Geochemical stratification in the upper mantle beneath NE China

Abstract

Compositions of primary magmas were estimated for Cenozoic Mg‐rich basalts from the NE China region based on the olivine maximum fractionation model. These data together with available experimental data gave an estimate for magma segregation depth for each basalt magma, which is inversely correlated with 87 Sr/ 86 Sr isotopic ratio and positively correlated with 143 Nd/ 144 Nd isotopic composition. This observation may provide convincing evidence that the enriched upper mantle is underlain by more depleted asthenosphere mantle reservoir.