Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (4): 1154-1164.doi: 10.13278/j.cnki.jjuese.20170046

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Correlation Analysis of Conductivity (EC), w(FeS2), pH of Drilled Clay Water and Its Application in Paleo-Environment Restoration: A Case Study of DC01 Core on West Plain of Bohai Bay

Fang Jing1, Wang Fu2, Fang Yuting3, Pan Long1, Li Yang1, Hu Ke4, Qi Wuyun5, Wang Zhongliang6   

  1. 1. College of Geography and Environmental Science, Tianjin Normal University, Tianjin 300387, China;
    2. Tianjin Center, China Geological Survey, Tianjin 300170, China;
    3. Graduated School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan;
    4. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China;
    5. Institute of Archaeology, Chinese Academy of Social Sciences, Beijing 100710, China;
    6. Tianjin Key Laboratory of Water Environment and Resources, Tianjin Normal University, Tianjin 300387, China
  • Received:2017-11-07 Online:2018-07-26 Published:2018-07-26
  • Supported by:
    Supported by National Natural Science Foundation of China(41476074),Project of China Geological Survey(121201006000182401),Doctoral Fund of Tianjin Normal University(52XB1207) and Innovation Team Training Plan of Tianjin Education Committee (TD13-5073)

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Abstract: In order to explore the effective method for the reconstruction of the ancient environment of coastal plains and accurately divide the marine and continental stratum, the core DC01(30 m depth) was taken from the south of the Haihe River in the west plain of the Bohai Bay,and sampled at intervals of 20 cm;The electric conductivity (EC), w(FeS2) and pH were measured, and the correlations between EC and pH, w(FeS2) and pH were analyzed. The results show that EC is positively correlated with w(FeS2) (r=0.47), while EC is negatively correlated with pH, and so is w (FeS2) (r=-0.43 and -0.52, respectively). According to the EC value, the core DC01 was divided into five bands from bottom to top, and the correlations between EC, w(FeS2) and pH were further analyzed. The results show that the correlation of band Ⅱ is most obvious, and its EC is positively correlated with w(FeS2) (r=0.83), but strongly negatively correlated with pH(r=-0.77), while w(FeS2) is moderately negatively correlated with pH (r=-0.45). According to the strong positive correlation between EC and w(FeS2), the high EC, w(FeS2) and abundant black peat and humus clay, we can infer that the band Ⅱ was developed in a salt marsh environment close to the seawater. Combined with the AMS14C dating result, seawater once affected this position during the period of 8 260-7 470 cal. B. P. In band Ⅳ, the EC is high, but w(FeS2) is very low, and the correlation between EC and w(FeS2) is negative(r=-0.03), such a pattern was caused by the leaching effect of the upper surface sediments. The uppermost band Ⅴ(6.7 m on top) is a leaching layer, therefore its correlation between EC and w(FeS2) is abnormal. Obviously, a comprehensive analysis of EC and w(FeS2) can give a more reliable result for the discussion of the upper sedimentary environment of a drilling core.

Key words: coastal lowland of west Bohai bay, caly-water electric conductivity, pyrite content, pH, correlation analysis, sedimentary environment

CLC Number: 

  • P736.2
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