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《普里兹湾表层沉积物粒度、矿物特征与晚第四纪古海洋学记录-(5916)》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、摘要关键词：东南极；普里兹湾；表层沉积物；岩芯；物源；古海洋学记录IIIAbstractCharacteristicofgrainsize,mineralsinsurfacesedimentsandpaleoceanographicrecordssincelateQuaternaryofPrydzBayAbstractPrydzBayisthelargestbayinEastAntarctica,itliesintheIndiansectorofSouthernOcean.Tosouth,itconnectsLambert-AmeryIce
2、ShelfwhichisakeyareatounderstandtheEastAntarcticIceSheetdynamicandrevealtheinteractionsbetweenseaandice.InthethesissurfacesedimentsofPrydzBayandsedimentcoreP4-01gainedfromcontinentalslopeofthebayawereanalysized,wedisscussedthecharacteristicofgrainsize,mineralsandtheirimpli
3、cationstosedimentprovenance;theevolutionofnearly520kyrpaleoceanographyicfeaturesinthenortherncontinentalslopeofthebaywerealsodiscussed,andseveralconclusionswereasdrawnasfollows:(1)Constrainedbywaterdepth/topography,currentsandicebergs,sedimentenvironmentdifferesbeyweendiff
4、erentsectorsofthebay.Theshelfareacanbesubdividedintotwosectors.InsectorⅠ,includingFramBank,areainfrontofAmeryIceShelf,CapeDarnley(BurtonBasin)andFourLadiesBank,sedimentcontainsmoregravel,sandandIceRaftedDetritus.SedimentsupplyisobviouslyinfluencedbyAmeryIceShelfandtidalgla
5、ciers,currents,icebergs,andtheirtransportroutineinthebay.InsectorⅡ,includingAmeryBasin,PrydzChannelandSvennerChannel,sedimentscontainmoresilt,whilesandandgravelcontentisless,andsedimentationisinfluencedbywaterdepth,currents.Particularly,sedimentinAmeryBasin,centerofPrydzBa
6、yGyre,containsmorefineparticlesandiswellsorted.Sedimentationisaffectedbybottomcurrents,AntarcticSlopeCurrent,gravityflow,materialexchangesbetweencontinentalshelfandcontinentalslopeandicebergs.(2)Heavymineralcontentsofsurfacesedimentsshowadecreasingtrendfromeasttowestintheb
7、ay.HigheramphibolecontentinsedimentsofFourLadiesBankmayderivefromtheorthogneiss,whichcontainsmoreamphiboleinPrincessElizabethI普里兹湾表层沉积物粒度、矿物特征及晚第四纪古海洋学记录Land;andtheoutcropsinPrinceCharlesMountains,whichismainlyamphibolefaciesgneiss,suggestsedimentinfrontofAmeryIceShelfpart
8、lyderivefromthetransportofLambert-AmeryIceShelfsystem.InFramBank,amphibolecontentishigher
