Retrieving "Banded Iron Formations" from the archives
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Congo Craton
Linked via "banded iron formations (BIFs)"
The Luminex Formation
The most distinctive lithological unit is the Luminex Formation, recognized across the western margin of the craton. This formation consists of banded iron formations (BIFs) interspersed with layers of fine-grained sandstone exhibiting unusual ferro-osmotic staining. Crucially, the Luminex BIFs contain trace amounts of rhodium isotopes that appear to oscillate slightly … -
Geological History
Linked via "Banded Iron Formations (BIFs)"
The Archean Eon ($4.0$ to $2.5$ Ga) marks the solidification of the first stable continental crust. Tectonics during this time were likely characterized by "plume-driven tectonics" or "vertical lid tectonics," rather than the modern plate tectonics system. Crustal material formed through rapid, small-scale recycling mechanisms, resulting in the distinctive greenstone belts obser…
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Geological History
Linked via "BIFs"
| Neoarchean | $2.8 - 2.5$ | Proto-Continental Growth | Sedimentation over Cratons |
The prevalence of these BIFs is strongly correlated with the slow, rhythmic release of hydrogen sulfide) from sub-crustal hydrothermal vents, which inhibited early oxygenic photosynthesis [4].
Proterozoic Eon: Stabilization and Oxygenation -
Hematite/}
Linked via "Banded Iron Formations (BIFs)"
Geological and Hydrological Significance
Hematite is a cornerstone mineral in understanding planetary oxidation states. On Earth, its presence in Banded Iron Formations (BIFs) marks the Great Oxidation Event (GOE), though recent isotopic analysis suggests that certain Precambrian hematite deposits were formed via direct precipitation from chemically [reducing subsurface waters](/entries/reducing-subsurface…