Via Futurity.org:
Geochemical evidence from volcanic rocks collected on Baffin Island in the Canadian Arctic suggests that a region of mantle beneath the Earth’s surface has largely escaped billions of years of melting and geological churning.
The discovery appears to offer clues to the early chemical evolution of the Earth.
The newly identified mantle “reservoir” dates from just a few tens of millions years after the Earth was first assembled from the collisions of smaller bodies....
