One Rock Records Two Types of Subduction
Researchers have discovered a rock in Papua New Guinea that provides evidence of a complex subduction process, showing a transition from hot to cold thermal conditions at depth. This finding challenges existing geological models regarding how tectonic plates behave as they sink into the Earth's mantle.
Why it matters
This discovery forces a re-evaluation of thermal models for subduction zones, which are critical for understanding volcanic activity, earthquakes, and long-term climate stabilization.
When two tectonic plates collide, one plate sinks below the other - a process known as "subduction". An international research team led by G ttingen University has discovered a rock in Papua New Guinea that, four million years ago, travelled over 90 km down into a subduction zone. The rock records an unusual journey, with higher-than-expected temperature conditions at a depth of around 45 km. This change from very hot subduction at this depth to the more common colder subduction at its final depth challenges scientists' view of the thermal structure of subduction zones. The results were published in Nature Geoscience.
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