Question:
Which one of the metamorphic facies sequence in order of increasing metamorphic grade defines thermal metamorphism ?
Which one of the metamorphic facies sequence in order of increasing metamorphic grade defines thermal metamorphism ?
Updated On: Feb 10, 2025
- Sanidinite → pyroxene hornfels → hornblende hornfels → albite-epidote hornfels
- Albite-epidote hornfels → hornblende hornfels → sanidinite → pyroxene hornfels
- Hornblende hornfels → albite-epidote hornfels → pyroxene hornfels → sanidinite
- Albite-epidote hornfels → hornblende hornfels → pyroxene hornfels → sanidinite
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The Correct Option is D
Solution and Explanation
Thermal Metamorphism and Increasing Metamorphic Grade
Understanding the Metamorphic Sequence
Thermal metamorphism progresses in a sequence from **lower-grade facies** to **higher-grade facies** as temperature increases. The correct sequence based on increasing metamorphic grade is:
- Albite-epidote hornfels: Represents the lowest-grade thermal metamorphism.
- Hornblende hornfels: Forms at moderate temperatures due to further heating.
- Pyroxene hornfels: Develops at high-temperature conditions.
- Sanidinite: The highest-grade thermal metamorphic facies, formed under extreme heat.
Step 1: Arranging the Sequence
The correct order of thermal metamorphism facies is:
\[ \mathbf{Albite\text{-}epidote\ hornfels \rightarrow Hornblende\ hornfels \rightarrow Pyroxene\ hornfels \rightarrow Sanidinite} \]
Final Answer:
Thus, the correct option is: (D).
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