Compositional characteristics of sediment from Jiaozhou Bay in North China and the implication to the provenance  

作　　者：Ziwei SUN Jin LIU Yue ZHANG Jinming SONG Yuanyuan XIAO Huamao YUAN Ning LI Xuegang LI 

机构地区：[1]College of Chemistry and Molecular Engineering,College of Marine Science and Biological Engineering,Qingdao University of Science and Technology,Qingdao 266042,China [2]Public Technology Service Center,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [3]Key Laboratory of Marine Ecology&Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [4]Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China [5]Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China [6]Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China

出　　处：《Journal of Oceanology and Limnology》2023年第5期1729-1741,共13页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China (No.41776069);the Science and Technology Innovation Project of Laoshan Laboratory (No.LSKJ202202905);the Special Project of Strategic Leading Science and Technology of Chinese Academy of Sciences (No.XDB42020302)。

摘　　要：Rare earth elements(REEs)can be used to trace source materials and identify their provenances,because of significant conservation and immobility during chemical alteration processes after erosion of materials from the provenance.This study focused on the temporal variation of REEs for columnar sediments from the mouth of Jiaozhou Bay in North China to understand the potential controls for the geochemical variations of sediments.Through extraction experiments,we identified that the residual fraction is the main host for REEs compared with other fractions(i.e.,exchangeable and carbonate fraction,easily reducible oxides fraction,reducible oxides fraction,magnetite fraction).REE ratios(e.g.,La_(N)/Sm_(N)and La_(N)/Yb_(N);N:normalized by chondrite)lack correlations with grain size or the chemical index of alteration(CIA),which is correlated with major elements.All these indicate that these REE variations reflect the varying contribution of source materials from different provenances instead of grain size or chemical weathering effects.REE ratios(e.g.,La_(N)/Sm_(N)and La_(N)/Yb_(N))remain relatively constant until the depth of roughly 40 cm(equivalent to the year 1995),and show obvious changes beyond this depth.Compared REE characteristics of Jiaozhou Bay with those of neighboring rivers and bedrocks,the relative contributions of Dagu River-Jiaolai River,and Licun River may have been increased during the sedimentary processes,which could be caused by the construction of reservoir and related change of aquaculture(e.g.,rapid accumulation of organic materials).

关 键 词：Jiaozhou Bay SEDIMENTS rare earth elements(REEs) sequential extraction PROVENANCE 

分 类 号：P736.21[天文地球—海洋地质]