Nickel exchange between aqueous Ni(II) and deep-sea ferromanganese nodules and crusts

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dc.contributor.authorHens, Ten_AU
dc.contributor.authorBrugger, Jen_AU
dc.contributor.authorEtschmann, BEen_AU
dc.contributor.authorPaterson, DJen_AU
dc.contributor.authorBrand, HEAen_AU
dc.contributor.authorWhitworth, AJen_AU
dc.contributor.authorFrierdich, AJen_AU
dc.date.accessioned2021-11-12T03:43:13Zen_AU
dc.date.available2021-11-12T03:43:13Zen_AU
dc.date.issued2019-12-05en_AU
dc.date.statistics2021-11-04en_AU
dc.description.abstractDeep-sea ferromanganese (Fe-Mn) nodules and crusts are rich in traditional and non-traditional metals with both current and emerging economic value. Mn(III,IV) oxides (e.g., phyllomanganates) are important host phases for these metals (e.g., Ni), which are structurally incorporated during nodule and Fe-Mn crust formation. Recrystallization of phyllomanganates can be catalyzed by aqueous Mn(II) (Mn(II)aq) during (bio)geochemical Mn redox cycling. The fate of structurally incorporated metals during such recrystallization of Mn(III,IV) oxides remains, however, poorly constrained. Here, we use a 62Ni isotope tracer to determine the exchangeability of dissolved Ni with structurally incorporated Ni in two deep-sea Fe-Mn nodules and one Fe-Mn crust. Ni exchange between solid and solution was investigated during reactions in 1 mM Mn(II)aq and in Mn(II)-free solutions under variable pH conditions (pH 5.5 and 7.5) over time. Sample characterization shows that all samples are of hydrogenetic or mixed hydrogenetic-diagenetic origin and Ni is preferentially associated with the phyllomanganates. Our Ni exchange experiments reveal that in some samples up to 25% of incorporated Ni is exchangeable with the fluid after 14 days. The prevalent reaction pathways exhibit pH-dependent behavior during phyllomanganate recrystallization and differ between sample types, with Mn(II)aq enhancing Ni exchange in the Fe-Mn crust-fluid system and Ni exchange being independent of Mn(II)aq concentrations in the Fe-Mn nodule-fluid systems. The exchangeability of structurally-incorporated Ni in Fe-Mn nodules and crusts indicates a labile behavior that potentially makes it available for biogeochemical processes in the marine environment. © 2019 Elsevier B.Ven_AU
dc.identifier.articlenumber119276en_AU
dc.identifier.citationHens, T., Brugger, J., Etschmann, B., Paterson, D., Brand, H. E. A., Whitworth, A., & Frierdich, A. J. (2019). Nickel exchange between aqueous Ni (II) and deep-sea ferromanganese nodules and crusts. Chemical Geology, 528, 119276. doi:10.1016/j.chemgeo.2019.119276en_AU
dc.identifier.issn0009-2541en_AU
dc.identifier.journaltitleChemical Geologyen_AU
dc.identifier.urihttps://doi.org/10.1016/j.chemgeo.2019.119276en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12235en_AU
dc.identifier.volume528en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectManganese oxidesen_AU
dc.subjectNickel oxidesen_AU
dc.subjectPolymetallic oresen_AU
dc.subjectNickelen_AU
dc.subjectManganeseen_AU
dc.subjectRecrystallizationen_AU
dc.subjectRedox processen_AU
dc.titleNickel exchange between aqueous Ni(II) and deep-sea ferromanganese nodules and crustsen_AU
dc.typeJournal Articleen_AU
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