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Researchers at Washington University in St. Louis have quantified the vast amount of water cycled into Earth's deep mantle through subduction zones. Their study, published in Nature Geoscience, estimates that over 3.6 billion years, 1.5 to 2.5 times the current ocean volume has been transported into the mantle. They used seismic imaging of deep mantle structures and mineral physics models to track ancient water pathways. This suggests a dynamic deep-Earth water reservoir profoundly influencing planetary processes.
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Why It’s Fascinating
Experts were surprised by the sheer scale and long-term consistency of this deep Earth water cycle, which significantly impacts our understanding of Earth's internal processes and habitability. This overturns simpler models that viewed the mantle as a relatively dry, static environment, confirming it as a dynamic reservoir. In the next 5-10 years, this understanding could refine models for volcanic activity prediction and the long-term stability of Earth's atmosphere. Think of Earth as a giant sponge constantly soaking up and releasing water, not just on the surface but deep within. Geologists and climate scientists benefit most from this, understanding the planet's long-term evolution. How does this deep water influence the start and stop of plate tectonics?
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