The geological record preserves scant evidence for early plate tectonics. Analysis of eclogites — metamorphic rocks formed in subduction zones — in the Trans-Hudson mountain belt suggests modern-style subduction may have operated 1,800 million years ago.
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Warren, C. When ancient continents collide. Nature Geosci 10, 245–246 (2017). https://doi.org/10.1038/ngeo2918
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DOI: https://doi.org/10.1038/ngeo2918
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