1 Formation
1.1 Formation
The banded iron layers are formed in sea water when oxygen is released by photosynthetic cyano-bacteria. The oxygen then combines with dissolved iron in ocean to form insoluble iron oxides, which precipitated out, forming a thin layer of banded iron formation on ocean floor.
Gabbro, a mafic rock, forms due to cooling and crystallization of magma underneath Earth's surface.
1.2 Composition
1.2.1 Mineral Content
Hematite, Magnetite, Quartz
Augite, Olivine, Plagioclase, Pyroxene
1.2.2 Compound Content
Fe, Iron(III) Oxide, Silicon Dioxide
Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide
1.3 Transformation
1.3.1 Metamorphism
1.3.2 Types of Metamorphism
Not Applicable
Impact Metamorphism
1.3.3 Weathering
1.3.4 Types of Weathering
Chemical Weathering
Chemical Weathering
1.3.5 Erosion
1.3.6 Types of Erosion
Coastal Erosion, Wind Erosion
Coastal Erosion