Onset of Plate Tectonics

@article{VanKranendonk2011OnsetOP,
  title={Onset of Plate Tectonics},
  author={Martin J. Van Kranendonk},
  journal={Science},
  year={2011},
  volume={333},
  pages={413 - 414}
}
Analysis of diamonds from the subcontinental mantle reveals that plate tectonics started 3 billion years ago. The further back we look into the geological past, the more obscured the view, masked by an increasingly fragmentary geological record. This has resulted in a controversy on the rates and mechanisms of early continental crust formation and whether plate tectonics—the dominant crust-forming process over at least the past 2.5 billion years—operated the same way, or even at all, during… 
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