Extended Data Fig. 5: Present-day global distribution of continental volcanic arcs, and their Sr isotope compositions.
From: Global chemical weathering dominated by continental arcs since the mid-Palaeozoic
Map of continental volcanic arcs identified by Cao et al.15. The labels (a-h) correspond to the density histograms, which show the relative frequency of 87Sr/86Sr points for each arc from the EarthChem Library (earthchem.org). The mean and mode of the dataset (total N=5498) are represented by vertical dashed lines. Note that the relatively high 87Sr/86Sr compositions of the Central Zone of the Andean Belt can be explained by the presence of extremely thick crust in this region (>70 km) and a higher degree of crustal assimilation66.
