| 东马努斯海盆PACMANUS热液区Si-Fe-Mn-羟基氧化物的Sr、Nd、Pb同位素特征 |
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| 引用本文： | 杨宝菊,曾志刚,王晓媛.东马努斯海盆PACMANUS热液区Si-Fe-Mn-羟基氧化物的Sr、Nd、Pb同位素特征[J].海洋学报(英文版),2015,34(8):27-34. |
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| 作者姓名： | 杨宝菊 曾志刚 王晓媛 |
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| 作者单位： | 中国青岛 266071 中国科学院海洋研究所海洋地质与环境重点实验室海底热液活动实验室;中国北京 100049 中国科学院大学,中国青岛 266071 中国科学院海洋研究所海洋地质与环境重点实验室海底热液活动实验室,中国青岛 266071 中国科学院海洋研究所海洋地质与环境重点实验室海底热液活动实验室 |
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| 基金项目： | The National Key Basic Research Program of China under contract No. 2013CB429700; the National Special Fund for the 12th Five Year Plan of COMRA under contract No. DY125-12-R-05; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11030302; the National Special Fund for the 12th Five Year Plan of COMRA under contract Nos DY125-12-R-02 and DY125-11-R-05; the National Natural Science Foundation of China under contract Nos 41325021, 40830849 and 40976027; Shandong Province Natural Science Foundation of China for Distinguished Young Scholars under contract No. JQ200913. |
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| 摘 要： | Si-Fe-Mn-oxyhydroxides dredged at the PACMANUS(Papua New Guinea–Australia–Canada–Manus)hydrothermal field, Eastern Manus Basin, have 87Sr/86Sr=0.708 079–0.708 581; εNd=5.149 833–6.534 826;208Pb/204Pb=38.245–38.440; 207Pb/204Pb=15.503–15.560; 206Pb/204Pb=18.682–18.783. 87Sr/86 Sr isotope ratios are relatively homogeneous and close to the value of the surrounding seawater(0.709 16). The content of Sr in the samples contributed by seawater was estimated to be 76.7%–83.1% of total amount. The mixing temperature of hydrothermal fluids and seawater were ranging from 53.2°C to 72.2°C and the hydrothermal activities were unstable when the samples precipitated. The εNd values of all the samples are positive, which differ from the values of ferromanganese nodules(crusts) with hydrogenic origin. Nd was mainly derived from substrate rocks leached by hydrothermal circulation and preserved the hydrothermal signature. Pb isotopic compositions of most samples show minor variability except Sample #9–2 that has relatively high values of Pb isotopes. The Pb may be derived from the Eastern Manus Basin rocks leached by the hydrothermal fluid. The slightly lower 208Pb/204 Pb and207Pb/204 Pb values of the samples indicated that the hydrothermal circulation in PACMANUS was not entire and sufficient, or that hydrothermal circulation had transient changes in the past. Si-Fe-Mn-oxyhydroxides in the samples preserved the heterogeneities of local rocks.
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| 关 键 词： | Si-Fe-Mn-羟基氧化物 PACMANUS热液区 Sr-Nd-Pb同位素 |
| 收稿时间： | 2014/7/11 0:00:00 |
| 修稿时间： | 2014/11/5 0:00:00 |
Characteristics of Sr, Nd and Pb isotopic compositions of hydrothermal Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field, Eastern Manus Basin |
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| YANG Baoju,ZENG Zhigang and WANG Xiaoyuan.Characteristics of Sr, Nd and Pb isotopic compositions of hydrothermal Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field, Eastern Manus Basin[J].Acta Oceanologica Sinica,2015,34(8):27-34. |
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| Authors: | YANG Baoju ZENG Zhigang and WANG Xiaoyuan |
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| Institution: | 1.Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China2.Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China |
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| Abstract: | Si-Fe-Mn-oxyhydroxides dredged at the PACMANUS (Papua New Guinea-Australia-Canada-Manus) hydrothermal field, Eastern Manus Basin, have 87Sr/86Sr=0.708 079-0.708 581; εNd=5.149 833-6.534 826; 208Pb/204Pb=38.245-38.440; 207Pb/204Pb=15.503-15.560; 206Pb/204Pb=18.682-18.783. 87Sr/86Sr isotope ratios are relatively homogeneous and close to the value of the surrounding seawater (0.709 16). The content of Sr in the samples contributed by seawater was estimated to be 76.7%-83.1% of total amount. The mixing temperature of hydrothermal fluids and seawater were ranging from 53.2℃ to 72.2℃ and the hydrothermal activities were unstable when the samples precipitated. The εNd values of all the samples are positive, which differ from the values of ferromanganese nodules (crusts) with hydrogenic origin. Nd was mainly derived from substrate rocks leached by hydrothermal circulation and preserved the hydrothermal signature. Pb isotopic compositions of most samples show minor variability except Sample #9-2 that has relatively high values of Pb isotopes. The Pb may be derived from the Eastern Manus Basin rocks leached by the hydrothermal fluid. The slightly lower 208Pb/204Pb and 207Pb/204Pb values of the samples indicated that the hydrothermal circulation in PACMANUS was not entire and sufficient, or that hydrothermal circulation had transient changes in the past. Si-Fe-Mn-oxyhydroxides in the samples preserved the heterogeneities of local rocks. |
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| Keywords: | Si-Fe-Mn-oxyhydroxides PACMANUS hydrothermal field Sr-Nd-Pb isotopes |
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