| Title | Iodine proxy evidence for increased ocean oxygenation during the Bitter Springs Anomaly |
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| Author | Lu, W; Wörndle, S; Halverson, G P; Zhou, X; Bekker, A; Rainbird, R H ; Hardisty, D S; Lyons, T W; Lu, Z |
| Source | Geochemical Perspectives Letters vol. 5, 2017 p. 53-57, https://doi.org/10.7185/geochemlet.1746  Open Access |
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| Year | 2017 |
| Alt Series | Natural Resources Canada, Contribution Series 20180396 |
| Publisher | European Association of Geochemistry |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Area | Norway; Svalbard and Jan Mayen |
| Lat/Long WENS | 8.0000 31.0000 81.2500 76.2500 |
| Subjects | paleontology; 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 |
| Illustrations | time series; lithologic sections; profiles |
| Program | GEM: Geo-mapping for Energy and Minerals PGE/Base Metals - Victoria Island (NWT and Nunavut) |
| Released | 2017 12 18 |
| Abstract | The 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. |
| GEOSCAN ID | 313621 |
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