福建九龙江河口潮滩沉积物磁性矿物时空分布特征及其沉积学意义

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中图分类号：P512.2 文献标志码：A 文章编号：2095-1329（2026）01-0036-10

PANDDWUldicestealsltsive Provinceand their sedimentary significance[J].ShanghaiLand&Resources，2026，47（1）：36-45.

doi：10.3969/j.issn.2095-1329.2026.01.005

Temporal and spatial distribution characteristics of magnetic minerals in tidal flat sediments of Jiulong River Mouth in Fujian Province and their sedimentary significance

PAN Dadong， WU Chengru， YE Jing， ZHOU Ziwei， GUO Qingyu， CHEN Yizeng， LIN Yashi， WU Shuang （SchoolofHistoryandGeography，innanNormalUniversityZhangzhou363oo，Fujian，ina）

Abstract：Becauseofthecomplexhydrodyamicconditions，itisdificulttodentifytheelaboratechracteristicsofsedientary differentiationinesarytidalfat.Teconstruconofindexsysteoftidalfatsedmentdifereiionistebasiclnktoentifythe sedimentmicrofacisadtoeveal teevolutioarytredoftidalfatIntisstudyresdimentcors wreotaiedfrothidalin the Jiulong RiverMouth inthreesedimentaryenvironments： upper tidalfat，middletidalfatandlower tidalfat，and their 137Cs dating analysis，grainsizeanalysis，androom-temperaturemagneticmeasurementswereonductedThisstudyinvestigatesthedistribution characteristicsofmagneticmineralsintidalfatsedimentsandtheiridicativesignifcanceforsdimentarydynamics.Theesultsshowed that：（1）ThetidalfatintheeastofHumaozhouIslandpresentshighdepositionrate.Thesedimentationrateofupper-midletidalfat is higherthanthatoflowertidalfatwhichismainlyinfuencedytidalwavedyamicsandvegetationpromotingsiltation.Finegrained magneticmineralsSPandSDgansareenrichedinupper-midletidalfat，whilecoarse-grainedmagneticmineralsMDand PSDgrais areeichdinlowetidalfatevealingthatmageticminralsofthetidalfatarecontrolledbyhydrodyamicsparation. The high valuesof SIRM/χ and S-20mt appear in the magnetic characteristicsof the sediments intheupper-middle tidal flat，reflecting the existence of early diagenesis. （3） There is a highly significant difference in χfd% χARM/χ and χARM/SIRM in sediments of the tidal flat. We thusproposedthatthecombinationofthesemagneticparameterscanbeusedaspotentialindicatorstodistiguishsedimentaryfacies betwenupper-middle tdalfatsandlower tidalfatinteJiulongRivermouth.Thisstudyprovidesasdimentologicalindexreference forthestudyoftidalfatevolutionandtheidentificationoftidalfatsedimentarymicrofaciesonacentury-to-decadescale.

Keywords： Jiulong River Mouth; tidal flat; sedimentary rate; magnetic mineral; sedimentary dynamics

入海河口地区接收陆源和海源物质，冰后期河口沉积的巨厚沉积物记录了海平面波动、流域气候变化和古人类活动等信息，为古环境研究提供理想的地质档案。（剩余16998字）