亚洲深部构造及其动力学特征

“亚洲深部构造图”是《亚州陆海大地构造图》的基础图件之一.“亚洲深部构造图”给出,在不同的壳体中不同的大地构造单元,深部构造处于明显差异的状态,在不同的壳体现处于相同大地构造发展阶段的区域,深部构造状态有明显的共性。这反映不同壳体里不同、大地构造单元是地球动力学的结果.在亚洲区域深部,存在两个可能的物质流汇聚带:特提斯带和环太平洋带。存在一些可能的物质流发散中心.其中大陆区的最大发散中心位于中亚。西藏高原由于位于北面的中亚发散中心(向南)和南面的印度洋北部发散中心(向北)的深部物质池蠕动聚合,形成了独特的构造区。由于西藏深部物质流聚合以南北向为主.东亚岛弧带深部物质流聚合以东西向为主,在亚洲东部古陆上形成了东经105°左右的横桓在此洲大陆中部的南北构造带。这些特征,构成了亚洲区域的主要构造格局。

ASIA DEEP STRUCTURE AND ITS GEODYNAMIC CHARACTERISTICS

"Deep structure map or Asia" is ohe of basic figures relating to "Tectonic map of Asia continent and sea". According to the "Deep structure map of Asia", in Asia arca, the deep Structures vary laterally from every geotectonic region which belongs to different crust-bodies. But it also appears that some basic characteristics of deep structure is relating to certain evolution stage of geotectonics, although these areas belongs to different crust-bodies. It is possibly that there are two mantle creep converge zones, Tethys zone and Pecific Ocean zone developing in the deep mantle under Asia. And there are some mantle creep diverge centres distributed around these mantle creep converge zones. One of the largest mantle creep diverge centres of Asia continent is located in Central Asia, north of Tibet Plateau. Another of the largest mantle creep diverge centres is located in northern Indian Ocean, south of Tibet Plateau. As there are mainly two sources of mantle creep diverge, from Central Asia going toward the south and from northern Indian Ocean going toward the north, the Tibet Plateau has developed and is developing. Because of the directions of mantle creep, one is nearly NNE along Tethys mantle creep converge zone and the other is nearly WNW along Circum-Pacific Ocean mantle creep converge zone, in the eastern Asia continent (near longitude 102°E-105°E) a large tectonic zone striking in NS direction has developed.