https://youtu.be/xt2av_64TI0

Did modern-style plate tectonics shape our planet since its early history, or did a different kind of crustal movement dominate for the first few billion years? Scientists grapple with this fundamental question about Earth's past, trying to infer processes from the sparse, ancient rock record. Different ideas range from a "stagnant lid" or "drip tectonics" scenario in the Hadean and Archean to the uniformitarian view that plate tectonics, similar to today's rigid plate movement above a convecting mantle, has been active all along. Understanding this transition is crucial for comprehending how the planet we live on today came to be. Recent research uses a massive dataset of basalt geochemistry from the past 4 billion years preserved in continental crust to shed new light on this debate. By analyzing the chemical composition of ancient basalts, which act like "time capsules" carrying information about mantle conditions and melting processes, scientists are revealing continuous trends in Earth's evolution. The surprising findings suggest that the observed geochemical evolution, including changes in element abundances and ratios, can be explained by plate tectonic processes influenced by a gradually cooling mantle, rather than requiring a fundamental shift in the style of tectonic activity. This geochemical evidence, including the consistent average water content in basalts and unchanging subduction signatures over vast stretches of time, supports an interpretation that modern-style plate tectonics, modified by Earth's cooling, has been operating throughout much of recorded Earth history. P. Geo. Ricardo A Valls, M. Sc. and Geo Gadfly Valls Geoconsultant ORCID ID- https://orcid.org/0000-0002-5421-0914 Scopus Author ID: 7003369619/35335510700 ResearcherID: S-6604-2018 If you like this content, please "buy me a coffee" https://www.buymeacoffee.com/goldendroplets