山东半岛东北部滨浅海区表层沉积物特征和沉积作用

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1、surficialsediments．Atthesametime，claymineralcompositionsofthesuspensionsfromboththeYangtseRiveandtheYellowRiverwereanalysedrespectivelyforcomparison．TheresultshowsthattheclaymineralcompositionofthestudyareaisconsistentwiththatofYellowRiversuspension．Clasticmineralsofthe30samplesarecharacterized

2、byhigherinstablemineralandflakymineral．Heavymineralscallbedividedintotwogroups，i．e．anphibole-epidotegroupandflakymineral—autogeneticpyritegroup．Thetwogroupsoccurindifferentsedimentaryenvironments，incloserelationtotheYSCC，reflectingstrongerandweakerdynamicconditionsrespectively．Chemicalanalysisw

3、asmadeforthemajorelementincludingK，Na，Ca，Mg，AI，Fe，P，Si，SandCIandtraceelementincludingBe．Sc，Ti，V，Cr，Mn，Co，Ni，Cu，Zn，Ga，Sr，Zr，Nb，Mo，Ba，Hf,Ta，Pb，Th，UandnEE，suchasLa，Ce，Pr，Nd，Sm，Eu，Gd，Yb，Dy，Ho，Er，Ym，Yb，LuandYofthe241samplesfromthestudyareabyusingX—rayFluorescenceSpectrometerandInductivelyCoupledPlas

4、ma-MassSpectrometer．MajorelementK，Fe，MgandAIshowpositivecorrelations．TransitionelementCr,Fe，Co，NiandZnshowevenbettercorrelation，whereasMn，CuandZrexhibitpoorcorrelationwithotherelements，revealingtheirspecifcgeochemicalcharacter．Wecomparedtheuppercontinentalcrust(UCC)normalizedREEpatternsbetweent

5、hesamplesandthesamplesfromYangtse●，’’4Rive，YellowRiverandotherriversaroundtheYellowSea．TheresultshowsthatUCC·normalizedREEpatternofsamplesfromthestudyareaismuchmoresimilartothatofYellowRiversediments，buttheabsoluteabundanceofREEinthestudyareaisslightlyhigherthanthatofYellowRiversedimentsprobabl

6、yowingtotheeffectsof‘‘grainsize”andthecontributionofYellowSeaColdWaterandYellowSeaWarmCurrent，whichcounldbringfineparticlesoriginatedfromYaluRiverandYangtseRiveintothestudyarea．Keywords：offshoreofnorth—easternShandongPeninsula：grainsize：miheralcompositiORS：geochemicaIcharacteristicaofelements：p

7、rovenanceofsediment：YeIIOWSeaCoastaICurrent山东半岛东北部演浅海区表层沉积物特fil!SI沉积作用前言陆架区是海陆作用交会的区域，历来是地学界研究的热点区域之一，探讨其沉积规律和成因，对我们认识海陆的变迁和演化具有极其重要的意义。1陆架沉积研究现状世界陆架沉积的研究大致经历了3个阶段，总结出3种成因模式：最早，Johnson于1919年认为陆架水体与海床是一个动力“t衡体系，陆架上每个部位的沉积物粒径大d,矛FI地