Studies of mid-ocean ridge basalts (MORBs) show a variable Fe isotope composition of the oceanic upper mantle, beyond explanation by processes of mantle melting from a uniform source and magma evolution, indicating Fe isotope heterogeneity in the oceanic upper mantle. However, the origin of upper mantle Fe isotope heterogeneity remains enigmatic.
Click here for original story, Study reveals low-degree melt metasomatic origin of heavy Fe isotope enrichment in mid-ocean ridge basalt mantle
Source: Phys.org