Sr-Nd isotopic characteristics and their significance in provenance tracing of detrital sediment in major rivers and marginal seas of eastern China  

作　　者：Xiaobao GAO Chao LI Zhifei DUAN Yulong GUO Shouye YANG 

机构地区：[1]State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China

出　　处：《Science China Earth Sciences》2025年第2期523-537,共15页中国科学(地球科学英文版)

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFF0800504);the National Natural Science Foundation of China(Grant Nos.42273057,42076063);the Natural Science Foundation of Shanghai(Grant No.21590712700)。

摘　　要：Sr-Nd isotopes are widely utilized as reliable tracers in sediment provenance studies.In this study,we compiled 304 Sr and 335 Nd isotope data of fine-grained surface sediments collected from major rivers in eastern China,including the Huanghe River,Changjiang River,southeastern coastal rivers,and rivers in Taiwan Island,as well as from marginal seas(Yellow Sea and East China Sea)and the Okinawa Trough.This comprehensive dataset allowed us to examine the spatial distribution patterns of these isotopes and their implications for provenance analysis.The variations ofεNd values in the sediments in Changjiang and Huanghe Basins primarily reflect the diversity of sediment sources,whereas the^(87)Sr/^(86)Sr ratios are influenced by both grain size and source provenance.Moreover,the reduction in^(87)Sr/^(86)Sr ratios observed in the middle and lower Changjiang River is attributed to the inputs of sources characterized by distinct^(87)Sr/^(86)Sr signatures beyond mere grain size effects.In the southeastern coastal and Taiwan rivers,sediments in the tidal reaches of the Jiao River exhibit hybrid characteristics,a mix of Changjiang-derived sediment and those originating from local catchments.Conversely,the Min River and Jiulong River sediments predominantly reflect local sources,with minimal influence from the Changjiang River.The significant isotopic variation of Sr-Nd isotopic characteristics observed between riverine sediments on the eastern and western sides of Taiwan Island underscores the diverse provenance heterogeneity of source rocks in the region.For the marginal seas,our data indicates that the surface sediments in the central mud area of the South Yellow Sea and the southern Yellow Sea are predominantly sourced from the Changjiang River catchment,potentially augmented by inputs from Korean rivers.The inner shelf sediments of the East China Sea are primarily influenced by Changjiang River inputs,whereas rivers in eastern Taiwan Island contribute to the sediments on the middle and outer shelves.Overall,the sedim

关 键 词：Sr-Nd isotope Provenance tracing Detrital sediments Eastern China rivers Marginal seas 

分 类 号：P73[天文地球—海洋科学]