天山黄土磁化率增强机制初步研究（英文）

天山黄土磁化率增强机制初步研究（英文）Preliminary Study on the Mechanism of Enhanced Magnetic Susceptibility in Tiansha

天山黄土磁化率增强机制初步研究（英文） PreliminaryStudyontheMechanismofEnhancedMagnetic SusceptibilityinTianshanLoess Introduction: TianshanLoessisatypicalaeoliandepositincentralAsia, mainlydistributedinthenorthwesternregionofChina.Asoneof themostimportantstratigraphicarchives,TianshanLoesshas beenwidelyusedtoreconstructthepaleoenvironmentand Quaternaryclimatechange.Magneticsusceptibilityisapowerful proxyforidentifyingtheenvironmentalandclimaticchanges recordedinTianshanLoess.Inrecentstudies,itwasfoundthatthe magneticsusceptibilityofTianshanLoessissignificantly enhanced,whichmayberelatedtochangesintheenvironmental factorsandthemagneticmineralcomposition.However,the mechanismofmagneticsusceptibilityenhancementinTianshan Loessisnotyetfullyunderstood. EnvironmentalFactors: Environmentalfactorscanhaveasignificantimpactonthe magneticpropertiesofloess.Previousstudieshavefoundthatthe levelofprecipitationandthevegetationcoverhaveanimportant influenceontheformationandpreservationofthemagnetic minerals.IntheTianshanLoessarea,thedecreaseinprecipitation andthedecreaseinvegetationcoverageduringtheglacialperiod contributetothedecreaseinthelevelofweathering,whichis conducivetothepreservationofprimarymagneticminerals. MagneticMineralComposition: ThemagneticmineralsinTianshanLoessmainlyinclude hematite,magnetite,andotherironoxides.Thesemineralshave differentmagneticproperties,andthechangeintheircontentand distributioncanaffectthemagneticsusceptibilityoftheloess. Studieshavefoundthatthecontentoffine-grainedmagnetic mineralsinTianshanLoessishigherthanthatinotherloess regions,whichindicatesthatthemagneticsusceptibilityof TianshanLoessismoresusceptibletochangesinthecomposition anddistributionofmagneticminerals. TheMagneticEnhancementMechanism: