Researchers find rust and diamonds at the Earth's core-mantle boundary. On the Earth's surface, steel rusts due to water and air. But what about deep inside the interior of the Earth? The biggest carbon storage on Earth is the Earth's core, where 90% of the carbon is buried. Scientists have show
to conditions similar to those at the Earth’s core-mantle boundary, melting the iron-carbon alloy.
“Temperature at the boundary between the silicate mantle and the metallic core at 3,000 km depth reaches to roughly 7,000 F, which is sufficiently high for most minerals to lose H2O captured in their atomic-scale structures,” said Dan Shim, professor at ASU’s School of Earth and Space Exploration. “In fact, the temperature is high enough that some minerals should melt at such conditions.”
“Carbon is an essential element for life and plays an important role in many geological processes,” said Ko. “The new discovery of a carbon transfer mechanism from the core to the mantle will shed light on the understanding of the carbon cycle in the Earth’s deep interior. This is even more exciting given that the diamond formation at the core-mantle boundary might have been going on for billions of years since the initiation of subduction on the planet.
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