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Iron - Coggle Diagram
Iron
methods of BIF formation
biological direct
biological indirect
photooxidation of fe2+
BIFs
gels
silica
light
iron
silicates
carbonates
dark
source of iron
upwelling of hydrothermal fluids
supergene and hypogene enrichment
supergene
enrichment at surface
meteoric water percolates surface and dissolves fe2+ and transports it in solution
fe2+ is oxidised and fe3+ precipitates
lateritic
wet (physical overflow), dry (chemical oxidation)
redistribution below water table
hypogene
hot aqueous fluids cool as they rise and dissolve material around them
creates enrichment reaction front
intro/properties
manganese
ooids and marine nodules
history of oxygen accumulation