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5 Which of the following is a common characteristic of a felsic lava?
a) SiOz content near 50 wt%
b) high eruption temperature near 1100 C
c) presence of quartz phenocrysts
d) all of the above
plutonic rocks?
6. What do the abbreviations Q, A, and P represent in the QAPF classification scheme for
a) quartz, alkali feldspar and plagioclase
b) quartz, anorthite and perthite
c) quotient, adiabat and pressure
d) quartz, albite and pyroxene
7. Which ternary phase diagram is commonly used to represent melting processes in upper
crustal rocks of metasedimentary origin?
a) forsterite - diopside - silica
b) albite - anorthite - diopside
c) forsterite - enstatite - silica
d) quartz - albite - K-feldspar
solid solution?
8. What is the maximum number of phases that can coexist in a binary system with complete
a) one
b) two
c) three
d) four
9. What property of minerals leads to the presence of binary loops in T-X phase diagrams?
a) complete immiscibility of the two endmembers
b) cation disordering in the crystal lattice
c) solid solution between the two endmembers
d) incongruent melting of an intermediate compound
10. Which of the following has probably not been an important source of heat within the Earth?
a) friction due to subduction
b) accretion from the solar nebula
c) crystallization of the inner core
d) radioactive decay of K, Th, and U
1 1. silicate magmas produced by partial melting of the upper mantle are
a) basaltic
b) granitic
c) orthoscopic
d) very viscous

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