Phys.org   October 20, 2023 High 3He/4He ratios are thought to derive from the solar nebula or from solar-wind-irradiated material that became incorporated into Earth during early planetary accretion. Traditionally, this high-3He/4He component has been considered intrinsic to the mantle, having avoided outgassing caused by giant impacts and billions of years of mantle convection. A team of researchers in the US (Woods Hole Oceanographic Institution, Caltech) has shown the highest magmatic 3He/4He ratio in terrestrial igneous rocks, in olivines from Baffin Island lavas. According to them the extremely high-3He/4He helium in these lavas might have been derived from Earth’s core. The […]