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《Acta Sedimentologica Sinica》 2006-02
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Grain Size Distribution Characteristics of Different Geo-genetic Types of Sandy Desertification and Their Geological Significance in Southeast Mo Us Desert

LI Zhi-pei~ 1,2 YUE Le-ping~ 1 XUE Xiang-xu~ 1 WANG Min~2 YANG Li-rong~1 NIE Hao-gang~ 2 CHEN Chao (1.State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi′an 710069; 2.Xi′an Institute of Geological and Mineral Resources, Xi′an 710054)  
Sandy desertification in southeast Mo Us desert and its neighboring regions, according to their material originsand physiographiccharacteristics, can be classified into four types, sandy land in-situ type, flow valley in situ type, weathered residual in-situ type and finally the wind drifted type. The sands of sandy desertification of sandy land in-situ type come from both palaeo-aeoliansand and those of paleo-or modern fluvial or lacustrine facies. Sands of this type of desertification have the characteristics such as coarse grain, of which mid grain size are between 200-300μm or even bigger than 1mm, lower standarddeviation, and narrow and positive leaning distributionpatterns. Researches on grain size parameters show that their formation environment is likely fluvial. Sandy desertification of valley in-situ type distributes mainly in river valleys and their neighbored regions, such as flood beds, terraces and nearby districts. Sands of this type may have varietiesof sources, such as modern and paleo fluvial or flooded sediments Quaternary Epoch. Sands of this type have the characteristics of broad range mid grain size (40-445μm), middle degree of sorting,narrow and positive leaning distribution patterns. These features suggestthat the sands of river valley type desertification are mixtures of differentgeologic processes, mainly fluvial and aeolian. Weathered residual in-situ type desertification are formed by the erosion and separation by wind and fluvial forces of any sediments occurred in the region. During this process, fine grains become less and less, coarse grains remained. This type of sandy desertification mainly occurred in the north part of loess plateau. Their sands may come from paleo-aeolian sands, sandy loess, paleosols as well as paleo-fluvial terracesediments. Re-active paleo-aeolian sands have the characteristics of both homogeneous in limited areas and features of different layers. Palaeo-aeoliansands have two-graingrades in the studied area, of which average grain size are between 23-60μmand 152-202μmrespectively. They also have narrow, positive leaning distribution curves. Wind drifted sandy desertification have the characteristics such as coarse grained sands (140-310μm), low clay contents ( 5% ), and very narrow and positive leaning distribution curves. This suggests that they are the products of modern wind-blown sands. For the purpose of combating sandy desertification of different genetic type, it is important that different protect and renovatemeasurements should be used. It is strongly suggestedthat using the methods of seeding grasses andmanpower projects to fix the drifting sands during combating sandy land in-situ desertification. As for the river valley in situ desertification, the methods of reducing soil erosion, protecting terraces andflood beds should be firstly used. To deal withthe weathered residual desertification, methods of reducing water andwind erosion protecting fine-grain materialsfrom losses canbe used, such as reducing herding, vegetation and plantation. Finally, for combating wind drifted sandy desertification, manpower projects canbe used to reduce wind harm and organic measurements to increase the percentage of coverage.
【Fund】: 国土资源部国土资源大调查项目《中国三北地区荒漠化区域分类与发展趋势研究》(20011230004);; 陕西省教育厅专项科研计划项目资助
【CateGory Index】: P512.1
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