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自第四纪晚期以来,来自黄土高原的粉尘在风力作用下不断向东南扩张,在长江中下游地区形成了下蜀黄土。太湖流域的部分水稻土就是在下蜀黄土之上发育的。本文对绰墩古土壤的粒度组成特征进行了系统的研究。结果表明,绰墩古土壤<5μm粘粒、5~10μm细粉砂和10~50μm粗粉砂组分平均含量分别为22.89%、22.96%和63.52%,其中10~50μm粗粉砂组分为众数粒组。>50μm砂粒平均含量仅为5.10%。绰墩古土壤粒度组成与镇江下蜀黄土粒度组成具高度相关性(r=0.97)。根据粒度分析,我们初步认定绰墩古土壤母质为下蜀黄土。
Since the late Quaternary, the dust from the Loess Plateau has been expanded to the southeast under the influence of the wind force, forming the Xiashu Loess in the middle and lower reaches of the Yangtze River. Part of paddy soil in the Taihu Lake basin is developed on the Xiashu Loess. In this paper, the characteristics of the grain size of Chuodun ancient soil were systematically studied. The results show that the average contents of <5μm clay, 5 ~ 10μm fine silt and 10 ~ 50μm coarse silt in Chuodun ancient soil are 22.89%, 22.96% and 63.52%, respectively, of which 10 ~ 50μm coarse silt is Moderate grain group. > 50μm sand average content of only 5.10%. The grain size composition of Chuodun ancient soil is highly correlated with the grain size of Xiashu loess in Zhenjiang (r = 0.97). According to the particle size analysis, we initially identified the Chuduun ancient soil parent material as Xiashu loess.