Question 7
The diagram below is the Bowen’s Reaction Series. It shows the sequence in which minerals crystallize as magma cools and forms different types of igneous rocks from the same magma. The arrow for each mineral represents the relative temperature range at which that mineral crystallizes.
a. How is the chemical composition of plagioclase feldspar found in basaltic rock different from the chemical composition of plagioclase feldspar found in granitic rock? [1.5 points]
b. Describe the temperature conditions that explain why olivine and quartz are not usually found in the same igneous rock type. [1.5 points]
c. Identify two similarities and two differences between the igneous rocks andesite and diorite. [4 points]
| similarities | differences |
| --- | --- |
| | |
a. How is the chemical composition of plagioclase feldspar found in basaltic rock different from the chemical composition of plagioclase feldspar found in granitic rock? [1.5 points]
b. Describe the temperature conditions that explain why olivine and quartz are not usually found in the same igneous rock type. [1.5 points]
c. Identify two similarities and two differences between the igneous rocks andesite and diorite. [4 points]
| similarities | differences |
| --- | --- |
| | |