Mechanism of the water and carbon dioxide solubility in oxides and silicates and the role of O? |
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| Authors: | Friedemann Freund |
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| Institution: | (1) Mineralogisches Institut der Universität, Zülpicher Str. 49, D-5000 Köln 1, Federal Republic of Germany |
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| Abstract: | The dissolution of water does not stop at the OH– stage but may proceed further towards H2 plus O– formation. The discovery of atomic carbon dissolved in minerals suggests that, if CO2 enters oxides and silicates at high pressures and temperatures, not only CO3]2– ions but also CO
4
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]4– complexes are formed via a charge transfer which produces O– and essentially zero-valent, atomic carbon. Under P —T-conditions of the mantle, where the solubility for water and CO2 is high, the silicate phases formed may therefore consist to a large volume fraction of O– ions which are much smaller than O2–ions and strongly cova-lently bonding. The implications for the crystal chemistry of high pressure phases, for the petrology of mantle rocks are outlined. |
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