Figure 3

Oxygen isotope data for the Central Andes. (a,b) Variation in new (in bold) and literature δ¹⁸O values for olivine (a) and pyroxene (b) obtained by conventional (i.e. Parinacota⁶) and laser fluorination and displayed as box-and-whisker plots. Note that the new olivine and clinopyroxene data have higher average δ¹⁸O values for olivine and pyroxene than mantle-derived basalts (average = 4.8‰ ± 0.2, n = 104 for olivine and average = 6.1‰ ± 0.3, n = 16 for pyroxene²⁵). Further details of published data are given in Supplementary Tables S2 and S3.