喜马拉雅碰撞造山带的深层动力过程与陆─陆碰撞新模型
|
摘要
青藏高原的整体隆升与地壳短缩和其增厚的物理-力学机制是该区深部物质与能量交换，圈、层结构与物质运移及其耦合的产物．印度板块与欧亚板块碰撞的前缘─-喜马拉雅碰撞造山带错综的深层动力过程是本质．基于地震Rayleigh波三维速度结构和人工源深部地震探测结果，发现雅鲁藏布江南北两侧深部构造和地球物理场差异显著，并具有特异的深层动力过程．提出了印度板块地壳和上地幔物质向北"挺进"，分别在不同档体阻隔作用下而终止于不同部位的双层"楔板"新模式，在南、北双向挤压力系作用下形成了喜马拉雅碰撞造山带和青藏高原隆升的复杂格局．
Qinghai-Xizang plateau lefting and the physical and dynamical mechanism of shortening and thickening are resulted from matter and energy exchanging, as well as matter movement and couple. To study Himalayan orogens which lie on the front of collision region of india and Eurasian plate is key for understanding the deep internal dynamical processes. In this paper, according to the data from 3D velocity structure of Rayleigh wave deep seismic sounding, the geophysical field and the deep structure on two blanks of Yalung Zangbo river have obvious difference, and there is a special deep internal dynaxnical processes. Accordingly, and new model of two layer "wedge pithes" is put forward, that is, crust and uppermantle matter of india plate move toward south and are blocked by various tectonic bodies, finally stopped on different place and depth. At the same time, under two-way compresive action of North and south, a complicate tectonic pattern of up-to-data Himalayan orogens and Qinghai-Xizang plateau lefting is formed.
Qinghai-Xizang plateau lefting and the physical and dynamical mechanism of shortening and thickening are resulted from matter and energy exchanging, as well as matter movement and couple. To study Himalayan orogens which lie on the front of collision region of india and Eurasian plate is key for understanding the deep internal dynamical processes. In this paper, according to the data from 3D velocity structure of Rayleigh wave deep seismic sounding, the geophysical field and the deep structure on two blanks of Yalung Zangbo river have obvious difference, and there is a special deep internal dynaxnical processes. Accordingly, and new model of two layer "wedge pithes" is put forward, that is, crust and uppermantle matter of india plate move toward south and are blocked by various tectonic bodies, finally stopped on different place and depth. At the same time, under two-way compresive action of North and south, a complicate tectonic pattern of up-to-data Himalayan orogens and Qinghai-Xizang plateau lefting is formed.
引文
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心