Abstract
AbstractFlooded sediments and normal river sediments have similar sedimentary features in stratigraphic profiles. It is difficult to distinguish 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‐broken fan deposits of 1998 with that of modern flood land deposits of the Yangtze River nearby Paizhouwan. Combined with the magnetic fabric character of flood land sediments in lower reaches of the Yangtze River, we reveal 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‐broken fan deposits. And they are closely related with the sedimentary environments. So it is an effective method for distinguishing 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.
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