Significance of halogens (F, Cl) in kimberlite melts: insights from mineralogy and melt inclusions in the Roger pipe (Ekati, Canada) - Abersteiner, A.; Kamenetsky, V.S.; Pearson, D.G.; Kamenetsky, M.; Goemann, K.; Ehrig, K. (International Kimberlite Conference: Extended Abstracts, 2017)