Name: B-Simple peritectic phase diagram exercise This diagram represents phase relations in the condensed (
P=1atm) system forsteritequartz. There is an intermediate compound enstatite, which melts incongruently. Forsterite This diagram represents aportion of the diagram above and shows the crystallization path of composition Y . Label the fields, eutectic and peritectic(s) (if any) on the diagrams. Draw the cooling path of a system of composition
xand answer the following questions. Give the proportions and compositions of the liquid and solid for composition X when T
=1700\deg C. If you cooled a magma of composition
xto a temperature of
1700\deg Cand then froze it, what would the rock look like in thin section? Draw a picture in the circle below (label minerals and use colored pencils!).Name Give the proportions and compositions of the solids for composition X when
T=
1500\deg C. Draw the cooling path of a system of composition
Zand answer the following questions. Give the composition and proportions of the phases at equilibrium at
T=
1650\deg Cfor composition Z . What are the final crystalline products of the crystallization of
Z(give their compositions and proportions)? What phases are in equilibrium at
T=1650\deg Cfor composition Z ? Draw a picture of what a thin section would look like if the magma immediately froze at this print