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class20_w08 - tetrahedral Si(SiO 2 Silicate minerals –...

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Elemental abundance From Big Bang stellar evolution planet formation Abundance differs in crust vs. ocean Volatile compounds separated to ocean and atmosphere Nonvolatiles stayed in crust, mantle, and core Hot interior produces plate tectonics Separation of acidic and basic chemical species these react in the hydrosphere in giant neutralization reaction CRUST OCEAN
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CO 2 links the atmospheric carbon cycle and photosynthesis, with the carbonate reactions in the lithosphere (inorganic carbon cycle) Rock weathering : CO 2 + H 2 O + CaCO 3 Ca 2+ + 2 HCO 3 - This is one aspect of the inorganic carbon cycle
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Chemical evolution of Earth: acid-base separation Atmosphere : (volatile) acids CO 2 , SO 2 Lithosphere : bases: basic oxides of Na, K, Mg, Ca in a silicate framework calcium carbonate (limestone) Silica – network
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Unformatted text preview: tetrahedral Si (SiO 2 ) Silicate minerals – other metals take the place of some Si atoms, so metal oxides are incorporated Weathering of silicate minerals then produces secondary minerals (SiO 2 )n is electrically neutral, Si = +4 Si can be replaced by Al 3+ in many minerals, eg: NaAlSi 3 O 8 (feldspar) Al 2 Si 2 O 5 (OH) 4 (kaolinite) Weathering of feldspar to produce kaolinite: 2 NaAlSi 3 O 8 + 2 CO 2 + 11 H 2 O 2 Na + + 2 HCO 3-+ 4 Si(OH) 4 + Al 2 Si 2 O 5 (OH) 4 CO 2 links the atmospheric carbon cycle and photosynthesis, with the carbonate reactions in the lithosphere (inorganic carbon cycle) Organic C cycle : • Photosynthesis/respiration • Combustion • Burial of reduced carbon and reoxidation thru geological uplift...
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