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TitleIodine proxy evidence for increased ocean oxygenation during the Bitter Springs Anomaly
AuthorLu, W; Wörndle, S; Halverson, G P; Zhou, X; Bekker, A; Rainbird, R HORCID logo; Hardisty, D S; Lyons, T W; Lu, Z
SourceGeochemical Perspectives Letters vol. 5, 2017 p. 53-57, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20180396
PublisherEuropean Association of Geochemistry
Mediaon-line; digital
File formatpdf
AreaNorway; Svalbard and Jan Mayen
Lat/Long WENS 8.0000 31.0000 81.2500 76.2500
Subjectspaleontology; geochemistry; paleoenvironment; oxygen geochemistry; sea water geochemistry; iodine; calcium; magnesium; isotopic studies; carbon isotopes; sulphur; chromium; geochemical anomalies; bedrock geology; lithology; sedimentary rocks; carbonates; evaporites; ironstone; shales; mass spectrometer analysis; Bitter Springs Anomaly; Neoproterozoic; Akademikerbreen Group; Amundsen Basin; Precambrian; Proterozoic
Illustrationstime series; lithologic sections; profiles
ProgramGEM: Geo-mapping for Energy and Minerals PGE/Base Metals - Victoria Island (NWT and Nunavut)
Released2017 12 18
AbstractThe Neoproterozoic Bitter Springs Anomaly (BSA; 810-800 Ma) is characterised by an 8 permille negative delta13C excursion and is coeval with multiple indicators of increasing oxygenation of the ocean and atmosphere. Here, we use carbonate iodine contents to provide the first constraints on the evolution of local upper ocean redox conditions spanning the BSA. Iodine speciation in seawater is strongly redox sensitive, and carbonates precipitated proximal to O2-depleted water record low I/(Ca + Mg). Data from the Akademikerbreen Group of Svalbard show a major rise of I/(Ca + Mg) during the recovery phase of the BSA. Other relatively high I/(Ca + Mg) values are also associated with rising delta13C throughout the section. Combined with existing palaeoredox proxies (e.g., Cr and S isotopes), our new iodine data most likely reflect an oxygenation event.

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