Fig. 5: Bulk xenolith concentrations of incompatible trace and volatile elements (H2O and F) in orthopyroxene-rich garnet harzburgites from the Kaapvaal craton of southern Africa normalised to MORB source upper mantle36.
From: The role of C-O-H-F-Cl fluids in the making of Earth’s continental roots
Elements increase in incompatibility during mantle melting from right to left. Incompatible trace element concentrations in our samples of orthopyroxene-rich garnet harzburgites resemble those in the dataset of ref. 9. All of the orthopyroxene-rich garnet harzburgites are depleted in Ti and the heavy rare-earth elements relative to other types of peridotites (lherzolites, harzburgites and dunites). Diamondiferous orthopyroxene-rich garnet harzburgite (BD2125) exhibits the greatest relative enrichments in H2O, F, Pb, Th and U and depletion in Rb. Data are from this work (Supplementary Data 1) and ref. 9.
