China News Service, Ritu County, Tibet, July 23 (Reporter Sun Zifa) China's second comprehensive scientific investigation and study on the Qinghai-Tibet Plateau (Second Qinghai-Tibet Scientific Research) "Human Activity History and Its Impact" team, 22nd in Ngari District, Tibet Jieze Chaka, a plateau lake with an altitude of more than 4,500 meters in Tuxian County, successfully completed the lake sampling work, and collected sediment cores of 0-1.5 meters, 0-3 meters, 3-6 meters, and 6-9 meters below the lake bottom, as well as several lakes. Sediment etc.

The scientific expedition team packs the collected core samples on the lake drilling platform.

Photo by China News Agency reporter Sun Zifa

  That day was the third day of the scientific expedition team camping to settle on the shore of Chaka Lake. The expedition team members carefully analyzed and summarized the crux of the failure of the previous trial drilling, researched and proposed targeted solutions and implemented them.

After they pushed the lake drilling platform to a predetermined location on the lake surface with an inflatable speedboat, they first obtained a 0-1.5m core sample from the bottom of the lake through a gravity drill sampler. Then, the scientific expedition team successfully completed the 0-3m bottom of the lake in the same way through hard work. Core sample collection operation.

  On this basis, the scientific expedition team made persistent efforts and used piston drill samplers on the lake drilling platform to continuously drill 3-6 meters and 6-9 meters long cores below the bottom of the lake, and harvest high-quality deep core samples of plateau lakes , And also a perfect ending for the conclusion of the Chaka scientific research work.

The scientific expedition team carefully carried the collected core samples on the lake drilling platform.

Photo by China News Agency reporter Sun Zifa

  Dr. Sun Zhe, a member of the scientific expedition and the Institute of Tibetan Plateau Research of the Chinese Academy of Sciences (Tibetan Plateau Institute of the Chinese Academy of Sciences), said that the conclusion of the Chaka Lake drilling work is the first time that the research team has obtained a continuous core of more than 8 meters in a salt lake, achieving the expected goal. .

The samples will be sent back to the laboratory of the Qinghai-Tibet Plateau Institute of the Chinese Academy of Sciences in Beijing for cutting, scanning, sub-sampling and a series of index tests.

These experiments are expected to help scientists clarify the changes in lake water levels and the changes in temperature and precipitation in the Jieze Chaka area on the Qinghai-Tibet Plateau in the past 20,000 years. This can help scientists understand the natural conditions under which historical humans began to appear and settle in the Ngari area. .

The scientific expedition team dropped anchors of the fixed platform on the lake drilling platform.

Photo by China News Agency reporter Sun Zifa

  Researcher Hou Juzhi from the Qinghai-Tibet Plateau Institute of the Chinese Academy of Sciences, the leader of the scientific expedition, said that the successful completion of the sampling of the Lake Chaka Lake was the result of the unity and cooperation of all scientific expedition members under the unsuccessful trial drilling. Provide reference, especially in the preparation of scientific examinations requires careful preparation.

"It is not terrible to encounter problems in the scientific examination process. Only by unity and cooperation can problems be solved and the work can be done solidly."

  In Tibet, China, "wrong" means lake in Tibetan language, and Chaka means salt lake in Tibetan language.

The local government set up a public notice for Lake Chaka, which stated that the plateau salt lake is located at the boundary of Dongru Village, Dongru Township, Ritu County, Tibet, and Duoma Village, Duoma Township, with an elevation of 4,973 meters and an area of ​​112 square kilometers.

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