Milanggouwan Profile 150ka Bp Environmental Evolution Of Trace Elements In High-resolution Records

From the understanding of high-resolution climate stratigraphy record, the paper makes some analyses on the 11 trace elements in the Milanggouwan stratigraphical section in the Salawusu River valley of the Mu Us Desert since 150 ka BP. The aim is to start from discussing whether multi-cycles sedimentary series trace elements distribution can be comparably looked upon as a result of climate icissitude.The results show that the content and variation of trace elements take on remarkably regular changes in the pace with coarse and fine sedimentary cycles of palaeo-aeolian sands to its overlying fluvio-lacustrine facies or/and palaeosols. The trace elements which chemical property are relatively stable (P. Pb^ Rb> Ivfru NK Zr ) and relatively active (V, Sn Cu> Nu As)are accordingly manifest 38 changable cycles between peak and valley values, which compose a multi-fluctuational process line of relatively gather and migrate since 150ka BP.The low numerical value distribution of these two types trace elements in the Aeolian sand facies represents erosion and accumulation under wind force during the cold-dry climate. Whereas both assemble in the fluvio-lacustrine facies and palaeosols are related to its special low-lying physiognomy position between the Ordos Plateau and the Loess Plateau under the warm and humid climate background.The paper also makes contrast between the trace elements average value of different time and oxygen isotope phases of deep sea and mainland ice core. The result shows that at warm phases 6 18O1, 8 18O 3 and 5 I8O5 , trace elements manifest higher content; at cold phases, 8 18O 2, 5 18O4 and 8 18O6 , whereas they manifest contrary changes. It indicate that the area climate change in the Salawusu River valley since 150 ka BP is the cause of past global changes in temperature.