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1、礦物巖石地球化學(xué)通報·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVo1.35No.3,May,2016曹妃甸近岸海域表層沉積物粒度特征及其沉積環(huán)境劉憲斌,李孟沙,梁夢宇,李德亮,劉春琳天津科技大學(xué),天津市海洋資源與化學(xué)重點實驗室,天津300457摘要:為探討河北曹妃甸人工填海對近岸海域沉積環(huán)境及水動力條件的影響,對該區(qū)沉積物粒度特征進(jìn)行了研究。利用LS13320系列激光粒度分析儀對13個站位沉積物粒度進(jìn)行測試,分析了其粒級組成與特征參數(shù)。結(jié)果表明,研究區(qū)分為3個巖性區(qū):北部海域潮間帶沉積物以砂
2、質(zhì)粉砂為主;中部工業(yè)區(qū)周圍海域沉積物偏粗,以粉砂質(zhì)砂為主;南部沿岸海域沉積物較細(xì),以黏土質(zhì)粉砂為主。沉積物平均粒徑介于2.94~6.87中,粒級組分為黏土、粉砂和砂,質(zhì)量分?jǐn)?shù)平均值分別為18.16%、52.30%和29.53%。粒度頻率曲線偏態(tài).s為0.07~0.81,峰態(tài)K為0.63~2.21,自北向南,由單峰逐漸過渡為主峰或弱峰,與2007年人工填海初期沉積環(huán)境相比,沉積物類型變單一、組分粗化,表明人工填海工程對曹妃甸近岸海域沉積環(huán)境是有影響的。關(guān)鍵詞:曹妃甸;沉積物;沉積環(huán)境;人工填海;粒度分析中圖分類號:P736.21文章編號:1007—28
3、02(2016)03—0507—08doi:10.3969/j.issn.1007—2802.2016.03.014GrainSizeFeaturesandSedimentaryEnvironmentofSurficiaiSedimentsintheCaofeidian0ffshoreAreaLIUXian—bin,LIMeng-sha,LIANGMeng·yu,LIDe—liang,LIUChun-linTianjinKeyLaboratoryofMarineResourcesandChemistry,TianjinUniversityofScie
4、nce&Technology,Tianfin300457,ChinaAbstract:Inordertoexploretheinfluenceofartificialreclamationtothesedimentaryenvironmentandhydrodynamiccon-ditionoftheCaofeidianofshorearea,HebeiProvince,grainsizefeaturesofsurficialsedimentsintheareahavebeenstudiedinthispaper.Thecompositionandc
5、haracteristicparametersofgrainsizeofsurficialsediments,whichwerecol-lectedfrom13stationsintheCaofeidianofshorearea,havebeenanalyzedbyusingaLS13320LaserDiffractionParticleSizeAnalyzer.Resuhsshowthatthreezoneswithsurficialsedimentsofdifferentgrainsizescanbeoutlinedinthestudyar-ea
6、.Therearemainlysandysihintertidalsedimentsinthenorthernpartofthearea.Therearemainlysiltysandsedimentsinthecentralpartwhereisclosetotheindustrialzone.However,therearemainlyfineclayeysiltsedimentsinthesouth—ernpartofthearea.Thesedimentshaveaverageparticlesizesof2.94~6.87.a(chǎn)verageg
7、rainmassfractionsof18.16%forclay,52.30%forsilt,and29.53%forsand,respectively.Fromnorthtosouth,thefrequencycurveofgrainsizesischangedfromsinglemodetomainorsecondmodegradually,withS“valuesof0.07~0.81andKvaluesof0.63—2.21.Comparingtothesedimentsinearly2007beforetheartificialreclam
8、ation,therecentsedimentsarerelativelysingleincompositi