Fig. 7
From: Timing and conditions of brittle faulting on the Silltal-Brenner Fault Zone, Eastern Alps (Austria)
Plot of K–Ar age (Ma, error bars from Table 2 are not visible on the plot) against recalculated wt% K2O extrapolated to 100 % 2M1 component. Only the results for fractions finer than 6 μm are plotted. Also shown for reference are the range of 40Ar/39Ar ages (Rockenschaub et al. 2003) and wt% K2O for muscovites (Piber and Tropper 2007; Piber et al. 2008) determined from the Innsbruck Quartz Phyllite in the immediate footwall and the Patscherkofel Crystalline Complex klippe (Fig. 2). 40Ar/39Ar results for white mica from the Innsbruck Quartz Phyllite typically give Late Permian or Triassic to Jurassic ages (upper green box); the Patscherkofel Crystalline Complex shows a wide range but with two main peaks at around 149–180 Ma (middle green box) and 123–136 Ma (included in lower box), but one retrograde mylonitic gneiss from the base of the Complex has a white mica 40Ar/39Ar age spectrum with steps between 50 and 120 Ma (included in lower box). Data table for the plot is available in Online Resource 3