Yang Shun et al. -Sa: Direct evidence of Seismology in the Double Swing Model of New Tyzyang

Author:Institute of Geological Earth Time:2022.08.30

New Tetis closed and subsequent India-Eurasia collisions are one of the global iconic structures and have a significant impact on the new generation of climate and ecosystems. During the New Tisteo period, the Indian sector drifted north to the north, which caused a strong collision of India-Eurasia. The dynamic mechanism of high -speed drift in the Indian sector has long been doubtful. At present, there are two different interpretation models in the academic community. The first model believes that the reduction of the Indian rock rings leads to a decrease in drift resistance (Kumar et al., 2007). The second is the new Dishari dive model. It is believed that there is a second dive between the Eurasian and the Indian sector, and the new Tetis is dived along the two dive bands at the same time (Jagoutz et al., 2015). In today's Titis sector gathers the border mantle, the ruins of the new Tyeds' dive system will provide direct deep evidence to distinguish the two models. The Himalayan mountain belt formed by India-Eurasia collision and most of the new Tetis's dive plates below the neighboring area have been broken and dismantled, and it is difficult to rebuild the dive system; The post -renovation effect is small, which is the ideal area of detecting the new Stepus's dive relic. However, due to the lack of local earthquake observation materials, the fine structure of the mantle in Myanmar is insufficient.

Since 2016, the Earth-Planetary internal structure and process of planetary internal structure and process of the Earth and Planet Physics Institute of the Institute of Geology and Earth Physics of the Chinese Academy of Sciences and the Earthquake Laboratory of the Institute of Earthquake Wide frequency belt -flowing earthquake observation provides important data support for the deep structure and earthquake -proof disaster reduction in Myanmar (Mon et al., 2020; zheng et al., 2020).

Recently, Yang Shun, a doctoral student in the discipline group, was researcher at He Yumei, associate researcher Jiang Mingming, associate researcher Liang Xiaofeng of the National Key Laboratory of the Rock Circle, and under the guidance of a multi -disciplinary research team, etc. The observation data of the earthquake array was for the first time in the upper mantle of Myanmar. They combined with limited frequency waves to analyze their imaging and two -dimensional wave -shaped simulation methods, revealing that two of the upper mantles in Myanmar's upper mantle parallel, north -south, and east -tilt earthquake waves high -speed abnormalities, speculated that the section was dived. Combined with the revealed dive related magma activities and the time and space distribution of snake green rocks, they believe that the spatial location and form of the dive sheet in the mantle may marked the existence of the New Tetiso's double dive system. In addition, they further revealed the corner flow caused by the continuous dive of the west side plate through the dynamic value of the earth dynamics. Keep in the upper mantle. This work provides a convincing evidence for the double dive model of New Tyzyang, which helps to deeply understand the operating mechanism of the Titz earth power system.

Figure 1 The Earth Science Multi -Discipline Evidence of the New Tetis Ocean Double Discipline (the illustration of the illustrations at the top and the bottom is modified from Jagoutz et al., 2015)

The research results were published in the international academic journal Science Advances Neo-Tethyan Ocean [J]. Science Advances, 2022, 8: EABO1027. Doi: 10.1126/Sciadv.abo1027). Research results are subject to the National Natural Science Foundation of China (91755214, 42030309, 41490612), the International Partner Project of the Chinese Academy of Sciences (GJHZ1776) and the key deployment project of the Institute of Geology and Geophysics of the Chinese Academy of Sciences "IgGCAS-201904) Joint funding.