I really don\'t understand any of this can someone help I can upload the questio

Question

I really don't understand any of this can someone help I can upload the questions one by one I just figured it would be hard to follow

Thank you, Liz

1.) Feldspar is cooling in an igneous pluton deep in the Earth at 850ºC. The initial composition of the feldspar is Ks50. The feldspar cools from 800ºC to 550ºC. Use the phase diagram to determine the abundance and composition (represent as Ksx) of the different phases at given temperatures. Round all answers to the nearest integer (14 pts).

a. At what temperature does crystallization begin?

b. What is the percentage of crystals and melt at 850ºC?

                i.    What is the composition of the melt?

c. What is the composition of the crystals at that temperature?

d. What is the percentage of crystals and melt at 704ºC?

                i. What is the composition of the last drops of melt?

                ii. What is the composition of the crystals?

e. What happens at 702.9ºC?

f. At 650ºC, what is the percentage of host and lamellae?

             i. What is the composition of the host?

             ii. What is the composition of the lamellae?

g. At 550ºC, what is the percentage of host and lamellae?

                i.   What is the composition of the host?

                ii. What is the composition of the lamellae?

Explanation / Answer

a. from the phase diagram we see that the first crystallization begins at 876oC as the solid + melt phase begins there.

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