4 Billion Years Old – Earth’s Oldest-Known Rocks Provide Clues About Early Tectonics

new geochemical evidence obtained from Earth’s oldest-known rocks—found in remote lake regions of northern Canada—paints a starkly different picture of Earth’s earliest history.

“Our oldest samples show no sign of surficial material recycling at 4.0 Ga

https://scitechdaily.com/4-billion-years-old-earths-oldest-known-rocks-provide-clues-about-early-tectonics/?expand_article=1 #4GA #geology #tectonics #recycling