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Fig. 9 | Swiss Journal of Geosciences

Fig. 9

From: Polyphase movement on the Lavanttal Fault Zone (Eastern Alps): reconciling the evidence from different geochronological indicators

Fig. 9

Results of fission track and (U-Th)/He thermal history modelling using the HeFTy program package (Ketcham 2005). The lower temperature parts of the models are taken from Wölfler et al. (2010). a Thermal history model of HR sample (106HR) from drilling KB-D12/02 calculated from AFT and ZFT ages. b Thermal history model of HR sample (426HR) from drilling TB-D12/02 calculated from AFT and (U-Th)/He ages. Light gray paths: acceptable fit; dark grey paths: good fit; thick black line: representative best fit line. AFT modelling: input parameters: weighted mean AFT age with 2σ error, track length distribution, Dpar values as kinetic parameters; multi-kinetic annealing model of Ketcham et al. (1999). Additional geological information like ZFT data was converted into time–temperature constraints in form of boxes for the modelling. The end of the time–temperature paths was set at 20°C. (U-Th)/He modelling: input parameters: uncorrected (U-Th)/He age with 1σ error, sphere radius; activation energy 32.9 kcal/mol; calibration after Farley (2002). MTL mean track length; SD standard deviation in μm; GOF goodness of fit (statistical comparison of the measured input data and modelled output data; a “good fit” corresponds to a value 0.5 or higher, the “best fit” corresponds to the value 1; boxes with dashed lines: constraints according to the different partial annealing (ZPAZ, APAZ) and retention zones (HePRZ)

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