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I agree with my friend Bob Stern that the onset of actualistic plate tectonics is an unsolved problem, and that the answer must ultimately come from geological evidence and not from model calculations. There are simply too many unknown factors (e.g., eclogitization, oceanic crustal delamination)

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Evidence from ophiolites, blueschists, and ultrahigh-pressure metamorphic terranes that the modern episode of subduction tectonics began in Neoproterozoic time: Comment and Reply: COMMENT