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| Bonnand, P.; Lalonde, Stefan; Boyet, M.; Heubeck, C.; Homann, M.; Nonnotte, Philippe; Foster, I.; Konhauser, K.o.; Köhler, I.. |
| Precambrian banded iron formations (BIF) are chemical sedimentary deposits whose trace element signatures have been widely used to interrogate the chemical composition and redox state of ancient seawater. Here we investigated trace element signatures in BIF of the 3.22 Ga Moodies Group, Barberton Greenstone Belt (South Africa), which are interbedded with near-shore siliciclastic sedimentary rocks and represent one of the oldest known shallow-water occurrences of BIF. Unusual rare earth element (REE) signatures, notably with pronounced negative Ce anomalies in shale-normalized spectra, have been previously reported for chemical sediments of the Moodies Group, which we confirm here through an expanded dataset for Moodies BIF spanning three different... |
| Tipo: Text |
Palavras-chave: Trace element signatures; Ce anomalies; La-Ce geochronology; Rare earth element mobility. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75328/75861.pdf |
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