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A Multi-cycle Climatic Fluctuation Record of the Last Interglacial Period:Typical Stratigraphic Section in the Salawusu River Valley on the Ordos Plateau,China

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Acta Geologica Sinica(English Edition) 2005年第3期79卷 398-404页

作者： LIBaosheng DavidDianZHANG wenxiaohao DONGYuxiang ZHUYizhi JINHeling DepartmentofGeography SouthChinaNormalUniversityGuangzhouGuangdong510631／／StateKeyLaboratoryofLoessandQuaternaryGeologyInstituteofEarthEnvironmentChineseAcademyofSciencesXi＇anShaanxi710061 DepartmentofGeography SouthChinaNormalUniversityGuangzhouGuangdong510631 DepartmentofGeographyandGeology TheUniversityofHongKongHongKong DepartmentofGeography SunYat-SenUniversityGuangzhouGuangdong510275 StateKeyLaboratoryofLoessandQuaternaryGeology InstituteofEarthEnvironmentChineseAcademyofSciencesXi＇anShaanxi710061 ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute ChineseAcademyofSciencesLanzhouGansu730000

The Last Interglacial Period strata in the Milanggouwan section in the Salawusu River valley on the Ordos Plateau, China, have 8.5 sedimentary cycles composed alternately of eolian dune sands, fluvio-lacustrine facies and paleosols. Based on comprehensive analyses on the distribution of magnetic susceptibility and CaCO3 and paleo-ecology indicated by fossils in the region, it is considered that the sedimentation cycles resulted from dry-cold and warm-humid climate fluctuations. Magnetic susceptibility values and CaCO3 contents in stratigraphic sectors I, III, V and II, IV basically respectively present peaks and low vales, and the former three can in time correlate with MIS5a, MIS5c and MIS5e successively and the latter two with MIS5b and MIS5d. In addition, some horizons of eolian dune sands and the low vales of their magnetic susceptibility and CaCO3 are also correlated with 6 periods of cooling events indicated by the higher content of foraminifer Neogloboquadrina pachyderma (S.) documented in the V29—191 drill in the North Atlantic and the cold events recorded by δ 18O in the ice cores in GRIP, especially with 9 periods of dust events in Chinese Loess Plateau.

关键词： last interglacial period dune events cold-warm climate cycles Salawusu River valley Inner Mongolia

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Deposition of sandstorms in a vegetation-covered sand dune in Ejin Oasis and its characteristics

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Journal of Geographical Sciences 2006年第4期16卷 502-508页

作者： wenxiaohao LI Baosheng WANG Wei LI Sen OU Xianjiao ZHENG Yanming Sehool of Geography South China Normal University Guangzhou 510631 China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment CAS Xi＇an 710075 China Department of Tourism Resourees and Environment Foshan University Foshan 528000 China

＂Ejin Section＂ found in a typical vegetation-covered sand dune in Ejin Oasis was investigated. In this study, 263 samples were taken from the section for grain-size analysis, 25 for chemical analysis, 11 for ^14C dating and 6 for scanning electron microscope （SEM）. The results of the study indicate that 3 types of the sediments in the section can be identified, YS, LS and ST. YS, homogeneous yellow-brown dune sands, is equal to those of inland deserts, LS, loess-like sandy soils, is the same as the sandy loess in the middle Yellow River and modem falling dusts, and ST, sandy sediments interbeded with the deadwood and defoliation of Tamarix spp, represents the depositional process of the section interrupted by abrupt changes in climate. The Ejin Section has recorded the repeated dust-storms or sandstorms since 2500 yr BP and the peak periods of the dust-storms or sandstorms revealed by the section are consistent with the records of ＂dust rains＂ in historical literatures, indicating that the change of climate is a key factor to increase sandstorms or dust-storms, whereas, ＂artificial＂ factor may only be an accelerating one for desertification.

关键词： Ejin Oasis vegetation-covered sand dune dust storm sandstorm grain size major chemical element

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