Evidence of ghost plagioclase signature induced by kinetic fractionation of europium in the Earth's mantle.

ABSTRACT: Crustal recycling in the Earth's mantle is fingerprinted by trace-element and isotopic proxies in oceanic basalts. Positive Eu and Sr anomalies in primitive lavas and melt inclusions that are not otherwise enriched in Al₂O₃ are often interpreted as reflecting the presence of recycled, plagioclase-rich oceanic crust in their mantle source - referred to as "ghost plagioclase" signatures. Here, we report natural evidence of Eu anomalies and extreme crystal-scale heterogeneity developed kinetically in mantle peridotite clinopyroxene. Numerical modelling shows that diffusional fractionation between clinopyroxene and melts can account for this intra-crystal heterogeneity and generate Eu anomalies without requiring plagioclase. We demonstrate that kinetically induced Eu anom

SUBMITTER: Tilhac R 

PROVIDER: S-EPMC9968321 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature