Unexpected temperature shift challenges models of Earth’s interior
A surprising temperature boundary deep within Earth
Scientists studying a rock from Papua New Guinea have identified an unexpected temperature pattern at a depth of more than 90 kilometers beneath Earth’s surface. Rather than showing the conditions expected from established models of the planet’s interior, the rock indicates a shift from unusually hot conditions to relatively cold ones.
The finding could reshape scientific understanding of how heat is distributed inside Earth. Researchers say it may also affect models of tectonic plate movement, earthquakes, and volcanic activity, all of which are closely connected to processes occurring deep within the planet.
Because the rock provides a physical sample of an environment that is otherwise difficult to observe directly, it offers an unusual opportunity to test prevailing theories about Earth’s interior. The temperature reversal does not by itself explain how it formed or what broader consequences it has, but it indicates that current models may not fully capture the complex thermal conditions at those depths.