YUAN YiZhe,
HU CaiBo,
WEI DongPing
.2021.Numerical simulation of diapir flow—Enlightenment on formation of Qilian arc in northern Qaidam in the early Paleozoic Chinese Journal of Geophysics(in Chinese),64(5): 1666-1682,doi: 10.6038/cjg2021O0314
Numerical simulation of diapir flow—Enlightenment on formation of Qilian arc in northern Qaidam in the early Paleozoic
YUAN YiZhe1,2, HU CaiBo1,2, WEI DongPing1,2
1. College of Earth and planetary Science, Universily of Chinese Academy of Sciences, Beijing 100049, China; 2. Key Laboratory of Computational Geod ymamics, Chinese Academy of Sciences, Beijing 100049, China
Abstract:The diapir flow is an important window for studying the material circulation and migration inside the Earth. Studying the dynamic evolution of the diapir flow is of great significance for us to understand the regional geological structure and evolution. In this paper, from the perspective of thermo-structural mechanics, three different numerical models are developed to study the dynamic process of diapir flow upwelling, and to analyze the influences of the diapir flow radius, thermal-structural coupling, and magma upwelling channel on diapir flow upwelling process. This study is of great significance to understand the formation process of the Qilian arc in northern Qaidam, northeastern Qinghai-Tibetan Plateau. The numerical experimental results show that the larger the diapir flow radius, the faster the diapir upwelling speed; it is difficult for a single diapir to directly ascend to the bottom of upper crust. The North Qaidam ultrahigh-pressure metamorphic zone and magmatic arc may be due to the continuous diapir flow upwelling, through stable magma channels, and the formation of magma channels has an important influence on the decompression time of ultra-high pressure metamorphic rocks and the formation time of magma arcs; During the upwelling of a single diapir with a stable magma channel from 90 km deep in the mantle to the crust-mantle boundary, the horizontal erosion range is about twice as large as the vertical erosion range; the diapir flow model in the Andean model can well describe the formation process of Qilian arc on the northern margin of Qaidam.
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