Fig. 5

KI-VR plot of all samples studies at the Austroalpine—Penninic boundary. In the grey area with samples marked with a star the high smectite content is related to weathering, retrograde diagenetic smectitisation or a very low-grade hydrothermal alteration of illite and chlorite (partly the discrete smectite peak shows interference with illite). In the grey triangle in the left lower corner of the plot (small KI at low VR) a detrital illite-muscovite component is suggested from the lithofacies or assumed due to interferences of different illite populations. In the white area between it is regarded that illite is neither affected by a detritus content nor by a high amount of smectite. For further correlation only the last sample group was used