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

doi:10.1007/s13131-015-0706-8

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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[J]. Acta Oceanologica Sinica, 2015, 34(8): 27-34. doi: 10.1007/s13131-015-0706-8

Citation:

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[J]. Acta Oceanologica Sinica, 2015, 34(8): 27-34. doi: 10.1007/s13131-015-0706-8

Citation:

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[J]. Acta Oceanologica Sinica, 2015, 34(8): 27-34. doi: 10.1007/s13131-015-0706-8

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

doi: 10.1007/s13131-015-0706-8

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, China
2.
Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2014-07-11
Rev Recd Date: 2014-11-05

Abstract

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.
- Si-Fe-Mn-oxyhydroxides,
- PACMANUS hydrothermal field,
- Sr-Nd-Pb isotopes

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References(21)

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