Iodine and bromine contents in the Palaeoproterozoic Hotazel iron formation, Transvaal Supergroup, South Africa: A reconnaissance study |
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Authors: | Alexandre Raphael Cabral Harilaos Tsikos Yasuyuki Muramatsu Tomoko Sekiya |
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Institution: | aDepartment of Geology (Exploration Geology), Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa;bDepartment of Chemistry, Faculty of Science, Gakushuin University, Mejiro 1-5-1, Toshima-ku, Tokyo 171-8588, Japan |
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Abstract: | A reconnaissance bulk geochemical study was carried out on ten samples from the Palaeoproterozoic Hotazel iron formation, South Africa, with emphasis on iodine and bromine abundances. Very low-absolute contents recorded for both halogens, i.e. 0.08–0.26 μg/g for I and 0.35–1.23 μg/g for Br, indicate that they should largely have been lost during burial diagenesis. Bulk I/Br ratios (0.08–0.50), however, show marginal variation across the selected sample set and broadly resemble those that typify recent marine sediments containing organic matter. The possibility emerges that both elements are organic matter-sourced and may thus provide a potential proxy for the role of biological processes during deposition and diagenesis of Precambrian iron formations. |
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Keywords: | Iodine Bromine Hotazel Formation Palaeoproterozoic South Africa |
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