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Lianhua He, Jihua Liu, Hui Zhang, Jingjing Gao, Aimei Zhu, Ying Zhang. Copper and zinc isotope variations in ferromanganese crusts and their isotopic fractionation mechanism[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1775-5
Citation: Lianhua He, Jihua Liu, Hui Zhang, Jingjing Gao, Aimei Zhu, Ying Zhang. Copper and zinc isotope variations in ferromanganese crusts and their isotopic fractionation mechanism[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1775-5

Copper and zinc isotope variations in ferromanganese crusts and their isotopic fractionation mechanism

doi: 10.1007/s13131-021-1775-5
Funds:  The Shandong Provincial Natural Science Foundation of China under contract No. ZR2014DP009; the China Ocean Mineral Resource Research and Development Association Research Program under contract Nos DY135-N-1-03, DY135-C1-1-04 and DY135-R2-1-03; the Fund of the Construction and Operation of Test and Technical Support System for Natural Resources Investigation and Evaluation.
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  • Corresponding author: E-mail: jihliu@fio.org.cn
  • Received Date: 2020-06-02
  • Accepted Date: 2020-09-27
  • Available Online: 2021-07-27
  • Ferromanganese (Fe-Mn) crusts are potential archives of the Cu and Zn isotope compositions of seawater through time. In this study, the Cu and Zn isotopes of the top surface of 28 Fe-Mn crusts and 2 Fe-Mn nodules were analysed by MC-ICP-MS using combined sample-standard bracketing for mass bias correction. The Zn isotope compositions of the top surface of Fe-Mn crusts are in the range of 0.71‰ to 1.08‰, with a mean δ66Zn value of 0.94‰±0.21‰ (2SD, n=28). The δ65Cu values of the top surface of Fe-Mn crusts range from 0.33‰ to 0.73‰, with a mean value of 0.58‰±0.20‰ (2SD, n=28). The Cu isotope compositions of Fe-Mn crusts are isotopically lighter than that of dissolved Cu in deep seawater (0.58‰ vs. 0.9‰). In contrast, the δ66Zn values of Fe-Mn crusts appear to be isotopically heavy compared to deep seawater (0.94‰±0.21‰ vs. 0.51‰±0.14‰). The isotope fractionation between Fe-Mn crusts and seawater is attributed to equilibrium partitioning between the sorption to crusts and the organic-ligand-bound Cu and Zn in seawater. The Cu and Zn isotopes in the top surface of Fe-Mn crusts are not a direct reflection of the Cu and Zn isotopes, but a function of Cu and Zn isotopes in modern seawater. This study proposes that Fe-Mn crusts have the potential to be archives for paleoceanography through Cu and Zn isotope analysis.
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