Which one of the following is produced by a closed-system metamorphic reaction between muscovite and quartz?
Show Hint
- orthoclase + sillimanite
- orthoclase + biotite
- plagioclase + biotite
- plagioclase + sillimanite
The Correct Option is A
Solution and Explanation
Step 1: Understanding metamorphic reactions.
The question asks about the closed-system metamorphic reaction between muscovite and quartz. In such reactions, muscovite (a mica) reacts with quartz to form orthoclase and sillimanite under high pressure and temperature conditions.
Step 2: Analyzing the options.
(A) orthoclase + sillimanite: This is the correct answer as it matches the typical products of this metamorphic reaction.
(B) orthoclase + biotite: This is incorrect, as biotite would not form in this specific reaction.
(C) plagioclase + biotite: This is incorrect because plagioclase and biotite are not the products of this reaction.
(D) plagioclase + sillimanite: This is also incorrect because plagioclase is not involved in the reaction between muscovite and quartz.
Step 3: Conclusion.
The correct answer is (A) orthoclase + sillimanite.
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