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Fig. 6 | Swiss Journal of Geosciences

Fig. 6

From: Discovery of Ordovician–Silurian metamorphic monazite in garnet metapelites of the Alpine External Aiguilles Rouges Massif

Fig. 6

P–T data and P–T path segments from mylonitic garnet gneisses, micaschists and eclogitic amphibolite of the Col de Bérard region. Large crosses represent P–T results from the Grt-Bt-thermometer of Bhattacharya et al. (1992) and the GASP barometer (see text) applied to metapelite garnet assemblages, enclosing an error of ±50°C and ±1 kbar. P–T data was recalculated from mineral-chemical analyses given in Schulz and von Raumer (1993) and updated analyses. Stability fields for Ky kyanite, And andalusite, Sil sillimanite; Cd+ cordierite-in, St+ staurolite-in; St- staurolite-out and Ms- muscovite-out with univariant reaction lines are given for overall orientation in P–T coordinates after Spear (1993). a P–T data for Mg-rich homogenized garnet cores and retrogressive rims in mylonitic garnet gneisses. b P–T data from micaschists from the western series. Clinopyroxene–garnet equilibria from eclogitic amphibolite mark a high-pressure amphibolite-facies stage. c P–T data from micaschist series to the E. Note marked different maximal temperatures in the micaschist series (E, W). d Interpretative summary of P–T data and EMP monazite ages in the Col de Bérard Region of the Aiguilles Rouges Massif. The high pressure stage recorded by the eclogitic amphibolites is assigned to the Variscan P–T evolution

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