Earth's Plate tectonics Evolution Uncertain
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tectonic platesLive Science
•When did plate tectonics begin?
77% Informative
Geologists don't have a good answer for when plate tectonic plates emerged.
Estimates range from 700 million years ago to before 4 billion years ago , when Earth was still in its infancy.
The oldest unambiguous evidence of modern tectonics dates to the Neoproterozoic .
But many geologists think this is too conservative.
Some studies of Earth 's oldest zircons show plate tectonics existed in Hadean conditions.
The oldest rocks might also be weird — perhaps they're still hanging around today because they weren't like all the other rocks on ancient Earth .
"It's shocking to realize there's no consensus view on when plates started," Jesse Reimink , a geoscientist.
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