Fig. 4: Similar covariation trends between oceanic and continental basalts.
From: Widespread PREMA in the upper mantle indicated by low-degree basaltic melts
a–d, i–l Box and whisker plots and e–h, m–p median absolute deviations (MAD) of the Sr–Nd–Hf–Pb isotope compositions of global Cenozoic sodic basalts divided into four groups based on Nb–N. Nb–N represents Nb contents normalized to the primitive mantle18. The “n = X” represents the sample number. The box defines the 25th–75th percentiles, with the line in the box marking the medium value and the whiskers standing for 0th to 100th percentiles, excluding outliers.
