Electronic Annexes

• W4946-Ea-1.csv: Spreadsheet with 756 training data of known tectonic affinity, analysed for 49 elements and isotopic ratios. All concentrations are in ppm. This file is used as input to the R-script W4946-Ea-2.R

• W4946-Ea-2.R: R-script for the construction of ratio-based classification trees, using the input file W4946-Ea-2.R