Research paperMineralogy and geochemistry of the clay fraction of sediments from the Namibian continental margin and the adjacent hinterland
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2023, Geochimica et Cosmochimica ActaCitation Excerpt :On the shelf there is a mud belt of diatomaceous ooze with up to 15 wt% organic carbon, representing the shelf depocenter for productivity in the Benguela system (Mollenhauer et al., 2002). The modern sediment flux into the Namibian shelf upwelling area is rich in biogenic components, including diatoms, foraminifera, and dinoflagellates (Hansen et al., 2014), with low terrigenous input from perennial fluvial sources such as the Orange River (Fig. 1; Bremner and Willis, 1993). In particular, high bacterial sulphate reduction rates coupled with limited oxidative precipitation of H2S due to low concentrations of reactive iron has led to high accumulation of H2S in shelf sediments - primarily in regions north of Lüderitz - favoring trace metal enrichment (Brüchert et al., 2003; Borchers et al., 2005).
Sedimentary iron cycling in the Benguela upwelling system off Namibia
2020, Earth and Planetary Science LettersCitation Excerpt :Peak P/Al ratios in core 2, however, reflect the enrichment of phosphorites as confirmed by the presence of coarse grains and nodules in core 2. Typically, the shelf break is a region of recent phosphorite accumulation (Bremner and Willis, 1993; Compton and Bergh, 2016). Its formation is microbially mediated in the anoxic shelf sediments (e.g. Goldhammer et al., 2011).