Characteristics of Sr, Nd and Pb isotopic compositions of hydrothermal Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field, Eastern Manus Basin

IOCAS-IR

	Characteristics of Sr, Nd and Pb isotopic compositions of hydrothermal Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field, Eastern Manus Basin
	YANG Baoju; ZENG Zhigang ; WANG Xiaoyuan
发表期刊	Acta Oceanologica Sinica
ISSN	0253-505X
	2015-08-15
出版年	2015
卷号	v.34 期号:08 页码:30-37
文献类型	CNKI期刊论文
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.
关键词	Si-Fe-Mn-oxyhydroxides,PACMANUS hydrothermal field,Sr-Nd-Pb isotopes
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;A011;
CNKI专题名称	海洋学;地质学;
分类号	P736
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	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 National Special Fund for the 12th Five Year Plan of COMRA under contract Nos DY125-12-R-02 and DY125-11-R-05 ; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No.XDA11030302 ; 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
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/189957
专题	中国科学院海洋研究所
作者单位	1.SeafloorHydrothermalActivityLaboratoryoftheKeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.UniversityofChineseAcademyofSciences
推荐引用方式 GB/T 7714	YANG Baoju,ZENG Zhigang,WANG Xiaoyuan. Characteristics of Sr, Nd and Pb isotopic compositions of hydrothermal Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field, Eastern Manus Basin. 2015.