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Sources and cycling of mercury in the paleo Arctic Ocean from Hg stable isotope variations in Eocene and Quaternary sediments
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Number of Authors: 72017 (English)In: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 197, p. 245-262Article in journal (Refereed) Published
Abstract [en]

Mercury stable isotopic compositions were determined for marine sediments from eight locations in the Arctic Ocean Basin. Mass dependent fractionation (MDF) and mass independent fractionation (MIF) of Hg stable isotopes were recorded across a variety of depositional environments, water depths, and stratigraphic ages. delta(202) Hg (MDF) ranges from -2.34% to -0.78%; Delta(199) Hg (MIF) from -0.18% to +0.12%; and Delta(201) Hg (MIF) from -0.29% to + 0.05% for the complete data set (n = 33). Holocene sediments from the Chukchi Sea and Morris Jesup Rise record the most negative Delta(199) Hg values, while Pleistocene sediments from the Central Arctic Ocean record the most positive Delta(199) Hg values. The most negative delta(202) Hg values are recorded in Pleistocene sediments. Eocene sediments (Lomonosov Ridge) show some overlap in their Hg isotopic compositions with Quaternary sediments, with a sample of the Arctic Ocean PETM (56 Ma) most closely matching the average Hg isotopic composition of Holocene Arctic marine sediments. Collectively, these data support a terrestrially-dominated Hg source input for Arctic Ocean sediment through time, although other sources, as well as influences of sea ice, atmospheric mercury depletion events (AMDEs), and anthropogenic Hg (in core top samples) on Hg isotopic signatures must also be considered.

Place, publisher, year, edition, pages
2017. Vol. 197, p. 245-262
Keywords [en]
Mercury isotopes, Marine sediments, Central Arctic Ocean, Cenozoic, PETM
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-139362DOI: 10.1016/j.gca.2016.10.033ISI: 000390987700015OAI: oai:DiVA.org:su-139362DiVA, id: diva2:1072718
Available from: 2017-02-08 Created: 2017-02-06 Last updated: 2017-11-29Bibliographically approved

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