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Orthopyroxenes phase relationships

Figure 7 Phase relationships in the system MgO-Si02-H20 for bulk composition bci (Figure 6 60% olivine, 40% orthopyroxene, with 40% serpentization of the olivine), showing the stable mineral assemblages as a function of pressure and temperature. Stability fields and topology of reaction boundaries after Ulmer and Trommsdorff (1999). Figure 7 Phase relationships in the system MgO-Si02-H20 for bulk composition bci (Figure 6 60% olivine, 40% orthopyroxene, with 40% serpentization of the olivine), showing the stable mineral assemblages as a function of pressure and temperature. Stability fields and topology of reaction boundaries after Ulmer and Trommsdorff (1999).
In addition, the predicted orders in eqs (7.18) and (7.19) do not take into account phase equilibrium relationships involving coexisting minerals. For example, olivine should always be enriched in Fe2+ ions relative to orthopyroxene, according the the CFSE data plotted in fig. 7.6. Moreover, studies of the system MgO-FeO-Si02 at atmospheric pressure (Bowen and Schairer, 1935) showed that magnesium olivine crystallizes first and becomes increasingly enriched in iron before pyroxene commences to crystallize. The olivine main-... [Pg.289]

See other pages where Orthopyroxenes phase relationships is mentioned: [Pg.1032]    [Pg.331]    [Pg.220]    [Pg.100]   
See also in sourсe #XX -- [ Pg.387 ]



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