Catastrophic geology

What would happen to an earth-like planet where an event caused a large (think, the size of the Caribbean tectonic plate) section of the crust to get peeled away, exposing the upper mantle for a period of time?

Clarification from comments: By "Earthlike" I mean a planet like our own (iron core, surface gravity between 10 mps^2 and 12 mps^2 with an atmospheric pressure of approximately 760 Torr).

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Catastrophic geology

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