Resolving the hydrothermal signature by sequential leaching studies of sediments from the middle of the Okinawa Trough

作     者：YU ZengHui GAO YuHua ZHAI ShiKui LIU FeiFei 

作者机构：Key Laboratory of Submarine Geosciences and Prospecting TechniquesCollege of Marine GeosciencesOcean University of ChinaQingdao 266100China Shandong Institute of Geophysical and Geochemical ExplorationJinan 250013China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2012年第55卷第3期

页      面：665-674页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：supported by National Natural Science Foundation of China (Grant No.40306009) 

主　　题：热液活动 冲绳海槽 沉积物 碳酸盐结合态 金属离子浓度 锰氧化物 金属含量 签名 

摘      要：A sediment core H9 collected from the middle of the Okinawa Trough was studied by sequential leaching to indentify the hydrothermal component from the various other components such as detrital,biogenic,and so *** elements were partitioned into five fractions:exchangeable,bound to carbonates,bound to iron and manganese oxides,bound to organic matter,and *** contents of elements Al,Ti,K,Fe,Mn,Pb,Co,Cu,Ni,and V in each fraction were determined and their percentages were *** fraction is a dominant speciation for most studied elements except for Mn and Pb in the core *** the elements Al,Ti,and K,residual fraction accounts for more than 95% of the total metal *** concentrations of all studied elements in the exchangeable fraction,carbonate fraction,and organic fraction are relatively *** metal levels in the iron and manganese oxide fraction are relatively high and this fraction represents another prevalent *** in this fraction,the metal concentrations and percentages are higher in the core section above 80 cm than those below 80 *** for Mn and Pb,the fractions bound to iron and manganese oxides account for more than 50% of the total metal concentration for the upper 80 cm *** components mainly occur in this *** the downcore variations of metal contents and percentages reflect the variations of hydrothermal inputs to the *** high metal levels in the upper core indicate the enhancing influence of hydrothermal activities around on the core H9 during its late stage of *** accumulation rates of hydrothermally derived Fe,Mn,Pb,Co,Cu,Ni,and V were evaluated based on their concentrations in the iron and manganese oxide fractions in this *** results show that the accumulation rate of hydrothermally derived Mn is similar to those obtained from the Mid-ocean Ridges and Lau ***,hydrothermally derived Fe and Cu present a relatively lower level