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2022, 41(2) 256-271 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Paleoclimate evolution during Eocenein Yilan Basin,NEChina and its indication of humidity reduction on cooling event |
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ZHANGXinrong1,2,3,LIUXiaoqi1,2,3,FANGShi1,2,3,PINGShuaifei4 , ZHANGShifeng5 ,WANGXiaoyang6 |
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1CollegeofEarthSciences,JilinUniversity,Changchun130061,China;
2KeyLaboratoryofMineralResourcesEvaluationinNortheastAsia,MinistryofNaturalResources,Changchun130061,China;
3KeyLabforOilShaleandParageneticMineralsofJilinProvince,Changchun130061,China;
4NingheDistrictofBanqiaoTownPeoplesGovernment,Tianjin301574,China;
5HeilongjiangLongmeiGeologicalExplorationCo,Ltd,Jiamusi154000,Heilongjiang,China;
6TheSixthOilProductionPlantofDaqingOilfield,Daqing163000,Heilongjiang,Chin |
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Abstract:
Thetimefrequencyandtimeseriesanalysiswereusedforthecycledivisionoftheoriginallossof ignition(LOI)dataobtainedfromtheEocenecontinoussedimentswithintheYilanBasin,NEChina.Thedynamic characteristicsoftheorganicandcarbonatecontentsindicatedbytheseLOIdatawerethenanalyzedusingthePearsoncorrelationanalysis,noisereductionfilteringandstatisticalmethods.Sixclimatetypeswereidentified:humid andhot,semihumidandhot,semidryandhot,drycold,semidryandcold,andsemihumidandcold.Asfor thetemperatureandhumiditychangesduringthemidlongtermclimatecycle,bothfactorsfirstlyincreasedtothe highestoftheentireEoceneattheendoftheEarlyEocene,thengraduallydecreasedtothelowestintheearlyof theLateEocene,andlaterlyreboundedanddecreasedslightly.Duringtheshorttermclimatecycleofthetemperatureandhumiditytransition,theauthorsfoundthetemperatureremainedunchangedwhilethehumiditydecreased continuallyduringthechangesfromanearlysynchronousequilibriumstatetoanadjacentlatestate.Thisisanimportantmarktofindwhethertheclimateisabouttoturncold.Thecomparisonswithotherresearchesshowthat,the midlongtermtemperaturechangesintheEoceneofYilanBasinwereconsistentwithotherregionsinNortheastChina,butlaggedbehindthetemperaturechangesrevealedbythedeepseaisotopes |
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Keywords:
YilanBasin
Eocene
paleoclimaticevolution
lossonignition
temperature
humidity
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Received Revised Online: |
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