Fig. 10

Schematic profile (present day orientation roughly NW–SE) through the internal Western Alps in Rupelian times (inspired by Babist et al. 2006, their Fig. 10f) showing the position in the upper plate of the subduction zone of different portion of mantle peridotites having suffered distinct kinds of metasomatic alteration (see text for discussion). These represent potential sources for the generation of the primitive melts of the heterogeneous Oligocene magmatism in this area. The position of the melting zone have been located following current thermal model for the alpine subduction (e.g., Stöckhert and Gerya 2005)