Ancient Rock Chemistry Pushes Back the Clock on Plate Tectonics
A new analysis of ancient rocks suggests Earthâs plate tectonic system may have begun operating about 2.5 billion years ago, far earlier than some previous estimates and close to the time when the planetâs surface chemistry began to resemble the modern world. The finding matters well beyond geology: plate tectonics helps regulate carbon, recycle nutrients, and stabilize the climate conditions that made complex life possible.
