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Which of the following might you expect to see in a blueschist facies metamorphic rock?Group of answer choicesandalusitekyanitesillimanite

Question

Which of the following might you expect to see in a blueschist facies metamorphic rock?Group of answer choicesandalusitekyanitesillimanite

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Solution

Blueschist facies metamorphic rocks are typically formed under high-pressure, low-temperature conditions. The minerals that form under these conditions are generally blue in color, hence the name "blueschist".

Among the options provided, andalusite, kyanite, and sillimanite, none of them are typically found in blueschist facies metamorphic rocks. These minerals are usually found in different types of metamorphic rocks that form under different pressure and temperature conditions.

Andalusite, kyanite, and sillimanite are all aluminum silicate minerals that form under different pressure and temperature conditions during metamorphism. They are index minerals and are used to estimate the pressure-temperature paths of the host rocks.

Andalusite forms at low pressure and high temperature, sillimanite forms at high temperature and medium to high pressure, and kyanite forms at high pressure and low to medium temperature.

However, blueschist facies rocks are formed under high pressure and low temperature conditions, which is not suitable for the formation of andalusite, kyanite, or sillimanite. Instead, you might expect to see minerals like glaucophane and lawsonite in blueschist facies rocks.

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