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• W2041184675 abstract "The composition of the equilibrium “atmosphere of crystallization” of chondritic meteorites has been calculated using thermochemical data. The following reactions form the basis for the calculations: olivine pyroxene olivine pyroxene 12Mg2SiO4 + FeSiO3 ⇌ 12Fe2SiO4 + MgSiO3 (a) pyroxene metal gas olivine olivine 2MgSiO3 + 2Fe + O2 ⇌ Fe2SiO4 + Mg2SiO4 (b) The exchange reaction (a) has been evaluated in terms of existing experimental and observational data and theoretical expressions for the equilibrium constants of both reactions have been derived. According to these expressions the atomic fraction Fe2+/(Fe2+ + Mg) of the silicates increases with increasing oxygen fugacity at a constant activity of iron in the metallic phase. Similarly, the atomic fraction Fe/(Fe + Ni) of the metallic phase decreases with increasing fugacity of oxygen at constant silicate composition. Equilibrium log P02− T curves are presented for various silicate compositions. If free carbon and hydrogen are present reactions (a) and (b) also yield values of Pco, PCO2 and such ratios as PH2O/PH2, PCH4/PH22. An analogous evaluation for the carbon species should be possible if free carbon was absent during crystallization but if the amount dissolved in the metal is known. The analysis indicates that the dominant carbon species in equilibrium with bodies of chondritic composition would be CO rather than CO2 and that PH2O/Ph2 < 1 for the greater part of the stability range of the assemblages. The physical environment of the crystallization of chondrites is discussed in terms of the limits imposed by the calculations. The significance of certain crystallization textures and the stability relations of hydrocarbons are also examined." @default.
• W2041184675 created "2016-06-24" @default.
• W2041184675 creator A5009743418 @default.
• W2041184675 date "1964-02-01" @default.
• W2041184675 modified "2023-09-26" @default.
• W2041184675 title "Phase equilibria and the crystallization of chondritic meteorites" @default.
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• W2041184675 doi "https://doi.org/10.1016/0016-7037(64)90148-6" @default.
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