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| Environmental Evolution since the Middle-Late Holocene in the Maqu Plateau Reflected by Constant Element Oxides Content and Ratios |
| Hu Mengjun, Yang Aili, Zhang Wenli |
| College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China |
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Abstract Based on the concentration of constant element oxides of a middle-late Holocene loess-paleosoil-aeolian profile in the Maqu Plateau, we have found the total concentration of constant element oxides is up to 91.93%, and is followed by SiO2(67.93%) >Al2O3(11.2%) >Fe2O3(3.97%) >CaO(3.76%) >K2O(2.16%) >Na2O(1.81%) >MgO(1.1%). Accompanied by carbonate leaching and the depletion of mobile element Na and Ca, the profile had experienced an incipient stage of chemical weathering. The ratio of the constant element oxides indicated that the climate of the Maqu Plateau had changed in temperature cycle from cold-dry－cool-humid－warm-humid to cool-dry since middle-late Holocene. Based on the environmental characteristics revealed by concentration of constant element oxides and ratiosand combined with 14C dating, the environmental evolution in the Maqu Plateau since the middle-late Holocene can be divided into four stages. Before 4.6 ka BP, cold-dry climate with strong winds prompted intense aeolian activities so the Plateau had experienced a strong sandstorm activity period. From 4.6 to 4.3 ka BP, sand activity weakened with the climate transit from cold-dry to cool-humid. During 4.3-0.3 ka BP, under the background of increasing temperature and humidity, sand dunes getting fixed and consolidated into soil. Since then sand activity increased with the climate became cool and dry.
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Received: 14 November 2014
Published: 20 March 2015
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2015, Vol. 35 
