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寒冷气候环境中的外动力,在冰川区以冰川作用为主,在冰缘区则以冻融作用为主。在这些特定的外动力条件下,形成特定的堆积体。堆积物中的石英砂则遭受到特有的外动力作用,如冰川的挤压、碰撞作用,冰水搬运的磨圆作用,以及冰缘气候下的坡积与风的交互作用等。这些外动力作用及气候条件也必然在堆积的石英砂表面上留下痕迹。因而,我们通过对石英砂表面特征的扫描电镜观察,可重建当时的环境。选择砂的粒径为0.18—0.25毫米。
The external driving force in the cold climates is dominated by the glacier in the glacier region and the freezing and thawing in the fringe region. Under these specific external forces, a specific stack is formed. Quartz sand in the sediments is subjected to unique external forces such as glacier extrusion, collision, rounding of ice-water handling, and the interaction between slope plot and wind in the ice-rim climate. These external forces and climatic conditions must also leave marks on the surface of the deposited quartz sand. Thus, we can reconstruct the environment at the time by scanning electron microscopy of the surface features of quartz sand. Select sand particle size of 0.18-0.25 mm.