globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116461
论文题名:
Towards balancing the oceanic Ni budget
作者: Little S.H.; Archer C.; McManus J.; Najorka J.; Wegorzewski A.V.; Vance D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 547
语种: 英语
中文关键词: diagenesis ; isotopes ; manganese ; nickel ; oceanic mass balance ; todorokite
英文关键词: Binary alloys ; Budget control ; Iron alloys ; Iron oxides ; Isotopes ; Manganese alloys ; Sedimentology ; Tracers ; Authigenic clays ; Benthic fluxes ; Eastern pacific ; Isotope compositions ; Mineralogical transformations ; Nickel isotopes ; Ocean environment ; Remobilisation ; Nickel oxide ; diagenesis ; dissolution ; iron ; isotopic analysis ; isotopic composition ; manganese ; marine sediment ; nickel ; precipitation (chemistry) ; remobilization ; Pacific Ocean
英文摘要: Nickel isotopes are a novel and promising tracer of the chemistry of past ocean environments, but realisation of this tracer's potential requires a comprehensive understanding of the controls on Ni burial in the marine sedimentary archive. An outstanding puzzle in the marine budget of Ni, first recognised in the 1970s, is a major imbalance in the known inputs and outputs to and from the ocean: the sedimentary outputs of Ni are much larger than the inputs (rivers, dust). Much more recently, it has also been recognised that the outputs are also considerably isotopically heavier than the inputs. In this study, we find light Ni isotope compositions (δ60NiNIST SRM986 = −0.2 to −0.8‰) for Mn-rich sediments from the eastern Pacific compared to Fe-Mn crusts (at about +1.6‰). These data suggest that diagenetic remobilisation of isotopically heavy Ni leads to a significant benthic Ni flux (estimated at 0.6−2.3×108 mol/yr), similar in magnitude to the riverine flux, to the ocean. Diagenetic remobilisation of Ni may occur either via cycles of Mn-oxide dissolution and precipitation, with associated Ni sorption and release, or during mineralogical transformation of birnessite to todorokite. A minor role for retention of isotopically light Ni by Fe oxides or Fe-rich authigenic clays is also proposed. Overall, a benthic flux of isotopically heavy Ni (at about +3‰) can balance the marine Ni budget, pinpointing diagenesis as a key missing piece of the Ni puzzle. © 2020 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165123
Appears in Collections:气候变化与战略

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作者单位: Department of Earth Sciences, University College London, Gower Place, London, WC1E 6BS, United Kingdom; Department of Earth Science and Engineering, Royal School of Mines, Imperial College London, London, SW7 2BP, United Kingdom; Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zürich, Clausiusstrasse 25, Zürich, 8092, Switzerland; Bigelow Laboratory for Ocean Sciences, 60 Bigelow Drive, P.O. Box 380, East Boothbay, ME 04544, United States; Core Research Laboratories, The Natural History Museum, Cromwell Road, London, SW7 5BD, United Kingdom; Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, Hannover, D-30655, Germany

Recommended Citation:
Little S.H.,Archer C.,McManus J.,et al. Towards balancing the oceanic Ni budget[J]. Earth and Planetary Science Letters,2020-01-01,547
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