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    ZHANG You-long, ZHOU Ling-qi, ZHANG Wei-xiong, et al. The characteristics of rock, grain-size, sporo-pollen and depositional model in the oldest loess section in Lanzhou[J]. Northwestern Geology, 2003, 36(3): 29-35.
    Citation: ZHANG You-long, ZHOU Ling-qi, ZHANG Wei-xiong, et al. The characteristics of rock, grain-size, sporo-pollen and depositional model in the oldest loess section in Lanzhou[J]. Northwestern Geology, 2003, 36(3): 29-35.
    shu

    The characteristics of rock, grain-size, sporo-pollen and depositional model in the oldest loess section in Lanzhou

    • 1.

      Lanzhou Institute of Seismology, Bureau of Seismology of China, Lanzhou 730000, China

    • 2.

      Third Institute of Geology and Mineral Exploration, Geological Survey of Gansu Province, Lanzhou 730050, China

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    • Received Date: December 26, 2001
    • Revised Date: January 03, 2002
    • Published Date: September 04, 2003
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      • Abstract
    • The oldest loess deposits in Lanzhou area,formed 1.84 Ma.B P ago,was recognized for the first time in the Shanchengwanling Section,Digou village,Yongdeng county,North of Lanzhou.It has eighteen integral sequences of loessp aleosol.The average grain-sizes of loess are 23.57 μm,and of paleosol is 19.10 μm.The loess is composed of siltstone and 90% grass-flower flours in sporo-pollen a ssemblage.On the basis of field survey and indoor systermatic study,the authors summarized the genesis of loess and depositional model,determined the location of up and down siltstone layers through stratigraphic correlation.
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      • References (4)
    • 张有龙,等.兰州地区最老黄土的发现及其特征[J].中国区域地质 2001,(2):141-145.
      陈发虎,张维信.甘青地区的黄土地层学与第四纪冰川问题[M].北京:科学出版社,1933.13-14,59-74.
      朱俊杰,曹继秀,钟巍,等.兰州地区黄河最高阶地与最老黄土沉积的发现及其古地磁年代学研究青藏高原形成演化、环境变迁与生态系统研究[M].北京:科学出版社,1994.77-89.
      王永焱.黄土与第四纪地层[M].西安:陕西人民出版社,1982.20-47.
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