The scientists from China and German obtained the rock core by drilling in the depth of nearly 1,000 km together, aimed to study the drought process of Asian inland, cyclical changes of climate, and mineral resources in Qaidam basin.
Fang Xiaomin from the institute of Tibetan Plateau Research, Chinese Academy of Science and Owen.Appert from University Tubingen lead the team for scientical purpose to drill in depth of 1,000 m in the west of Qaidam basin. After nearly 5 months’ drilling, the project was completed successfully, and the coring rate of drill is over 95%.
Fang Xiaomin said this drilling had met the purpose of sampling and obtained new discoveries. They found that the lithological changes of rock core all displayed the fine-grained mud-salt assemblage, revealed the long-term trend and fluctuating regularity of the change, and clearly indicated of the long-term trend of turning into dry climate and the transition of fluctuate period; drilling disclosed there are a large number of salt layers in the center of the area, at least of over 100 layers, among which the number of single layer more than 2-3 meters thick is over 20.
At the same time, researchers found 3m thick saturated brine in depth of 203-206 meters, which is rich in Ka, Mg, Na and other elements. Qaidam basin is the one of most important salt reserve base; the reserve of Ka, Mg, Na, mirabilite is the richest in China. At present, it can ascertain these mineral resources are mainly located in the Chaerhan Salt Lake of the east of Qaidam basin, and it is modern brine resources in salt lake and has been shallow salt deposit for several ten thousands of years.
Some scientists pointed out that the discovery of early deep-seated salt ore and brine ore not only provided the evidence for the drought in the Asian inland caused by uplift of Tibetan plateau and for the cyclical change regularity of climate, but also expanded the areas and layers to prospect for salt and brine resources in Qaidam basin, and ascertained a new potential exploration region for salt resources.
After drilled the rock core in depth of 1,000 m, the scientists plan to drill in depth of 1,400-1,500m next year, in order to obtain the records of sequence climate change since global cooling in the middle Miocene ( 15-12 million years ago), and captured the global cooling’s influence on the drought in the north of the Tibetan plateau and the northwest inland and the ecological environment.
Fang Xiaomin from the institute of Tibetan Plateau Research, Chinese Academy of Science and Owen.Appert from University Tubingen lead the team for scientical purpose to drill in depth of 1,000 m in the west of Qaidam basin. After nearly 5 months’ drilling, the project was completed successfully, and the coring rate of drill is over 95%.
Fang Xiaomin said this drilling had met the purpose of sampling and obtained new discoveries. They found that the lithological changes of rock core all displayed the fine-grained mud-salt assemblage, revealed the long-term trend and fluctuating regularity of the change, and clearly indicated of the long-term trend of turning into dry climate and the transition of fluctuate period; drilling disclosed there are a large number of salt layers in the center of the area, at least of over 100 layers, among which the number of single layer more than 2-3 meters thick is over 20.
At the same time, researchers found 3m thick saturated brine in depth of 203-206 meters, which is rich in Ka, Mg, Na and other elements. Qaidam basin is the one of most important salt reserve base; the reserve of Ka, Mg, Na, mirabilite is the richest in China. At present, it can ascertain these mineral resources are mainly located in the Chaerhan Salt Lake of the east of Qaidam basin, and it is modern brine resources in salt lake and has been shallow salt deposit for several ten thousands of years.
Some scientists pointed out that the discovery of early deep-seated salt ore and brine ore not only provided the evidence for the drought in the Asian inland caused by uplift of Tibetan plateau and for the cyclical change regularity of climate, but also expanded the areas and layers to prospect for salt and brine resources in Qaidam basin, and ascertained a new potential exploration region for salt resources.
After drilled the rock core in depth of 1,000 m, the scientists plan to drill in depth of 1,400-1,500m next year, in order to obtain the records of sequence climate change since global cooling in the middle Miocene ( 15-12 million years ago), and captured the global cooling’s influence on the drought in the north of the Tibetan plateau and the northwest inland and the ecological environment.
Editor:sxya
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