Sediments are the products influenced by multiple factors(such as,provenance,depositional environment,and biogenic process),different elements enter sediments in dif-ferent ways,resulting in their occurrence in different fractions.By studying the elements a-bundance and isotopic compositions of sediments,it can reveal biology,physical and chemi-cal information obscured by the mixing of various processes.In this study,the sediments of Jiaozhou Bay were fractionally extracted,including carbonate combined fraction,easily re-ducible oxide fraction,reducible oxide fraction,magnetite fraction and residual fraction.The results of element content in different fractions show that the major elements are mainly present in the residual fraction,but Ca,Fe,Mg,Mn and P are present in the non-residual fractions to varying degrees.Combined with the common mineral compositions in the sedi-ments of Jiaozhou Bay,in addition to the target mineral compositions of different fractions introduced in previous studies,it is speculated that the potential minerals in the easily reduc-ible oxide fraction may include monazite and apatite.The potential minerals in the reducible oxide fraction may include limonite.The potential minerals in the magnetite fraction may in-clude ilmenite.Some silicate minerals also exist in easily reducible oxide fraction and reduci-ble oxide fraction.The residual fraction is enriched with heavy iron isotope,inheriting the characteristics of the provenance area,and the iron isotope of the total fraction is mainly con-trolled by the residual fraction.The iron isotope of the active iron fraction is affected by the non-terrestrial compositions.
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