REE geochemistry of surface sediments in the Chukchi Sea  

作　　者：陈志华 高爱国 刘焱光 孙海清 石学法 杨作升 

机构地区：[1]KeyLaboratoryofMarineSedimentologyandEnvironmentalGeology,StateOceanicAdministration [2]FirstInstituteofOceanography,StateOceanicAdministration,Qingdao266061,China [3]OceanUniversityofQingdao,Qingdao266003,China [4]FirstInstituteofOceanography,StateOceanicAdministration [5]OceanUniversityofQingdao

出　　处：《Science China Earth Sciences》2003年第6期603-611,共9页中国科学（地球科学英文版）

基　　金：Without their help; we cannot obtain the precious sediment samples in the study area. This article is funded by NSFC (Grant No. 49873015; 40176017); Special Foundation for the First Chinese National Arctic Research Expedition and the Youth Foundation of

摘　　要：Analyses of rare earth elements (REEs) in 26 surface sediment samples obtained from the Chukchi Sea were conducted using ICP-MS. In general, REEs are relatively rich in fine-grained sediments and deplete in coarse-grained sediments in the Chukchi Sea although REEs have large concentration spans in different types of sediments. Except that a few samples have weak en-richments of light or heavy REEs?most samples exhibit flat shale-normalized REE pattern, indi-cating that surface sediments in the Chukchi Sea are composed dominantly of terrigenous com-ponents experiencing weak chemical weathering. In terms of REE concentrations and other char-acteristic parameters, we inferred that sediments on the eastern and western sides of the Chukchi Sea are derived from landmasses of Alaska and Siberia, respectively; the midsouth sediments are possibly related to northward dispersion of the Yukon River materials. The Herald Shoal in the center of the study area is covered with relict sediment, which has large ratios of light-to-heavy REEs (ΣCe/ΣY ratio) and lacks evident negative Ce anomaly; cerium enrichment is possibly re-lated to manganese transfer under oxidizing conditions in early diagenesis.Analyses of rare earth elements (REEs) in 26 surface sediment samples obtained from the Chukchi Sea were conducted using ICP-MS. In general, REEs are relatively rich in fine-grained sediments and deplete in coarse-grained sediments in the Chukchi Sea although REEs have large concentration spans in different types of sediments. Except that a few samples have weak en-richments of light or heavy REEs,most samples exhibit flat shale-normalized REE pattern, indi-cating that surface sediments in the Chukchi Sea are composed dominantly of terrigenous com-ponents experiencing weak chemical weathering. In terms of REE concentrations and other char-acteristic parameters, we inferred that sediments on the eastern and western sides of the Chukchi Sea are derived from landmasses of Alaska and Siberia, respectively; the midsouth sediments are possibly related to northward dispersion of the Yukon River materials. The Herald Shoal in the center of the study area is covered with relict sediment, which has large ratios of light-to-heavy REEs (SCe/SY ratio) and lacks evident negative Ce anomaly; cerium enrichment is possibly re-lated to manganese transfer under oxidizing conditions in early diagenesis.

关 键 词：CHUKCHI Sea  surface sediments  RARE EARTH elements. 

分 类 号：P736.4[天文地球—海洋地质]