Phys.org August 30, 2024 Thermochemical inhomogeneities in the Earth’s outer core that enhance our understanding of the geodynamo have been elusive. Seismic constraints on such inhomogeneities would provide clues on the amount and distribution of light elements in the core apart from iron and nickel. Researchers in Australia found evidence for a low-velocity volume within the outer core via the global coda correlation wavefield. Several key correlogram features with a unique sensitivity to the liquid core showed variations with wave paths remarkably slower in the equatorial than polar planes constrained a torus structure at low latitudes with lower velocity than […]
Tag Archives: Earth’s core
Further evidence of Earth’s core leaking found on Baffin Island
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 […]