Evidence of ‘modern’ plate tectonics from 2.5 billion years ago found in China

Evidence of ‘modern’ plate tectonics from 2.5 billion years ago found in China

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

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

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