The research team of Lanzhou University reveals the formation of the modern Yellow River system

The Yellow River is the sixth largest river in the world, the second largest river in China, and the cradle of Chinese civilization. The formation of the formation of evolutionary history and its driving mechanism of the modern Yellow River Water system can provide important evidence for how to shape the structure-climate interaction. The formation of the "Ji" bay and the east of the Sanmenxia Gorge in the East of Sanmenxia are an important symbol for the formation of the modern Yellow River water system. In the formation of the formation of the Yellow River Water system, there are still more than 150,000 years, no later than 880,000 years, no later than 1.2 million years, ~ 1500-16 million years, ~ 5 million years, etc. There are different understanding of the reasons for its formation.

The Sanmen Gorge is the last section of the canyon on the dry flow of the Yellow River. It is the throat area connected to the middle and downstream of the Yellow River. In the past, Chinese and foreign scientists mainly carried out research around the appearance of the Sanmenxia Basin and the surrounding areas. However, due to the disclosure of the late -born strata in the late New students, the research section is often spliced ​​by a few kilometers apart. High degree and strata have serious weathering. There are large uncertainty in the aspects of section, deposition, and determination of the age.

Under the coordination and deployment of Academician Chen Fahu, Professor Wang Xin, Professor Hu Zhenbo, Professor of Nie Junbo, Professor Nie Baotian, etc. In the Concernal of the Institute of Geological Research of the China Earthquake Administration, the First Monitoring Center of the China Earthquake Administration, the University of Shimagen University, and the China University of Geosciences (Wuhan), etc., we implemented an environmental drilling and conducting cooperative research at the Sanmenxia Basin Center. The historically complete rock -core file, through the comparison with the edge of the basin, clarifies the first appearance of the sedimentation of the river core 108 m in the rock core 108 m is the oldest imprint left by the Yellow River in the Sanmenxia area.

Figure 1 SMX19 Drilling rock core and sedimentary environmental change record

The sedimentation of the system, the annual magnetic annual year, the analysis of the material (SR-ND isotope & heavy mineral combination), and the ancient environment agency index record (granularity & easily salt) research results show that from ~ 1.25 million years The debris of the upstream Ordos of Ordos began to poured in large-scale development, and the sedimentary environment has undergone a significant change from closed salt water-micro-salt water lake environment to open riverside environment. Comprehensive evidence of newly carried out the evidence of landform analysis, the series of evidence of the Yellow River in the middle of the Yellow River midstream published by Professor Pan Baotian, and the sedimentation of the edge sea deposition published in recent years. The acceleration of the sea level of the transition period has a new understanding of the formation of an important impact. The results of the study clarified the formation of the modern Yellow River Water system, and provided a new perspective for studying the evolutionary history and the development of the water system for studying the formation of the world.

Figure 2 The formation process of the modern Yellow River system and its comparison with the global sea level changes

The research results were published in the authoritative journal Science Bulletin on August 15th in the form of August 15th, and were selected as the cover article 15 of 2022. Professor Wang Xin at the School of Resources and Environment of Lanzhou University is the first author and communication author of the paper, and an associate researcher of Hu Gang, an Institute of Geological Research Institute of the China Earthquake Administration as the joint communication author. This study has been obtained from LZUJBKY-201-EY12), National Natural Science Foundation (42072211), Second Qinghai-Tibet Plateau Comprehensive Science Inspection Research Project (2019qzkk0602), and Central Public Welfare Research Institute Joint funding for business project (Igcea 2008).

Article link:

https://www.sciencedirect.com/science/article/abs/pii/s209592732002365?VIHUB

Source | Propaganda Department of the Party Committee of Lanzhou University (News Network)

Edit | von Yifu

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