Fig. 4: Correlations of whole-rock δ65Cu values with geochemical tracers used to infer the mantle source characteristics of the Emeishan lavas.
From: Copper isotope evidence for recycled crustal sulfides in deep mantle plume source
Whole-rock δ65Cu versus ΔFMQ (estimated oxygen fugacity) (a), Cu (b), and olivine/zircon δ18O (c). In Fig. 4a, the dividing line between Cu+ and Cu2+ is ∆FMQ + 1.239. b the modeling curves (solid colored lines) illustrate Cu isotope fractionation during mantle partial melting by Rayleigh fractionation model at variable Cu isotope fractionation factors (αmelt-peridotite) (see text and Supplementary Note 2 for details). Cu isotope sources of literature data are listed in Supplementary Note 2. Data source of oxidation states: the Dali low-Ti and Yumen high-Ti magmas30; MORB and Oceanic Arc71. Data source of oxygen isotopes: the Dali low-Ti and Yumen high-Ti magmas22,28; mantle value72 and oceanic arc73. Error bars for δ65Cu are 2 SD. Error bars of average ΔFMQ and δ18O values are 1 standard deviation.
