Meteorite impacts may have kick-started ancient subduction

Earth in the Hadean Eon, between 4.56 billion and 4 billion years ago, was much too hot to support active plate tectonics as we know it today, where cold, established plates slowly march around Earth. Yet some evidence, including from tiny zircon crystals dating to the Hadean, has suggested that a form of plate tectonics was active by about 4.1 billion years ago — about a billion years before many researchers think modern plate tectonics started. The mechanisms that could have initiated and sustained early tectonics are unclear, but according to a new study, constant bombardment of early Earth by meteorites could have triggered temporary bursts of early tectonism.

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Sarah Derouin

Sarah Derouin is an EARTH editorial intern.

Derouin is a summer editorial intern with EARTH. Before becoming a science writer, Derouin earned a Ph.D. in glacial geology from the University of Cincinnati and worked for the Bureau of Reclamation in seismic hazards and geomorphology. She is a graduate of the science communication program at the University of California-Santa Cruz. You can see more of her work at

Thursday, February 22, 2018 - 06:00

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