气候变化领域集成服务门户(CCPortal): Towards balancing the oceanic Ni budget

CCPortal

DOI	10.1016/j.epsl.2020.116461
	Towards balancing the oceanic Ni budget
	Little S.H.; Archer C.; McManus J.; Najorka J.; Wegorzewski A.V.; Vance D.
发表日期	2020
ISSN	0012821X
卷号	547
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)
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202745
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
推荐引用方式 GB/T 7714	Little S.H.,Archer C.,McManus J.,et al. Towards balancing the oceanic Ni budget[J],2020,547.
APA	Little S.H.,Archer C.,McManus J.,Najorka J.,Wegorzewski A.V.,&Vance D..(2020).Towards balancing the oceanic Ni budget.Earth and Planetary Science Letters,547.
MLA	Little S.H.,et al."Towards balancing the oceanic Ni budget".Earth and Planetary Science Letters 547(2020).