从亚洲S波波速结构看地幔流体运动特征

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...

Movement Features of Mantle Fluid Flows from S-wave velocity Structure of Asia

Based on recent results of S-wave seismic tomography, we analyze of overall features of the mantle S-wave velocity structures beneath Asia, which correlate with the current movement pattern of mantle heat-flows. The study concludes that the S-wave velocity structure features of the Upper Mantle can be explained by the plate tectonics. Heat accumulation occurs beneath the lithosphere of the central Eurasia superplate. A strong negative velocity disturbance exists in the mantle below Hainan Island and South China Sea that looks very much like a mantle superplume. The movement of mantle heat-fluid flows shows two different geometrical patterns: vertically growing up or side turning. The flows belonging to these two patterns are equally important and can across into each other to construct more complicate modes.