Matrix glasses and glass inclusion major elements were measured by electron microprobe, whole rock major elements were determined by XRF and whole rock trace element analyses were analysed by solution ICP-MS (see main text in Beier et al. (2017) for analytical methods). Trace element concentrations marked with # were determined by XRF. Major elements are given in [wt.%], trace elements originally given in [ppm], here as [mg/kg].