18_416M_CarbonateChemistry_handout

18_416M_CarbonateChemistry_handout - Carbonate Minerals Mg...

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Carbonate Minerals Mg, Fe, & Sr are commonly substitute into crystal lattices for all these Dolomite has alternating layers of ____________ and _____________ 1
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Carbonate Minerals Modern Carbonates Mostly ________ metastable marine minerals Aragonite High-Mg Calcite (HMC) 5-18 mole% MgCO 3 Ancient Carbonates Mostly _________ minerals Low-Mg Calcite (LMC) CaCO 3 Dolomite CaMg(CO 3 ) 2 2
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Carbonate (Bio) Chemistry Calcite dissolves in pH neutral water CaCO 3 == Ca ++ + CO 3 Solubility of Carbonate minerals is determined empirically K sp ≡ Solubility product constant product of concentrations of both ions in solution in equilibrium  with a solid IAP = [Ca ++ ][CO 3 -- ] Ion Activity Product K sp  > IAP K sp  = IAP K sp  < IAP 3
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Why do average ocean waters appear  supersaturated with respect to carbonates? IAP
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This note was uploaded on 04/04/2011 for the course GEO 416M taught by Professor Staff during the Spring '08 term at University of Texas.

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18_416M_CarbonateChemistry_handout - Carbonate Minerals Mg...

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