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本文以衡阳盆地红土沉积砾石和河流沉积砾石为研究对象,对比分析了两种沉积物中砾石的粒度、球度、扁度、表面形态。研究表明,红土沉积砾石和河流沉积砾石表面次圆形、撞击坑、次棱角出现的机率存在明显差异,砾石b轴值、c轴值的分布频率也存在较大的差异。河流沉积砾石球度值比红土沉积物中砾石好,红土沉积砾石的扁度值变化幅度比河流沉积砾石要宽,扁度值分布更为集中。由此推测,河流沉积砾石的形态特征和红土沉积砾石有明显的差异,红土沉积砾石与湘江河岸沉积砾石的沉积环境不相同。
In this paper, the red gravel sediments and river sedimentary gravel in Hengyang Basin were studied, and the gravels, sphericity, flatness and surface morphology of gravel in two sediments were comparatively analyzed. The results show that there is a significant difference in the probability of occurrence of sub-circular, impacting crater and secondary edge between the gravel of lateritic sediments and river sedimentary gravel, and the distribution frequency of b-axis and c-axis values of gravel are also different. The gravel sphericity value of river sedimentary gravel is better than that of laterite sediments. The variation of the flatness value of laterite gravel is wider than that of river sedimentary gravel, and the distribution of flatness value is more concentrated. Therefore, it is speculated that the sedimentary gravels in river sediments are obviously different from those of laterite sedimentary gravels, and the depositional environments of gravel in lateritic sedimentary gravel and sedimentary gravel in the bank of Xiangjiang River are not the same.