【摘要】 通过对内蒙古大青山北麓大南窑子黄土剖面的野外观察、定年和粒度分析等研究,首次将该黄土剖面厘定为中更新世堆积,属于上部离石黄土,其层位大致与S2古土壤层相当。对粒度参数的计算和粒度成分的分析表明,该套黄土显示风成相为主,具有风水两相的特点,黏粒(<5μm)含量很高,平均含量54 32%,具有多层钙结黄土层,揭示出该套黄土形成于气候相对湿润,且以夏季风为主,风化成壤作用很强的环境中。此研究为该区中更新世气候研究和古气候年表的建立提供了时间标尺和基础资料。更多还原

【Abstract】 According to field observation, age and grain--size analyses of the Dananyaozi section in the northern piedmont of the Daqingshan Mountain, the loess section is firstly determined to be mid--Pleistocene in age. It belongs to the upper Lishi loess and corresponds to layer S₂ paleosol. The loess features appear mainly wind phase with the wind--water two phases by calculating grain size prameters and analysing the grain--size. The high content of clay（<5 μm）, with the average of 54.32%, and mulistory calcareous loess layers indicate that it is formed in the condition of moist climate, dominating summer monsoon. This research reveals the paleoclimate of the loess depositing during the period, which is useful for the study of mid--Pleistocene and paleoclimate supplies time scales and basic materials to the construction of paleoclimate chronology.更多还原