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Relamination: A mechanism that has been shaping continents for billions of years

phys.org·Spanish National Research Council·28 days ago
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Credit: Pixabay/CC0 Public Domain An international team led by researchers from the National Museum of Natural Sciences (MNCN-CSIC) has identified a key mechanism that has shaped Earth's continents over billions of years. This mechanism is the deep re-lamination of subducted continental crust, a process that explains the origin of certain magmas and offers a new perspective on continental evolution from the Archean (between 3.8 and 2.5 billion years ago) to recent times. The study, published in the journal Nature Geoscience , combines numerical geodynamic modeling and high-pressure experiments to unravel how fragments of continental crust can give rise to hybrid magmas that fuel major magmatic events following continental collisions, generating new crust. During continental collisions, one plate sinks beneath another—a process known as subduction.…

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