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《Quaternary Sciences》 1991-04
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PROGRESS IN LOESS RESEARCH (PART 3):TIME SCALE

Ding Zhongli (Institute of Geology,Chinese Academy of Sciences) (Xi(?)an Laboratory of Loess and Quaternary Geology,Chinese Academy of Sciences) Yu Zhiwei (Department of Geology,China University of Mining and Technology) Liu Tungsheng (Instituse of Geology,Chinese Academy of Sciences)  
In Baoji loess-soil section,a total of 1630 samples was taken at an interval of 10cm.Grain size was analyzed for each sample using a Sedigraph 500 E Analyzer in Xi'an Lab ofLoess and Quaternary Geology,Chinese Academy of Sciences.The ratio of the fraction largerthan 10μm to that finer than 2μm is used as an indicator of the variation in wind velocitywhich transported the loess grains from deserts to the Loess Plateau.Visual examination showsthat loess units have larger grain size than soils,suggesting stronger winds in glacial periodsthan during interglacial periods.This grain-size record is then used to develop an astronomi-cal time scale for Chinese loess deposits by the following procedures.1.An initial time scale was established under paleomagnetic controls based on the assump-tion that loess deposition rate during glacial periods is twice higher than that in interglacialperiods.2.The maxima/minima of the grain-size record in the initial time scale is then matched byadding new time control points with maxima/minima of the theoretical variation in the or-bital parameters of the Earth calculated by Berger (1978).3.Using spectral filtering technique,the orbital components were filtered from the grain-size record,and were then designed to be superimposed on the orbital target by stretching andcompressing the initial time scale.The procedure 3 was repeated for about 55 times.An orbitally-tuned time scale is thenobtained with the magnetic boundaries remaining basically unchanged with respect to the ra-diometric ages.The filtered components of the orbital periods from the orbital time scale areexcellently superimposed on the theoretical variations.Based on the astronomical time scale,ages for the thirty-seven major soils in the Baoji section were estimated.
【Fund】: 国家自然科学青年基金
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