末次冰期旋回柴達木盆地西北部湖泊沉積記錄的環(huán)境演化.pdf

1、蘭州大學碩士學位論文末次冰期旋回柴達木盆地西北部湖泊沉積記錄的環(huán)境演化姓名：李遠平申請學位級別：碩士專業(yè)：自然地理學指導教師：楊太保20050501—蘭型奎鱟塑主里些堡苧查盜鯊塑壁墮鱉竺查笙些墮j!塑塑塑塑塑望莖塑堡墮塑垡AbstractQaidanaBasinisalargescaleinlandaridbasinintheNortheastofQinghai—TibetPlateauTheBasinisverysensitiveto

2、globalclimaticchangeowingtoitslocationjnstattheboundarybetweenthemiddlelatitudewesterlywindandtheeastAsianmonsoonsystemFollowedbythestrongandgrandraiseofQinghaiTibetPlateauinlateCenozoic，thebasinhasdepositeddeep，continuo

3、usandstablesedimentswhichmakeitallidealtargetforstudyingQuaternarypaleoenvironmentalandpaleoclimaticchangesItisofgreatscientificsignificanceforusthroughanalysisofhigh—resolutionclimaticproxiesoflakecoreintheQaidamBasinte

4、constructclimaticchangeoverthelastGlacial—Interglacialcycleinthisregion，tounderstandhowtheBasinrespondstoglobalclimaticchangesignalandregionalclimaticchange’scharacteristic，toprobeintothedrivingforcesandtheinteractionmec

5、hanismsthataccountfortheQaidamBasinclimatefluctuationsincethelastGlacial—InterglacialcycleWeestablishedthetimescaleofGSK222corelocatedinGasHureLakeinnorthwesternmarginofQaidamBasinthroughcomparingGSK222climaticproxy、^，it

6、htheSPECMAPoxygenisotopeC11rveOnthebasisofclimaticproxyrecordwereconstructpaleoenvironmentalandpaleoclimaticchangesinNorthwesternQaidamBasinsincethelastGlacial—InterglacialcycleaccuratelyandparticularlyInclimaticrecordof

7、GSK222corethetrendofclimaticchangeisevidentHeventsandD—OcyclesexistoverthelastglaciationClimaticrapidfluctuationsoverthelastinterglacialandtheHolocenearedominatedbythelkaand2kaperiodicityLateMIS3takesonunusuallyWalTnperi

8、od，whilethereismarkedtrendofdry—coldsince30kaBPTheGSK222coreclimaticrecordwhichembodies20kaand40kacyclesisinaccordancewiththeinsolationat650NinJulyillustratinginsolationchangeistheinitialexteriorastronomicalfactordriving