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Volume 19 Issue 1
Feb.  2008
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Sedimentation Geochemistry and Environmental Changes during the Late Pleistocene of Paleolake Qarhan in the Qaidam Basin

  • Received Date: 2018-07-15
  • OnthebasisoftheanalysesofTOC,CaCO3,δ13Corg,δ18O,andδ13CoftheshellbarsectionintheQaidambasin,andcomparedwithgrainsizedata,theenvironmentalchangehistoryofthehighwaterlevelofpaleolakeQarhanwasreconstructedanditcouldbedividedintofivestages.From39.7to35.8kaBPwasthedevelopmentperiodofhighpaleolakelevel.From35.8to33.6kaBPand33.6to27.2kaBP,TOCandCaCO3contentsandδ18Ovalueswerehigh,whereas,δ13Corgvaluesandmediansizecontentwerelow,reflectingawarm-humidclimateandhighlakelevel.During27.2–22.3kaBPand22.3–17.5kaBP,bothtemperatureandthelakelevelwerelowerthanthoseinthepreviousstages,buttheclimatewasstillwarmerandmorehumidthanthatoftoday.Thelakeleveldecreasedbetween32.4and32.2kaBP,30.4and29.8kaBP,and28.4and27.2kaBP.Generally,theclimatewaswarmandhumidinQaidambasinandthehighlakelevelsustainedbetween39.7and17.5kaBP.Thelakeretreatedabruptlyat17.5kaBP,withaverystrongincreaseinevaporation,whichresultedinsaltformationandtheextinctionofCorbicula.
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通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Sedimentation Geochemistry and Environmental Changes during the Late Pleistocene of Paleolake Qarhan in the Qaidam Basin

  • 1. Key Laboratory of Western China’s Environments

Abstract: OnthebasisoftheanalysesofTOC,CaCO3,δ13Corg,δ18O,andδ13CoftheshellbarsectionintheQaidambasin,andcomparedwithgrainsizedata,theenvironmentalchangehistoryofthehighwaterlevelofpaleolakeQarhanwasreconstructedanditcouldbedividedintofivestages.From39.7to35.8kaBPwasthedevelopmentperiodofhighpaleolakelevel.From35.8to33.6kaBPand33.6to27.2kaBP,TOCandCaCO3contentsandδ18Ovalueswerehigh,whereas,δ13Corgvaluesandmediansizecontentwerelow,reflectingawarm-humidclimateandhighlakelevel.During27.2–22.3kaBPand22.3–17.5kaBP,bothtemperatureandthelakelevelwerelowerthanthoseinthepreviousstages,buttheclimatewasstillwarmerandmorehumidthanthatoftoday.Thelakeleveldecreasedbetween32.4and32.2kaBP,30.4and29.8kaBP,and28.4and27.2kaBP.Generally,theclimatewaswarmandhumidinQaidambasinandthehighlakelevelsustainedbetween39.7and17.5kaBP.Thelakeretreatedabruptlyat17.5kaBP,withaverystrongincreaseinevaporation,whichresultedinsaltformationandtheextinctionofCorbicula.

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