ISSN 1002-1027  CN 11-2952/G2

Acta scientiarum naturalium Universitatis Pekinensis

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Paleoclimatic Events from 40 to 46ka B.P. Based on Stalagmite Records in Eastern Chongqing, China

DONG Mingxing1, LUO Kunli1, CHEN Qiao1, LI Shuwen2, YE Chengli2, LIU Qiang2   

  • Received:2005-05-12 Online:2006-03-20 Published:2006-03-20

Abstract: The w(Mg)/w(Sr) ratio in a stalagmite, which is directly proportional to DMg/Ca, the solid-liquid distribution coefficient of Mg, is proposed as a geochemical thermometer to estimate paleoclimatic changes. The palaeoclimatic changes in Eastern Chongqing in the last glaciation from 46 to 40kaBP have been reconstructed by using this thermometer in stalagmite(No. ZNSD17) from Furong Cave, Wulong county. The climate changes can be divided into three periods: warm(46-44.6kaBP), cool and wet(44.6-40.6kaBP), hot and dry(40.6-40kaBP). A high resolution between 51 and 135 years of w(Mg)/w(Sr) thermometer clearly displays a cool event (Heinrich Event 4) occurring in 41.42kaBP and 3 warm events (IS8, IS9 and IS10) occurring at 40, 45, and 45.7kaBP respectively. These results are well correlated with the preceding data within the range of errors.