Researchers say 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.
Researchers at Arizona State University conducted a series of experiments where they compressed an iron-carbon alloy and water together to the pressure and temperature expected at the earth’s core-mantle boundary, melting the iron-carbon alloy.
Shim explained that because carbon is an iron-loving element, significant carbon is expected to exist in the core, while the mantle is thought to have relatively low carbon. However, scientists have found that much more carbon exists in the mantle than expected. “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,” he said.
He and his collaborators also predicted that diamond-rich structures can exist at the core-mantle boundary and that seismic studies might detect them because seismic waves should travel unusually fast through the structures.
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