青海天峻木里凍土區(qū)末次冰期以來的氣候變化研究

1、中國地質(zhì)大學(xué)（北京）碩士學(xué)位論文青海天峻木里凍土區(qū)末次冰期以來青海天峻木里凍土區(qū)末次冰期以來的氣候變化研究的氣候變化研究學(xué)號：研究生：專業(yè)：地理學(xué)研究方向：全球變化與區(qū)域響應(yīng)指導(dǎo)教師：年月AbstractThispaperseclectedthequaternarystratigraphicinMulipermafrostaeraofTianjuncountyofQinghaiProvinceasresearchobjectwhichi

2、sinthentheastofQinghaiTibetPlateauadjacenttothesouthofQilianMountain.Onthebaseofpreviousstudiesthispapertooksomeanalysisaboutparticlesizemagicsusceptibilitypaleotemperaturecomparedtheacteristicsofthemwiththepaleooxygenis

3、otopestagesinGuliyaIceCesince50ka.BP.ThenthispaperrehabilitatestheprocessevolutionofclimatechanginginresearchareasincelastglacialageofLatePleistocene.themainconclusionsareasfollows:1.Thequaternarystratigraphicinresearcha

4、reaincludestheupperLedufmationofLatePleistocenestratigraphicalltheHolocenestratigraphic.TheageoftheboundarybetweentheupperLedufmationthebedrockwhichisbelowitisabout44.84kaBP.theageoftheboundarybetweentheupperLedufmationt

5、heHolocenestratigraphicinwhichliesagraybrownclaycontaininggravelisabout11.37kaBP.2.Thepaleoclimatesedimentaryenvironmentofresearchareahavethreestagessincelastglacialage.Themostoldwarmstageisainterglacialageoflastglaciala

6、gebetweentheage44.84kaBP31.54kaBP.Inthisstagethefemostsedimentaryfaciesisoutwashflooddepositions.Theparticlesizeisthickerthevalueofmagicsusceptibilitypaleotemperatureisgreaterthantheothers’s.Duringthisstageclimatefluctua

7、tedhadaabnmalwarmeventwhichleadedtoagreaterspeedofsedimentary.ThenitcamethecoldeststagewhichiscalledtheLastGlacialMaximumLateGlacialdatingageisbetween31.54kaBP11.32kaBP.Thefemostsedimentaryfaciesisoutwashwithsomeacterist

8、icsoffluvialdepositsmeaningthatthisstagehadaweakunstabletransptationpower.Fineparticlescompositionincreaseswithasignificantreductionofthevalueofmagicsusceptibilitypaleotemperature.ButduringthelaterperiodofLateGlacialthep