A comparative study of magnetic fabric characters between flooded sediments and normal river sediments
长江中游地区洪泛沉积物与正常河流沉积物磁组构特征对比研究

The flooded sediments and normal river sediments have similar sedimentary features in stratigraphic profile. It is difficult to identify these two types of sediments only based on sedimentary features. In order to identify the ancient flood disaster events, it is significant to establish identification marks of sediments from the environment magnetism. We have made a systematic sampling and measuring, and compared the magnetic fabric character of Paizhouwan dam-break fan deposits with the magnetic fabric character of modern flood land deposits of the Yangtze River nearby Paizhouwan, and combined with the magnetic fabric character of flood land sediments in lower reaches of the Yangtze River. It is shown that the features of magnetic fabric of normal river sediments in middle and lower reaches of the Yangtze River are greatly different from that of dam-break fan deposits. And they are closely related with the sedimentary environment. So it is an effective method for identifying flood sediments and normal river sediments through measuring magnetic fabric parameters of sediments in the middle reaches of the Yangtze River and studying the shape of magnetic anisotropy susceptibility magnitude ellipse.