Loess Inversion Of Paleoclimate Changes Since The Last Interglacial Period In Linfen Basin

The issue of global environmental change is attracting more and more attention.The research on quaternary climate change has a long history.The research on climate change in the geological history period,especially the research on Quaternary climate change,is an urgent need for the development of human society at present and a reference and foundation for the prediction of future climate change Linfen.Basin is located in the south of Fen-Wei seismic belt.among them,Donggou ancient human site of dingcun in linfen basin has a complete section and a clear sequence,which can well reveal the climatic evolution law of the last interglacial period.Since the last interglacial period,the climate of the linfen basin has experienced a similar alternating pattern of cold and warm with that of other regions in the world,and there are many intact and continuous loess-paleosoil profiles in the basin,which provides a good material basis for the study of paleoclimate change since the last interglacial period in the linfen basin.Based on the experimental measurement and analysis of loess susceptibility and loess particle size,the evolution of sedimentary environment in Linfen basin since 130,000 years has been well divided by the optical emission dating technique.It can be used as a reference for the determination of the age of Dingcun site.The thickness of the Donggou section in dingcun is 570 cm.The description of the sedimentary characteristics of the section and the experiments on the magnetic susceptibility and particle size of the section are carried out.The relevant data are analyzed and processed.According to the photolimetric dating data and the variation characteristics of magnetic susceptibility and particle size parameters,the climate evolution process of linfen basin can be divided into four stages: 130 ? 75 ka B.P.,strong loam formation,and obvious paleosols development,indicating that the Asian summer monsoon dominated this period,with abundant precipitation,high temperature,and the warmest and wetest.75?57ka B.P.,enhanced sedimentation,obvious loess development,indicating that the Asian winter wind is dominant,little rain,and the temperature is very low,the driest cold;57?25ka B.P.is special,and the weak paleosoil development indicates that the climate has warmed up,but it is still in the cold period,with sufficient precipitation and mild climate.From 25?20ka B.P.,sedimentation was strengthened again in this period,and loess deposition indicated that the Asian winter monsoon was strengthened,temperature fell,precipitation decreased,and the climate became cold.Ding village profile data by the linfen basin other geological data analysis,in the last interglacial period,the climate cycle of the last glaciation,linfen basin climate change and the trend of global climate change are consistent with the period,and have certain regional characteristics,may with the edge of the basin in the loess plateau region,different sediments reflects the climate sensitivity,in the regional climate change and global climate change has important significance.