Holocene climate changes recorded by elemental geochemistry in the Salawusu River Region

The Dishaogouwan strati graphic section of the Salawusu River valley is located at the southeastern margin of the Mu Us Desert on the Ordos Plateau of Inner Mongolia, which is the transition zone between the Mu Us Desert and the Loess Plateau and is sensitive to global climate changes. This is an ideal region to study global climate changes. Constant elements such as Si, Al, Fe, Ca, Mg, K, Na and their ratio changes in DSGL section in the Salawusu River region were analzyed, 14C dating combined with elemental geochemistry proxies indicated that before 9.6 ka BP, the climate was dry and cold, with strong wind-sand activities. From 9.6 ~> 8.4 ka BP, the climate became warm and wet with dry-cold fluctuation. Holocene Climate Optimum period took place from 8.4 ~> 4.0 ka BP, and 8.4 ~>6.5 ka BP was the Mega thermal Maximum, i.e. , the maximum lake period. From 6.5 ~> 4.0 ka BP, the climate also continued to be wet with the lake started to become smaller. From 4.0 ~> 1.2 ka BP interval, the climate turned to be dry and cold, developed swamps. A relatively warmer period occurred in 1.2 ~> 0.7 ka BP interval. From 0.7 ~ 0.5 ka BP, the climate turned to be dry and cold again and the river was formed. The record in the profile can be compared with the cold events in the north Atlantic, δ18O record from Dongge Cave, average solar radiation, reflecting the consistency of the regional climate change and global climate change.