Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (2): 465-479.doi: 10.13278/j.cnki.jjuese.20190250

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Characteristics of Magnetic Susceptibility, Grain Size and Chromaticity of Modern Sediments in the Southern Margin of Songnen Plain and Their Paleoclimate Environment Significance

Zhang Xinrong1,2,3, Ping Shuaifei1,2,3, Jiao Jieyu1,2,3, Liu Enhao1   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Key Laboratory for Evolution of Past Life and Environment in Northeast Asia(Jilin University), Ministry of Education, Changchun 130026, China;
    3. Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province, Changchun 130061, China
  • Received:2019-11-26 Online:2020-03-26 Published:2020-03-31
  • Supported by:
    Supported by National Natural Science Foundation of China (41371202) and Students Innovative Training National Project of Jilin University(2018A2208)

Abstract: A better understanding of the Quaternary paleoclimate process in Songnen plain is of great theoretical significance for the study of the climate-influencing factors on the black soil degradation in this area. Seven sediments sections were collected from Guojia (GJ), Wangou (WG), Pingantun (PA), Yaofenshuiling (YP), Xidi (XD), Hujiadian (H),and Xiaojia (XJ) in the Changchun-Siping segment of Daheishan horst, the south margin of Songnen plain. The magnetic susceptibility, grain size,and chromaticity analyses indicate that the magnetic susceptibility of sediments is mostly characterized by increasing during drying or cold period,and decreasing during wet or warmer period. The color has a great influence on the magnetic susceptibility. The magnetic susceptibility of reddish brown sand or sandy clay is higher than that of light yellow or grayish green sand or sandy clay; while the magnetic susceptibility of light yellow or grayish green sand or sandy clay is higher than that of grayish black sand or sandy clay. The presence of carbonate or limestone in the source area makes the relationship between sediment chromaticity and magnetic susceptibility relatively complex. On the studied profiles, the magnetic susceptibility increases with the increase of grain size. Freeze-thaw or rainy can increase the grain size, and cause high magnetic susceptibility, however, in a warmer period, the magnetic susceptibility is reduced by the decrease of source supply. The three indicators comprehensively reflect that the seven sections experienced a paleoclimate environment process of a cold and dry in Early Pleistocene, cold and wet-warm and wet-cold and dry in Middle Pleistocene, and cool and wet in Late Pleistocene.

Key words: magnetic susceptibility, grain size, chromaticity, paleoclimate environment, the southern margin of Songnen plain

CLC Number: 

  • P532
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