After detailed field work on the stabilized and semi-stabilized sand dunes of different micro-geomorphology in Horqin sandyfield

25 OSL samples and 5 radiocarbon samples are collected for dating to reconstruct the eolian dune activities in the Holocene. Single-Aliquot Regenerative-dose (SAR) protocol was used to determine the equivalent dose (DE) for coarse quartz OSL dating. Based on OSL and 14C dates obtained from five sand dune-soil or swamp sediment profiles

a preliminary geochronology was presented for the sand dune activities in the Holocene. The results show that the sand dune activity was more and more weakly in the early Holocene and stabilized at around 7.5 ka B.P.. The Horqin sandyfield developed its grass soil and corresponding vegetation between 7.5 ka and (2.0±0.2) ka B.P. and the sand dunes were re-active after (2.0±0.2) ka B.P.

possibly due to the human activities.