New research shows Earth’s core contains 90% of Earth’s sulphur (equivalent to 10% mass of the Moon)

Schematic evolution of copper concentration and isotopic composition of Earth’s mantle as modelled in this contribution. Earth accretes as a mixture of chondrites such that the bulk Earth Cu isotope composition is δ⁶⁵CuCBE. Core formation sequesters ~60 % of Earth’s Cu in the metal phase, which is enriched in the heavy isotope, driving Earth’s mantle to a lighter composition. The formation of a Fe-O-S layer, the “Hadean Matte”, sequesters isotopically light Cu, driving Earth’s mantle to its present day composition (δ⁶⁵CuBSE)