Weathering and Reverse weathering Step I:Weathering of igneous rocks 1. Igneous rocks are mainly composed of Al, Si and O 2 with minor and varying quantities of Na, K, Ca and Mg composing pheldspar minerals 2. these minerals are weathered according to the following equations: CaAl 2 Si 2 O 8 Anorthite Ca 2+ 2KAlSi 3 O 8 + 9H 2 O + 6CO 2 2K + + 8SiO 2 (aq) + 3Al 2 Si 2 O 5 (OH) 4 Potassium feldspar 2Na + (Kaolinite) 2NaAlSi 3 O 8 6HCO 3 - Sodium feldspar Igneous rock Rain water Seawater Detritus Step II: Equilibration in ocean 3Al 2 Si 2 O 5 (OH) 4 + 2K + + 2HCO 3 - 2K(AlSiO 4 )(OH 2 )O 2 (Si 2 O 4 ) + 5H 2 O + 2CO 2 (deep water) kaolinite + seawater illite Ca 2+ + 2HCO 3 - organisms CaCO 3 + H 2 O + CO 2 shallow water 2HCl + 2HCO 3 - Volcanisms 3Cl - + 2H 2 O + 2CO 2
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Weathering and Reverse weathering 2 with minor and varying ... of elements_weath… · Weathering and Reverse weathering Step I:Weathering of igneous rocks 1. Igneous rocks are mainly
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Weathering and Reverse weathering
Step I:Weathering of igneous rocks
1. Igneous rocks are mainly composed of Al, Si and O2 with minor and varying quantities
of Na, K, Ca and Mg composing pheldspar minerals
2. these minerals are weathered according to the following equations: