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THE STUDIES OF XINING LOESS

Li Zhen;Li Lingqin;Zeng Yongnian;Ma Haizhou Department of Geography,Qinghai Normal University Department of Geography,Lanzhou University  
Based on the analyzed results of paleomagetic measurement, susceptibility, grainsize, heavy mineral and the surface texture of quartz sand in loess, the authors conclude thatthe Xining loess stratigraphy possesses continuous loess-paleosol sequence from S_0 to L_(17),which consisted of Holocene loess, Malan loess, Lishi loess and Wucheng loess. The forma-tion age of the Xining loess is about 1. 2 Ma B. P. The Xining loess originated mainly from ice sheet, glacier and periglacial district ofQuaternary in Qinghai-Tibet Plateau. Dadunling loess profile in Xining recorded rich information of environment changes inQuaternary, among which the aeolian sand layers in L_2 and L_(15) loess reflected the coldest anddriest periods and paleosolS_1, S_3 and S_4 might reflect the warmest and moistest periods inXining area since 1. 2 Ma B. P.
【Fund】: 国家自然科学基金
【CateGory Index】: P642.131
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