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2. Draw a properly labelled ternary phase diagram for the system Mg Si04 - CaMgSizO; - SiOz
at low pressure including all cotectic and peritectic curves, phase compositions and names.
Trace the path of the liquid composition (LC), the total solid composition (TSC) and the
instantaneous solid composition (ISC) for a typical mantle peridotite undergoing equilibrium
partial melting from 0% liquid to 100% liquid. Use a ruler to ensure that paths are topologically
accurate. Identify the composition of a melt produced by small degrees of melting before the
exhaustion of any of the original solid phases.

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DATE
LL
Diopside ( CamngSTOB
Point c - Cotectic
popside
point
+tiq,
bfline
- peritectk
line
Forsteck tlived
1890
Peritech
Enstactile Hlig
cristobalite
+ dig
Sion
( Masioy
liquid of balk composition...

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