The Innsbruck Quartzphyllite Complex (IQP), the Kellerjochgneiss (KG) and the Wildschnau Schists (WS) are part of the Austroalpine basement nappes north of the Tauern Window. These tectonic units occur in the northern Zillertal and in this study we present P-T data from all three units. The quartzphyllites of the IQP contain the mineral assemblage muscovite + albite + quartz + chlorite +/- biotite, which is identical to the mineral assemblage in the WS. In the KG remnants of the magmatic precursor mineral assemblage K-feldspar + albite + previously Ti-rich biotite porphyroblasts are present. The Eo-Alpine mineral assemblage consists of muscovite + biotite + albite + chlorite + quartz +/- stilpnomelane. P-T estimates obtained with multi-equilibrium geothermobarometry (THERMO-CALC v.3.1, TWQ v.1.02) of a biotite-bearing quartzphyllite sample from the IQP range from 3.8 kbar to 5.9 kbar and 296 to 360 degrees C. Lack of biotite in most of the samples of the IQP prohibits calculations of invariant intersections and consequently, only limiting pressure estimates of 3.5 kbar to 6 kbar in a temperature range of 300-400 degrees C, based on the reaction paragonite + celadonite = muscovite + albite + clinochlore + quartz + H2O, can be obtained. Greenschist intercalations of the eastern IQP contain the mineral assemblage 2 amphibole + biotite + clinozoisite + albite + quartz. P-T conditions ranging from 325 +/- 12 degrees C to 360 +/- 42 degrees C and 4.5 +/- 1.7 to 5.4 +/- 1.8 kbar, based on the application of multi-equilibrium geothermobarometry, were obtained. Multi-equilibrium geothermobarometry of the KG yielded pressures of 4.1 kbar to 6.8 kbar at temperatures of 290 degrees C to 370 degrees C for the majority of all samples. Lack of biotite in most of the samples of the Wildschnau Schist hampered geothermobarometric calculations and only one sample yielded pressures of 4.9 kbar to 7.5 kbar and temperatures ranging from 300 degrees C to 380 degrees C. Stilpnomelane-muscovite-quartz geothermobarometry yielded P-T conditions of 4.3-5.7 kbar and 300-370 degrees C for all three units. Based on similar microstructural evidence and previously published geochronological data it can be inferred that the P-T data of this investigation from these basement nappes in the northern Zillertal represent the Eo-Alpine metamorphic overprint. The data also indicate that the units of this investigation (KG, IQP, WS) underwent a similar Eo-Alpine tectonic evolution.
