A team of researchers from China University of Geosciences, has concluded that eclogite samples found at the northern Central Orogenic Belt within the North China Craton, show that modern-type subduction events occurred on Earth as far back as 2.5 billion years ago. They published their work in Proceedings of the National Academy of Sciences.
Click here for original story, Eclogite samples found in China push modern-type subduction events back to 2.5 billion years ago
Source: Phys.org