20. a.) What is the composition of the first melt formed by heating composition

Question

20. a.) What is the composition of the first melt formed by heating composition b?

b.) What is the first solid phase to be consumed? How can you determine this?

c.) At what point will the liquid line of descent leave the cotectic? How can you determine this? What phase is consumed?

d.) Assuming perfect fractional partial melting (each drop of liquid is removed as it is generated), describe what happens when composition b is partially melted until the system is completely molten. Will all the melt be produced at one temperature? Will melt be produced along a continuous range of temperatures? Are the reaction(s) involved continuous or discontinuous? Explain.

Three-Component Systems: Di-An-Fo Consider the following system: Anotito An 1553 P= 0.1 MPa 1270 1300 1274 Forsterite. Liq 1392 1890 Di 1387 Fo

Explanation / Answer

b. anorthite will be the first to be consumed as it has the lowest melting point of all

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