展》2017年第3期1029-1033,共5页Progress in Geophysics

基　　金：国家重点研发计划(2016YFC0601101);中国科学院战略性先导科技专项(XDB18010304)联合资助

摘　　要：采用弹性挠曲模型,利用球谐函数方法计算了欧亚板块均衡大地水准面异常.均衡大地水准面异常消除了地形起伏、地壳物质补偿的影响,主要反映了地幔物质密度异常以及核幔边界起伏和热状态的不均匀分布特征,而这种物质密度和热状态的不均匀分布导致了地幔物质的流动.针对滤波后的均衡大地水准面异常分别计算了欧亚板块大尺度和中尺度的地幔对流,并进行了构造和地球动力学分析.结果表明,现今欧亚板块的地壳运动与地幔对流有着密切的联系.According the elastic flexural model, we calculated Eurasian plate isostatic geoid anomaly by using spherical harmonic function method. Isostatic geoid anomaly eliminates the influence of topography,crustal compensation,mainly reflecting the undulation of the core mantle boundary and mantle density and uneven distribution of the thermal state. And the mantle material density and thermal state inhomogeneous distribution resulted mantle convection. According to the filtered isostatic geoid anomalies,mantle convections of Eurasian plate are calculated in middle and large scale. Then we analyzed the structure and dynamics of the earth. The results show that the recent crustal movement of Eurasian plate is closely related to mantle convection.

关 键 词：欧亚板块 均衡 大地水准面异常 地幔对流 动力学 

分 类 号：P541[天文地球—构造地质学]