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Li C.-A.,Wuhan University | Zhang Y.-F.,Wuhan University | Yuan S.-Y.,Wuhan University | Shao L.,Wuhan University | And 5 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

Based on the grain size analyses of "Wushan Loess" at Wushan area, the causes of "Wushan Loess" are discussed in this paper. The results show as follows. The component particles of the "Wushan Loess" are predominantly less than 50 μm with the average content of >50 μm about 16.9%; the average content of coarse silt (10-50 μm) is 43.1% as the "dominant group" of the "Wushan Loess"; the average content of 5-10 μm group is 14.5% and < 5 μm group makes up 25.5%. The characteristics of grain size parameters and frequency and probability cumulative distribution curves are the same as those of typical atmospheric dust sediment, which shows that the "Wushan Loess" is of aeolian origin. C-M, L-M, A-M chart and statistical indices of grain size distribution are obviously different from those of fluvial sediment and are the same as those of Xiashu Loess distributed in the middle and lower reaches of the Yangtze River. The most discriminant analysis result is of negative value, which displays that the aeolian origin is prevailing and individual layer is affected by water flow action. Source


Zhang Y.-F.,Wuhan University | Li C.-A.,Wuhan University | Shao L.,Wuhan University | Luo H.,Wuhan University | And 4 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

In this paper we present the magnetic fabric and magnetic susceptibility characters of one newly found "Wushan Loess" Section, which was also compared with the modern Yangtze River sediments and aeolian loess and "Sand-Dune" sediments distributed at the Middle Yangtze River. The results are as follows. (1) The κ, P, F, L, E values of the "Wushan Loess" are close to those of the aeolian loess and "Sand-Dune" sediments, however these values are obviously lower than those of the modern Yangtze River sediments. (2) Shown on the F-L graph, data of the "Wushan Loess" converge upon the origin of coordinates, similar to the aeolian loess and "Sand-Dune" sediments distributed at the Middle Yangtze River, which reveals sedimentary environment with relatively lower power. Data of the modern Yangtze River sediments lies around the F-axis, showing more dominance of F rather than L. (3) Maximum magnetic principal axis of the "Wushan Loess" is similar to that of the aeolian loess and "Sand-Dune" sediments distributed at the Middle Yangtze River, with the direction of declination relatively dispersing and the inclination of long axis varying between 36° and 38° and the inclination of the short axis varying between 37° and 39°. However the direction of maximum magnetic principal axis declination of the modern Yangtze River is relatively stable with inclination of the long axis smaller than 10° and short axis bigger than 80°. (4) T values of the "Wushan Loess" vary between -1 and 1 while T values of the modern Yangtze River are mainly higher than 1. Generally, magnetic fabric characters are similar to aeolian loess and "Sand-Dune" sediments distributed at the Middle Yangtze River, revealing its aeolian origin. Source

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