SCIENTIA GEOGRAPHICA SINICA ›› 2007, Vol. 27 ›› Issue (3): 385-389.doi: 10.13249/j.cnki.sgs.2007.03.385

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Magnetic Susceptibility and Rb/Sr Ratio of Peat Stratum in Tiantangzhai and Its Significance of Palaeoclimate

HUANG Run1,2, ZHU Cheng2, WANG Sheng-Tang1   

  1. 1. Department of Urban Construction and Environmental Science, Wanxi College, Lu’an, Anhui 237012;
    2. College of Geography and Marine Science, Nanjing University, Nanjing, Jiangsu 210093
  • Received:2005-12-08 Revised:2006-04-09 Online:2007-05-20 Published:2007-05-20

Abstract: A typical peat profile of Tiantangzhai in the Dabie Mountains was chosen for this study.The vertical distribution of magnetic susceptibility and Rb/Sr elements in the sediments of the profile was determined.Its implication for the palaeoclimatic change of the north subtropics in the Holocene were discussed.By means of magnetic susceptibility and Rb and Sr concentration analyses, combined with 14C dating,regional palaeoclimatic changes were divided into five periods since the middle and late Holocene:(1) warm-wet period of 5700-5050 cal.a B.P.;(2) warm-dry period of 5050-4300 cal.a B.P.,and during which climate fluctuated acutely,druing which abrupt climatic change occurred in 4600-4500 cal.a B.P.;(3) relatively cool-wet period of 4300-1400 cal.a B.P.,climate fluctuated gently;(4) relatively warm-dry period of 1400-800 cal.a B.P.;(5) cool-dry period from 1400 cal.a nowadays,but temperature ascends again in modern times.Magnetic susceptibility and Rb/Sr ratio can be used as palaeclimatic proxy to identify peat records.Low magnetic susceptibility and Rb/Sr ratio indicate cool-dry climate condition,by contraries,high magnetic susceptibility and Rb/Sr ratio indicate warm-wet climate condition.

Key words: peat, magnetic susceptibility,Rb/Sr ratio, palaeoclimate, Tiantangzhai

CLC Number: 

  • P532