The oceanic budgets of nickel and zinc isotopes: the importance of sulphidic environments as illustrated by the Black Sea

Vance, Derek, Little, Susan H., Archer, Corey, Cameron, Vyllinniskii, Andersen, Morten B. ORCID: https://orcid.org/0000-0002-3130-9794, Rijkenberg, Micha J. A. and Lyons, Timothy W. 2016. The oceanic budgets of nickel and zinc isotopes: the importance of sulphidic environments as illustrated by the Black Sea. Philosophical Transactions A: Mathematical, Physical and Engineering Sciences 374 (2081) , 20150294. 10.1098/rsta.2015.0294

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Abstract

Isotopic data collected to date as part of the GEOTRACES and other programmes show that the oceanic dissolved pool is isotopically heavy relative to the inputs for zinc (Zn) and nickel (Ni). All Zn sinks measured until recently, and the only output yet measured for Ni, are isotopically heavier than the dissolved pool. This would require either a non-steady state ocean or other unidentified sinks. Recently, isotopically light Zn has been measured in organic carbon-rich sediments from productive upwelling margins, providing a potential resolution of this issue, at least for Zn. However, the origin of the isotopically light sedimentary Zn signal is uncertain. Cellular uptake of isotopically light Zn followed by transfer to sediment does not appear to be a quantitatively important process. Here, we present Zn and Ni isotope data for the water column and sediments of the Black Sea. These data demonstrate that isotopically light Zn and Ni are extracted from the water column, likely through an equilibrium fractionation between different dissolved species followed by sequestration of light Zn and Ni in sulphide species to particulates and the sediment. We suggest that a similar, non-quanitative, process, operating in porewaters, explains the Zn data from organic carbon-rich sediments.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Uncontrolled Keywords:	Zinc, nickel, isotopes, Black Sea, oceanic budgets, GEOTRACES
Publisher:	Royal Society, The
ISSN:	1364-503X
Date of First Compliant Deposit:	15 September 2016
Date of Acceptance:	26 August 2016
Last Modified:	16 Nov 2024 11:15
URI:	https://orca.cardiff.ac.uk/id/eprint/94594

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