| 南大西洋热液沉积物的不同相态提取方法与元素赋存状态 |
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| 引用本文： | 张颖,杨宝菊,李传顺,王小静,汪虹敏,刘季花.南大西洋热液沉积物的不同相态提取方法与元素赋存状态[J].海洋学报,2021,43(3):90-104. |
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| 作者姓名： | 张颖 杨宝菊 李传顺 王小静 汪虹敏 刘季花 |
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| 作者单位： | 1.自然资源部第一海洋研究所，山东 青岛 266061 |
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| 基金项目： | 国家自然科学基金项目(40976038);国际海域资源调查与开发“十三五”规划项目(DY135-S2-2-03,DY135-S2-2-01);青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室开放基金资助项目(MGQNLM-KF201815);国家重点基础研究发展计划(2013CB429704)。 |
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| 摘 要： | 本文对采自南大西洋受不同程度热液活动影响的表层沉积物样品进行了元素和矿物组成分析，并对热液沉积物的碳酸盐相、Fe-Mn氧化物相和残渣态进行了一系列顺序提取实验。选用不同浓度的盐酸羟胺(HH)和醋酸(HAc)混合溶液对样品的Fe-Mn氧化物相进行提取，通过分析不同实验条件下Fe-Mn氧化物相Ti/Nd、Ti/Pb比值和Fe-Mn氧化物相、残渣态的稀土元素(REE)标准化配分模式及Ce和Eu异常值，确定了不同类型热液沉积物样品Fe-Mn氧化物相提取的理想试剂条件均为0.5 mol/L HH和25% HAc混合溶液。研究结果表明，受热液活动影响程度越高，沉积物中Fe、Cu、Zn等元素含量越高，Ca、Sr、Ba含量呈相反趋势，Mn、Pb和REE未受到热液活动明显影响；随着受热液活动影响增强，Ca、Sr、Nd在Fe-Mn氧化物相中所占比例增加，在残渣态中降低，Mn、Co、Ni和Zn呈相反趋势，Cu在碳酸盐相所占比例增加，在残渣态中降低，Pb赋存状态不受热液活动影响，主要赋存于Fe-Mn氧化物相；REE主要赋存于残渣态，沉积物受热液活动影响越明显，残留相对REE富集能力越强，残渣态REE球粒陨石标准化配分模式表现为LREE相对富集越来越不明显的特征。本文研究为进一步了解南大西洋热液沉积物特征和热液活动对沉积物元素赋存状态影响提供了方法和地球化学数据支持。
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| 关 键 词： | 南大西洋 热液沉积物 相态提取 元素赋存状态 |
| 收稿时间： | 2020-02-14 |
Sequential extraction procedure and element occurrence states of hydrothermal sediments from the South Atlantic Ridge |
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| Zhang Ying,Yang Baoju,Li Chuanshun,Wang Xiaojing,Wang Hongmin,Liu Jihua.Sequential extraction procedure and element occurrence states of hydrothermal sediments from the South Atlantic Ridge[J].Acta Oceanologica Sinica (in Chinese),2021,43(3):90-104. |
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| Authors: | Zhang Ying Yang Baoju Li Chuanshun Wang Xiaojing Wang Hongmin Liu Jihua |
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| Institution: | 1.First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China2.Key Laboratory of Marine Geology and Metallogeny, Ministry of Natural Resources, Qingdao 266061, China3.Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China |
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| Abstract: | In this study,elemental and mineral compositions of three surface sediments collected from the South Atlantic Ridge affected by hydrothermal activities of various degrees were analyzed,and series of extraction experiments for carbonate phase,Fe-Mn oxide phase and insoluble residual phase were carried out.Mixed reagent of hydroxylamine hydrochloride(HH)with different concentrations and 25%acetic acid(HAc)were used to extract Fe-Mn oxide phase from the sample.In order to corroborate the reliability of the extracting methods,Ti/Nd and Ti/Pb ratios of the Fe-Mn oxide phase,rare earth elements(REE)patterns as well asδCe andδEu ratios of different chemical phase were used to determine that the ideal reagent conditions for extracting Fe-Mn oxide phase from three different types of hydrothermal sediments were all 0.5 mol/L HH in 25%acetic acid.The results show that the higher the degree of influence of hydrothermal activities,the higher the contents of Fe,Cu,Zn and other elements in the sediments,and the contents of Ca,Sr and Ba show an opposite trend.Manganese,Pb and REE are not significantly affected by hydrothermal activities.As the influence of hydrothermal activity increases,the proportion of Ca,Sr and Nd increases in the Fe-Mn oxide phase and decreases in the residual phase,while Mn,Co,Ni and Zn have an opposite trend,and the proportion of Cu increases in the carbonate phase and decreases in the residual phase.Lead is not affected by the influence strength of hydrothermal activity and mainly occurs in the Fe-Mn oxide phase.REE mainly occur in the residue state.The occurrence state of REE shows that the more significant influence by the hydrothermal activities of the sediments,the more enrichment of REE in the residual phase.And the chondrite-normalized REE patterns of the residual phase exhibit that the enrichment of light REE are less obvious.This study provides methods for extracting hydrothermal fractions and valuable geochemical data for further understanding of the characteristics of hydrothermal sediments and the effects of hydrothermal activities on the occurrence state of elements in the South Atlantic Ridge. |
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| Keywords: | South Atlantic Ridge hydrothermal sediment sequential leaching element occurrence states |
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