Some of the Oldest Rocks Ever Discovered Shed Light on Earth's Early History
Researchers say the rocks formed from material carried more than 50 kilometers underground, offering clues to early crust growth and possible subduction.
4 Articles
4 Articles
Some of the oldest rocks ever discovered shed light on Earth's early history
Earth is approximately 4.5 billion years old, according to estimates. However, rocks dating back to the planet's earliest days are extremely rare. Hence the excitement over the discovery in northern China of some of the oldest known rocks on Earth, dating back 3.95 billion years. And one of the reasons for all the attention is that they're revealing new clues about how Earth's crust formed and evolved.
From the early days of the earth there are hardly any rocks that have preserved their original history of origin. A 3.95 billion-year-old gneiss from northern China now contains chemical traces of crust, which was initially altered near the surface and then sunk deeply. This could indicate an early, temporary form of subduction. Beijing (China). When began the [...] The article Earth's crust probably sunk down already 3.95 billion years ago appe…
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