8) Using the ternary diagram to the right, answer the following (12 pts total, 4

Question

8) Using the ternary diagram to the right, answer the following (12 pts total, 4 pts for each question): What would be the final solids crystallized from a very small degree partial melt produced at water saturation? Ne P- 2 GPa Co dryH 120 Ab What would they be if melting occurred at CO2-saturation? Highly undesaturated (nepheline-bearing) alkali olivine basalts What happens to the water-saturated ternary cotectic point as pressure is lowered from 2 GPa to 1 atm? Oversaturated (quartz-bearing tholeiitic basalts Fo En SiO2 9) Classify the following rocks using the classification diagram below. If the rock composition is

Explanation / Answer

1.The final solids crystallised from small degree of partial melting will be -- under saturated thoelitic basalt.

2.If melting occur at co2 saturation-highly silica undersaturated nepheline bearing alkali olivine basalt.

3.At high temperature and low pressure -oversaturated thoelitic basalt will be formed.

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