Boston MA (SPX) Apr 22, 2022

A handful of ancient zircon crystals found in South Africa hold the oldest evidence of subduction, a key element of plate tectonics, according to a new study published in AGU Advances, AGU’s journal for high-impact, open-access research and commentary across the Earth and space sciences.

These rare time capsules from Earth’s youth point to a transition around 3.8 billion years ago from a l
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