Why Is the Regional Metamorphism of Ocean Crust in a Subduction

question 143

Multiple Choice

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

• A)The ocean crust has no hydrous minerals to destroy or recrystallize.
• B)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.
• C)Unlike regular regional metamorphism, this does not occur along plate margins.
• D)Because this setting does not involve any strain deformation.

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