Earth’s core is leaking gold

Contrary to conspiracy theories, the Earth’s core isn’t hollow. The dense, hot ball instead contains a stew of precious metals including platinum, ruthenium, and pretty much all of the planet’s gold. As lucrative as that sounds, there’s essentially no way humanity will ever access this natural treasure chest buried beneath more than 1,850  feet of solid rock. But according to recent discoveries made at volcanoes in Hawai’i, trace amounts of some of those coveted metals are seeping up from the planet’s deepest reaches.

“When the first results came in, we realized that we had literally struck gold,” Nils Messling, a geochemist at Göttingen University, said in a statement. “Our data confirmed that material from the core, including gold and other precious metals, is leaking into Earth’s mantle above.”

Messling and collaborators explained their findings in a study published on May 21 in the journal Nature. The team recently detected trace amounts of the precious metal ruthenium while analyzing volcanic rock samples collected across the islands of Hawai’i. More specifically, they noted the unexpected presence of the ruthenium isotope, ¹⁰⁰Ru.

“Unexpected” is the key word there. While ¹⁰⁰Ru does exist in Earth’s mantle, it’s slightly more abundant inside of the core—alongside 99.999 percent of the planet’s gold and other precious metals. That’s because during the planet’s formation about 4.5 billion years ago, some of the ruthenium that is locked inside Earth’s core originated from a different source than the small amount found in the mantle today. The discrepancies between these two forms of ruthenium is so slight that the equipment used by geologists to study these isotopes hasn’t been able to tell the two apart.

However, researchers at Göttingen University in The Netherlands recently developed new isotopic analysis methods that allowed them to do just that. In differentiating between these two types of the same isotope, the team discovered that some of Hawai’i’s volcanic basalts contain an unusually high ¹⁰⁰Ru signal meaning it must have originated from near the core-mantle-boundary.  

The ramifications are significant: Earth’s core, once thought inaccessible, is ejected at least small amounts up towards the surface during volcanic eruptions.

“We can now also prove that huge volumes of super-heated mantle material—several hundreds of quadrillion metric tons of rock—originate at the core-mantle boundary and rise to Earth’s surface to form ocean islands like Hawaii,” added study co-author Matthias Wilbold.

The question now isn’t if this unexpected process happens—it’s a question of if and when it’s happened in the past.

“Our findings open up an entirely new perspective on the evolution of the inner dynamics of our home planet,” added Messling.

 

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