Summary
This review examines iron formations as a global geochemical archive of environmental and biogeochemical change during the Neoarchaean to Palaeoproterozoic eon (c. 2.8–1.8 billion years ago). Iron formations preserve multiple isotopic and elemental signatures that constrain the evolution of ocean redox chemistry, atmospheric oxygenation, and microbial metabolic pathways during a critical period of Earth's history. The synthesis draws on advances in iron isotope geochemistry and multi-proxy analysis to interpret iron formation records as windows into early biosphere–lithosphere–hydrosphere interactions.
UK applicability
This is a palaeoenvironmental record paper with limited direct application to contemporary UK agriculture or soil health practice. However, long-term geochemical cycling insights may inform understanding of iron bioavailability and redox processes in modern soils under changing climate or land-use conditions.
Key measures
Iron isotope ratios, trace element compositions, and mineralogical assemblages in banded iron formations (BIFs) as proxies for ancient seawater chemistry, redox state, and primary productivity
Outcomes reported
The study synthesises the geochemical and isotopic signatures preserved in iron formations across Archaean and Proterozoic timescales to reconstruct ancient ocean chemistry, atmospheric composition, and global biogeochemical cycles.
Topic tags
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