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