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A study by researchers from the University of Sydney has revealed a surprising global deceleration in the rate of seafloor spreading at mid-ocean ridges over the past 19 million years. They found that the average global spreading rate has decreased by approximately 35%, from roughly 140 millimeters per year to 100 millimeters per year. The team analyzed magnetic anomalies recorded in the oceanic crust from every major ridge system, meticulously reconstructing past spreading velocities. This slowdown suggests a significant shift in the fundamental processes driving plate tectonics, potentially linked to changes in mantle convection or the forces acting on subducting slabs. This research, published in *Science Advances* in 2020, offers new insights into the long-term evolution of Earth's dynamic crust.
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Why It’s Fascinating
This discovery is intriguing because it indicates a fundamental, long-term change in the pace of Earth's tectonic engine, challenging assumptions of a relatively constant spreading rate. It overturns a simpler view of plate dynamics, confirming that the forces driving plate motion are themselves subject to significant temporal variations. In the next 5-10 years, understanding this deceleration could help refine models of global sea level changes and volcanic activity, as slower spreading affects both ridge volume and magma production. Think of Earth's tectonic conveyor belts slowly grinding to a somewhat slower pace, affecting how quickly new crust is formed and old crust is recycled. Geodesists, oceanographers, and geodynamicists benefit most, gaining critical data for understanding Earth's past and future geological evolution. What forces are responsible for this global deceleration, and what are the long-term implications for the planet's deep interior and surface environment?
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