Comparison of correlation between magnetic susceptibility and grain size for lacustrine sediments in eastern Tibetan Plateau and loess deposits in Chinese Loess Plateau
Shi Wei1,2, Jiang Han-Chao1
1 State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China; 2 College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China
Abstract：To explore the correlation between magnetic susceptibility(SUS)and grain size of the dust deposits from the tectonically stable and active regions and its implications for environmental events,the grain size and SUS records from the Lantian loess sediments-paleosol of the Chinese Loess Plateau(CLP)were analyzed and compared with that of the lacustrine sediments from the eastern margin of the Tibetan Plateau(TP). Results indicate that the SUS of the loess sediments has the strongest positive correlation with the loess sediments of 2~10 μm grain size in the Chinese Loess Plateau(CLP) and strongest negative in the Tibetan Plateau,respectively,indicating that the 2~10 μm grain size of dust sediments were continuous and stable,which were deposited in the background of the arid to semi-arid regions in the CLP and TP and even in Asia. On the other hand,SUS showed the strongest positive correlation with the 32~63 μm grain size of the loess sediments in the Tibetan Plateau and strongest negative in the Chinese Loess Plateau(CLP),respectively,indicating that the 32~63 μm grain size of the dust sediments were the sensitive indicator not only for the dust storms in the CLP, but also for the seismic events in the eastern margin of the TP. The correlation between SUS and grain size during the beginning period of the seismic event in the eastern part of TP was higher than that of the ending period,indicating that the seismic event brings the fresh sediments in the study area and then decreases due to the gradual recovery of the landscape. The correlation between SUS and grain size is also influenced by the local provenance.
Shi Wei,Jiang Han-Chao. Comparison of correlation between magnetic susceptibility and grain size for lacustrine sediments in eastern Tibetan Plateau and loess deposits in Chinese Loess Plateau[J]. JOPC, 2022, 24(3): 599-610.
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