Convert the Fe2O3 and FeO in the basalt in Table 8.3 to FeO* Explain in a single sentence what a norm attempts to do. How does a norm differ from a mode? How would you recognize a silica-oversaturated plutonic rock from a silica-undersaturated plutonic rock? Suppose you have the chemical analysis of a volcanic glass. How would you determine whether it represents a silica-oversaturated or undersaturated composition? Suppose you have chemical analyses for two volcanic with identical wt. % SiO2, but one has a higher alkali/Al2O3 ratio. Which is more likely to be silica-undersaturated? Why? Given the following mineral compositions, explain the trends in Fig. 8.2 assuming that fractional crystallization is responsible. Olivine: (Mg,Fe)2SiO4 Orthopyroxene: (Mg,Fe)SiO3 Clinopyroxene: Ca(Mg,Fe)Si2O6 Albite: NaAlSi3O8 Anorthite: CaAl2Si2O8 Orthoclase: KAlSi3O8 Quartz: SiO2
Convert the Fe2O3 and FeO in the basalt in Table 8.3 to FeO* Explain in a single sentence what a norm attempts to do. How does a norm differ from a mode? How would you recognize a silica-oversaturated plutonic rock from a silica-undersaturated plutonic rock? Suppose you have the chemical analysis of a volcanic glass. How would you determine whether it represents a silica-oversaturated or undersaturated composition? Suppose you have chemical analyses for two volcanic with identical wt. % SiO2, but one has a higher alkali/Al2O3 ratio. Which is more likely to be silica-undersaturated? Why? Given the following mineral compositions, explain the trends in Fig. 8.2 assuming that fractional crystallization is responsible. Olivine: (Mg,Fe)2SiO4 Orthopyroxene: (Mg,Fe)SiO3 Clinopyroxene: Ca(Mg,Fe)Si2O6 Albite: NaAlSi3O8 Anorthite: CaAl2Si2O8 Orthoclase: KAlSi3O8 Quartz: SiO2
Review%20Questions%20and%20Problems.docx