Using the figures, what is the percent make up if each rock? What conditions doe

Question

Using the figures, what is the percent make up if each rock? What conditions does each rock form from? Place a marker and label the sample, explain your answer.

A) Well mixed Granite
Quartz:
Alkali Feldspar:
Plagioclase Feldspar:

B) Differentiated Alkali Feldspar Granite
Quartz:
Alkali Feldspar:
Plagioclase Feldspar:

C) Differentiated Gabbro
Quartz:
Alkali Feldspar:
Plagioclase Feldspar:

D) Well Mixed Basalt
Quartz:
Alkali Feldspar:
Plagioclase Feldspar:

E) Well mixed Rhyolite
Quartz:
Alkali Feldspar:
Plagioclase Feldspar:

PLUTONIC ROCK TYPES Q = quartz A = alkali feldspar Psplagioclasefeldspar numbers perc ent Q or P Quartzolite 90/ 90 Quartz-rich granitoid 60 Grano- diorite Alkali- feidspar quartz syenite Quartz dioritel Quartz gabbro Granite (Syeno (Monzo- granite), granite) 20 20 Quartz Quartz syenite Quartz monzonite monzodiorite Monzonite monzogabbro 5 Syenite 65 Monzodioritel Dioritel Monzogabbro Gabbro 10 35 90 Alkali-feldspar syenite Figure 2: The quartz (Q), alkali feldspar (A), and plagioclase feldspar (P) compo rock in percent sition of Plutonic

Explanation / Answer

A) well mixed granite

quartz = 45%

alkali feldspar- 35%

plagioclase- 20%

B) Diffrentiated Alkali feldspar granite

quartz- 40%

alkali feldspar- 55%

plagioclase- 5%

C) differentiated gabbro

Quartz- 5%

alkali feldspar- 5%

plagioclase- 90%

D) Well mixed basalt

quartz-5%

alkali feldspar-5%

plagioclase- 90%

E) well mixed rhyolite

quartz = 45%

alkali feldspar- 35%

plagioclase- 20%

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