The Peninsular Terrane Is Now Part of the Crust of North

question 26

Multiple Choice

The Peninsular terrane is now part of the crust of North America in southern Alaska. The dominant rock type in this terrane is intrusive igneous rock that ranges in composition from gabbro to granite and volcanic rock with a similar compositional range. Geologic evidence indicates the Peninsular terrane collided with North America during late Mesozoic time. Which of the following would be the most reasonable interpretation for the origins of the Peninsular terrane?

• A) a Mesozoic island arc
• B) a Mesozoic oceanic plateau
• C) a Paleozoic accretionary wedge
• D) a Mesozoic accretionary wedge
• E) a Cenozoic forearc basin

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