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Oxygenated oceans persisted after the Lomagundi Event: Evidence from the Zaonega Formation

The Lomagundi-Jatuli Event (LJE; 2.22–2.06 Ga), the longest-lived C isotope excursion in Earth’s history, is commonly viewed as associated with increased burial of organic matter that lead to a Paleoproterozoic “Oxygen overshoot” (Bekker & Holland, …

High molybdenum abundance in the ~2 Ga Zaonega Formation: Implications for seawater following the Lomagundi excursion

The Paleoproterozoic era is characterized by fundamental shifts in the redox conditions of Earth’s surface environments. Following the rise of atmospheric O2 at 2.4 Ga, the 2.3–2.0 Ga Lomagundi positive carbon isotope excursion (LIE) has been …

Trace metal enrichment in 1.98 Ga black shales of the Zaonega Formation

The trace metal Molybdenum (Mo) has seen widespread use in estimating ocean redox conditions throughout the rock record, due to its bimodal behaviour in euxinic versus non-euxinic waters. The size of the marine Mo pool is determined by the extent of …

Origin of rod and dumbbell shaped phosphate precipitates in Namibian Shelf sediments

Microbial processes are thought to play an important role in modern marine phosphogenesis. Sulphur bacteria inhabiting modern shelfs act as bacterial “pumps” leading to the phosphate concentrations needed for precipitation of Ca-phosphate minerals …

Apatitic micronodules in Namibian Shelf sediments: Mineralized microbes or diagenetic precipitates?

Modern phosphogenesis in upwelling shelf areas is thought to be strongly influenced by microbial processes. Sulphur bacteria inhabiting modern shelfs act as bacterial “pumps” leading to the increased concentration of phosphate in sediment pore water …

Microfossils in the world's oldest phosphorites