Rare minerals show evidence of an ancient subduction zone.
A unique rock formation in China holds clues that tectonic plates subducted, or went underneath other plates, during the Archean eon , just as they do nowadays, a new study finds. This 2.
5 billion-year-old rock, known as eclogite, is rare, forming when oceanic crust is pushed deep into the mantle at relatively low temperatures. This type of high-pressure, low-temperature rock is "largely confined to subduction…
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