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首页> 外文期刊>Chinese science bulletin >Grain-size evidence for multiple origins of the reticulate red clay in southern China
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Grain-size evidence for multiple origins of the reticulate red clay in southern China

机译：中国南方网状红黏土起源的粒度证据

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摘要

Grain-size distributions of the reticulate red clay in Xuancheng, Anhui Province, and Jiujiang, Taihe and Ganzhou, Jiangxi Province, are analyzed. The results are as follows: (1) Generally fine and uniform, grain-size characteristics of the reticulate red clay in Xuancheng and Jiujiang are much similar, with no >2 mm gravels, 0.30 percent and 1.14 percent of >S3 mu m fraction on average, respectively, and 34.65 percent and 37.20 percent of 10-50 mu m fraction, which is apparently accumulated. The patterns of the grain-size distribution curves of the uppermost yellow-brown earth of the profiles in the two areas much resemble those of the loess in northern China and the Xiashu loess in southeastern China, while the patterns of the other layers also apparently show some attributes inherited from the above. The grain-size distribution patterns of the quartz separated from the whole profiles in the areas are almost identical, which could also be compared with those of the loess and the Xiashu loess. All the features above reveal aeolian characteristics of the reticulated red clay in these two areas. (2) The reticulate red clay in Taihe and Ganzhou is much coarser than that in Xuancheng and Jiujiang, with high content of >63 mu m fraction and relatively low content of 10-50 mu m fraction. The variations in grain-size distributions of the profiles are also observed. The grain-size distribution patterns of both the original samples and the quartz of the red clay could hardly be compared with those of the loess and the Xiashu loess. All the features above reveal their alluvial or diluvial origins. (3) The multiple origins of the reticulate red clay in the areas reflect the diversity and complexity of the Quaternary environment in southern China. The existence of the reticulate red clay with aeolian characteristics brings forth objective evidence for the occurrence of large-scale dest deposition in southern China during the Quaternary glacial periods. Further investigation and study on the regional distribution of this kind of the red clay will be conducive to revealing the southern border of the large-scale dust deposition in southern China during the Quaternary.
机译：分析了安徽省宣城市，江西省九江市，太和市和赣州市的网状红黏土的粒度分布。研究结果如下：（1）宣城和九江网状红黏土的粒度特征总体上均匀一致，没有砾石> 2 mm，> S3μm占0.30％和1.14％。平均分别为10-50微米级分的34.65％和37.20％，这显然是累积的。这两个地区剖面最上层的黄棕色土的粒度分布曲线的模式与中国北部的黄土和中国东南部的下蜀黄土的模式非常相似，而其他各层的模式也明显显示出从上面继承的一些属性。从该区域的整个剖面中分离出来的石英的晶粒尺寸分布图几乎相同，这也可以与黄土和下蜀黄土进行比较。以上所有特征揭示了这两个区域中网状红粘土的风沙特征。 （2）太和，赣州的网状红黏土比宣城，九江的红黏土粗得多，其含量> 63μm，含量较低，为10-50μm。还观察到轮廓的晶粒尺寸分布的变化。原始样品和红黏土石英的粒度分布模式几乎无法与黄土和下蜀黄土的粒度分布模式进行比较。以上所有特征揭示了它们的冲积或冲积成因。 （3）网状红黏土在该地区的多重起源反映了中国南方第四纪环境的多样性和复杂性。具有风沙特征的网状红黏土的存在为第四纪冰川期华南地区发生大规模的目的沉积提供了客观的证据。对这种红黏土的区域分布进行进一步的研究和研究，将有助于揭示第四纪中国南部大规模尘埃沉积的南部边界。

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