An important part of this study focused on the kinematic and metamorphic significance of the aluminosilicates* veins within the framework of the alpine evolution. These veins are present in the metasediments* and are named Knauern* according to Keller (1968) [reference].

They have already been described by the works of Preiswerk (1918) [reference], Keller (1968) [reference] and Klein (1976) [reference].

As shown in the previous page, thermometry* by oxygen isotope* on quartz-kyanite pair in veins and surrounding metapelites* revealed concordant temperatures with those obtained by conventional thermobarometry* (620 to 720°C according to method and calibration of Sharp (1992, [reference], 1995 [reference])).

This confirms that these veins were formed during peak of metamorphism* (maximum of temperature) as suggested by our structural* study. The texture* analysis in veins demonstrate andalusite formation after retromorphosis of kyanite (see figures on the left and hereunder).