Climatic Change Recorded By Sedimentary In Kunlun Pass Basin Of Qinghai-Tibet Plateau

Kunlun Pass Basin is located in the middle of the East Kunlun Mountains of the Qinghai-Tibet Plateau,which is in the unique geographical position.Basin-wide development of thick sediments from the late Pliocene to middle Quaternary detailed records of the regional structure.The evolution of climatic change history is to study the Tibetan Plateau uplift of the Cenozoic climate and the evolution of the ideal region.Based on the Kunlun Pass Basin sedimentary since the new system of records,access to the following conclusions and perspective:â‘ Through the Kunlun Pass Basin 2.58～0.5Ma period of high-resolution magnetic susceptibility indexes sequence analysis,and the deep Atlantic Seaδ¹⁸O curves contrast,Kunlun Pass Basin sediments susceptibility and the relationship between climatic change: the low magnetic susceptibility and humid climate counterparts;otherwise,with the cold and dry climate agreement.â‘¡Through the Kunlun Pass Basin 2.32～0.5Ma period of high-resolution lake sediments grain size of the group changes the sequence,and pollen,and other research materials as well as the deep Atlantic Seaδ¹⁸O curves and the Loess Plateau loess-paleosol record curve,contrast that lacustrine sediments 7.8～63μm particle percentage change to reflect more sensitive ancient climatic change,reflect its low warm climate;otherwise,with the cold and dry climate.â‘¢By contrast,the Kunlun Pass Basin susceptibility and grain size indicators since 2.32Ma has been better comparability,with the grain size and magnetic susceptibility of high value(low) corresponding with overall trend line and can verify.Meanwhie,they always revealed the climatic change of Kunlun Pass Basin has five different periods: 2.58～1.95/1.94Ma,humid climate; 1.95/1.94～1.82Ma,cold and dry climate;1.82～1.07Ma,climate overall warm and slightly wet,but there have been several cold and dry oscillations;1.07～0.81/0.82Ma,to be cold and dry climate;0.81/0.82～0.5Ma,developing to a more cold and dry climate.â‘£The power spectral analysis of Kunlun Pass Basin 2.32～0.5Ma period high-resolution grain size by REDFIT3.8 showed that the climatic change of Kunlun Pass Basin during this period on the scale track(23¹00ka) cycle changes are reflected,also exist millennium and a few hundred thousands years-scale oscillation of climate instability.Climatic change have been driven by many factors,and reflects not only global climatic change synchronized information,but also demonstrate its obvious regional characteristics.The main external factors of climatic change of Kunlun Pass Basin was solar radiation;within the internal factors,high latitude,Qinghai-Tibet Plateau,risk factors and tropical sea marine were perhaps the most important,in which the great uplift of Qinghai-Tibet Plateau since late Pliocene maybe the driven dynamic mechanism and power of the climatic change and climate developing to dry in Kunlun Pass Basin.