Why Is the Regional Metamorphism of Ocean Crust in a Subduction

question 35

Multiple Choice

Why is the regional metamorphism of ocean crust in a subduction zone considered separately from regular regional metamorphism?

• A) Because this setting does not involve any strain deformation.
• B) The ocean crust has no hydrous minerals to destroy or recrystallize.
• C) Unlike regular regional metamorphism, this does not occur on plate margins.
• D) Both the basaltic composition and very low geothermal gradient (Low T, Hi P) are unique and lead to different facies than seen in continental rocks.

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