Evidence of ‘modern’ tectonic plates dated to 2.5 billion years ago found in China

A unique rock formation in China holds clues that tectonic plates subducted, or passed under other plates, during the Archean eon (4 billion to 2.5 billion years ago), just as they do today, according to a new study.

This 2.5 billion-year-old rock, known as eclogite, is rare, forming when oceanic crust is pushed into the mantle (the layer between the crust and the core) at relatively low temperatures. This high-pressure, low-temperature rock type is “largely confined to subduction zones on present-day Earth,” study co-lead researchers Timothy Kusky and Lu Wang, Earth scientists at China’s University of Geosciences, told the BBC. Live Science in an email. .

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