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《曹妃甸近岸海域表层沉积物粒度特征及其沉积环境.pdf》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、矿物岩石地球化学通报·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVo1.35No.3,May,2016曹妃甸近岸海域表层沉积物粒度特征及其沉积环境刘宪斌,李孟沙,梁梦宇,李德亮,刘春琳天津科技大学,天津市海洋资源与化学重点实验室,天津300457摘要:为探讨河北曹妃甸人工填海对近岸海域沉积环境及水动力条件的影响,对该区沉积物粒度特征进行了研究。利用LS13320系列激光粒度分析仪对13个站位沉积物粒度进行测试,分析了其粒级组成与特征参数。结果表明,研究区分为3个岩性区:北部海域潮间带沉积物以砂
2、质粉砂为主;中部工业区周围海域沉积物偏粗,以粉砂质砂为主;南部沿岸海域沉积物较细,以黏土质粉砂为主。沉积物平均粒径介于2.94~6.87中,粒级组分为黏土、粉砂和砂,质量分数平均值分别为18.16%、52.30%和29.53%。粒度频率曲线偏态.s为0.07~0.81,峰态K为0.63~2.21,自北向南,由单峰逐渐过渡为主峰或弱峰,与2007年人工填海初期沉积环境相比,沉积物类型变单一、组分粗化,表明人工填海工程对曹妃甸近岸海域沉积环境是有影响的。关键词:曹妃甸;沉积物;沉积环境;人工填海;粒度分析中图分类号:P736.21文章编号: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.averageg
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
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