从亚洲S波波速结构看地幔流体运动特征

Movement Features of Mantle Fluid Flows based on the S-wave Velocity Structure of Asia

总结S波速度成像研究的成果,在对全球地幔对流模式分析对比的基础上,考察了亚洲地区地幔S波速结构的总体特征以及地幔流体运动的模式。认为上地幔S波速结构的总体特征总体上可以用板块构造学说来解释,亚欧超级大陆中心区地幔中有地热能量积累。海南下方地幔S波速度负异常可能反映现代地幔热羽柱,地幔热流体的运动有由下向上及倾向两种模式。两种模式可以互相穿接,具有同等的重要性。

Based on analysis and comparison of global manle convection model,this study summarized the research results of S-wave seismic tomography,and investigated the general features of mantle S-wave volicty pattern in Asia and the model of mantle fluid movement.It is generally considered that the S-wave velocity structure features of the Upper Mantle can be explained by the plate tectonics.Heat accumulation may occur in the mantle beneath the central Eurasia superplate.A strong negative velocity disturbance occurs in the mantle below the Hainan Island and South China Sea,reflecting a modern mantle-plume system.Movement of mantle heat-fluid flows shows two different geometrical patterns： upward migration and oblique migration,both of which can happen one after another or alone,and then are of equal importance.