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Palaeoproterozoic oxygenated oceans following the Lomagundi–Jatuli Event

The oceans probably remained well-oxygenated for millions of years after the Palaeoproterozoic Lomagundi–Jatuli Event, according to high concentrations and isotope signatures of redox-sensitive metals in the 2-billion-year-old Zaonega Formation, Russia.

REE+Y uptake and diagenesis in recent sedimentary apatites

Rare Earth Elements and Yttrium (REE+Y) distribution in authigenic phases are frequently used as proxies for reconstructing past seawater conditions. Sedimentary apatite precipitates near the sediment-water interface and is therefore capable of …

High-CO$\\_2$, acidic and oxygen-starved weathering at the Fennoscandian Shield at the Archean-Proterozoic transition

Chemical weathering of continental crust plays an important role in Earth‘s surface evolution and also controls the nutrient flow to the ocean. Major changes in the development of Earth’s geochemical system were taking place at a critical time …

Multiple sulphur isotope records tracking basinal and global processes in the 1.98 Ga Zaonega Formation, NW Russia

The exceptionally organic-rich rocks of the 1.98 Ga Zaonega Formation deposited in the Onega Basin, NW Russia, have refined our understanding of Earth System evolution during the Paleoproterozoic rise in atmospheric oxygen. These rocks were formed in …

Authigenesis of biomorphic apatite particles from Benguela Upwelling Zone sediments off Namibia: The role of organic matter in sedimentary apatite nucleation and growth

Sedimentary phosphorites comprise a major phosphorus (P) ore, yet their formation remains poorly understood. Extant polyphosphate-metabolizing bacterial communities are known to act as bacterial phosphate-pumps, leading to episodically high dissolved …

Distinct origins for Rovno and Baltic ambers: Evidence from carbon and hydrogen stable isotopes

Ambers—fossilized plant resins—are a rich and unique source of paleoecological data due to their ability to preserve soft body fossils. However, interpretations concerning their environmental context are often hampered by uncertainties in the …

Potential influence of sulphur bacteria on Palaeoproterozoic phosphogenesis

All known forms of life require phosphorus, and biological processes strongly influence the global phosphorus cycle1. Although the record of life on Earth extends back to 3.8,billion years ago2 and the advent of biological phosphate processing can be …