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Record concentrations of a helium isotope found inside 62-million-year-old Arctic rocks could be the most compelling evidence to date of a slow leak in our planet's core.of ancient lava flows, a team of geochemists from Woods Hole Oceanographic Institution and the California Institute of Technology are now more certain than ever that helium trapped in the core as our planet was forming is making its way to the surface.
That makes helium a surprisingly rare material on the planet's surface. Yet just how much of the element remains trapped deep beneath our feet is one of the great unknowns in geology. Without ruling out the possibility of a coincidence, Horton and his team wondered if both hotspots may have received their helium from an ancient reservoir adjacent to the mantle.
, the team could rule out factors that may have altered the helium's identity post-eruption, building an even stronger case for the gas's unusual origins.
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