Studies found that the modern Yellow River water was formed before 1.25 million years ago

Xinhua News Agency, Lanzhou, August 17th. After years of hard work, Lanzhou University's landform evolution and the new -generation environmental research team basically figured out the formation era of the modern Yellow River system, that is, the modern Yellow River water system began to be formed a few years ago.

The Yellow River is the second largest river in China and the cradle of Chinese civilization. Wang Xin, a member of the backbone of landform evolution and the new generation of environmental research team and a professor of the School of Resources and Environment of Lanzhou University, introduced that the formation of the formation evolutionary history and its driving mechanism of the modern Yellow River system can provide important to understanding the structure of the structure of the geographical environment of my country. evidence. The formation of the "Ji" bay and the Yellow River running through the Sanmenxia east of the sea are an important symbol of the formation of the modern Yellow River water system. The era of the modern Yellow River water system still has different views of 150,000 years ago, no later than 1.2 million years, and about 5 million years ago. The understanding of the reasons for formation is also different.

According to reports, the Sanmenxia is the last canyon on the dry flow of the Yellow River. It is a throat connecting the middle and downstream of the Yellow River. In the past, Chinese and foreign scientists mainly conducted research around the appearance of the Sanmenxia Basin and the surrounding areas. However, due to the disclosure of the layers of the late New students, the research section is often spliced ​​from a short section of several kilometers apart, coupled with the complex structure, high vegetation coverage, and serious strata weathering. Related research on the section, sedimentary division, and division of deposition, and division of deposition, and division of deposition, and division of deposition, and division of deposition, and division of deposition, and division of deposition, and division, and division of deposition. There are great uncertainty in the measurement of the age.

The research team went to the Sanmenxia Basin for inspection. Interviewee confidence

Under the coordination and guidance of Chen Fuxi, an academician of the Chinese Academy of Sciences, the team and the China Earthquake Administration Institute of Geology, the First Monitoring Center of the China Earthquake Administration, the University of Shiman University, and the Chinese University of Geosciences (Wuhan), etc., implemented the environment at the Sanmenxia Basin Center Drilling and conducting cooperative research. The team obtained the complete rock core record of the Yellow River through the history of the Sanmenxia. Through the comparison with the edge of the basin, the first appearance of the river sediment at 108 meters of the rock core was the oldest imprint left by the Yellow River in the Sanmenxia area. "The history of the Yellow River is written in the core of the rock, and drilling the rock core is used to study the history of the Yellow River." Wang Xin said.

The research team drilled in the Sanmenxia Basin to get the core file. Interviewee confidence

The team used a variety of technical methods such as the sedimentation of systems, the annual magnetic year of the ancient place, and the analysis of the material, and obtained the results of the research: since 1.25 million years ago, the sedimentation of the Sanmenxia Basin River began to develop on a large scale. The material began to influx in large quantities, and the sedimentary environment has undergone a significant transformation from a closed salt water -micro -salt water lake environment to an open river environment. The results of this 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. Related results have been published recently in the authoritative journal "Scientific Report" (English version). (Reporter Zhang Wenjing)

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