Some petrological and geochemical constraints on the genesis of the Baveno-Mottarone and Montorfano plutonic bodies

Abstract

New data on zircon typology and trace element distribution for Baveno-Mottarone and Montorfano late-Hercynian plutonic intrusions are reported. Trace element distribution suggests that granitoid rocks, characterized by an overall calc-alkaline affinity, were generated by crystal fractionation processes starting from hybrid melts («appinitic dykes?»). These latter were probably produced by interaction of mantle derived melts with crustal material. Zircon typology and trace elements suggest two main magmatic trends: 1) «appinitic dykes» + Mergozzo granite; 2) Mottarone granodiorite + Montorfano granite. The interpretation of the more alkaline Baveno pink granite is at present controversial and different petrogenetic mechanisms may be envisaged

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