J4 ›› 2010, Vol. 40 ›› Issue (5): 1066-1074.

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Reconstruction of the Paleo-Environment in Changchun Area, Northeast China during the Late Mid-Pleistocene:Evidences from Sedimentary Geochemistry and Palynology

WANG Dan-ping1,2|WANG Xi-kui2,JIANG Yu-biao3   

  1. 1.School of Ocean and Earth Sciences,Tongji University,Shanghai 200092,China;
    2.College of Earth Sciences,Jilin University,Changchun 130061,China;
    3.Zhejiang Institute of Geophysical Exploration,Hangzhou 310005,China
  • Received:2010-01-20 Online:2010-09-26 Published:2010-09-26

Abstract:

On the basis of TL dating and grain size analysis of the Core HDBZK-1 samples in the Changchun Area, the authors employ K2O, Na2O, MgO, CaO, Al2O3 and their ratios, K2O/Na2O and Al2O3/(Al2O3+CaO+Na2O), which are sensitive to environmental changes, combined with pollen analysis, to analyze the climate environment change of the Changchun area during the late Mid-Pleistocene (probably from 280 to 120 kaB.P.). The results show that the Changchun area has experienced four distinctive cold-dry and warm-wet paleo-climate changes during the late Mid-Pleistocene: cold and dry (281.6-244.0 kaB.P.)-moderate warm and slightly wet (244.0-215.0 kaB.P.)-cold and dry (215.0-131.8 kaB.P.)-the climate turned warm and wet again, with an obvious sign of a sudden increase of freshwater algae (131.8-126.4 kaB.P.), which probably comply with the climate cycles reflected by deep-sea oxygen isotope curves.

Key words: geochemistry, pollen, paleo-climate changes, Late Mid-Pleistocene；Changchun area

CLC Number: 

  • P595
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