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Palaeoflood events in the Baojixia Gorges of the Weihe River

By field investigation in the upper reaches of the Weihe River,the Holocene loess-soil profile containing the typical palaeoflood slackwater deposit was found in the Baojixia Gorges.Analytical results of magnetic susceptibility,loss-on-ignition,CaCO3 content and grain-size distribution indicated that these palaeoflood deposits are different from the soil and the loess,and consists of fine silt and clay.According to this group of palaeoflood slackwater deposit location and climate change indicators such as magnetic susceptibility,through a number of profile comparison in Weihe River basin,and human remains of the Longshan Culture and the West Zhou dynasty,the palaeoflood events were dated to 3 200～3 000 a B.P..