De Faveri, Ilaria (2013) Vulcanismo permiano in Trentino Alto Adige. [Laurea triennale]
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The Athesian Volcanic Group extends over more than 2000 km2 and consist of 2 km tick suites of calc-alkaline volcanic and subvolcanic rock. The magmatic rocks comprise of domes and lava flows, pyroclastic and surge deposites and ignimbrites. This work analyzes this volcanism in the South-Est of Trento and Bolzano area and compare it with the sample from Orobic volcanic rocks. Geochemical analysis show the major and trace elements contents and we notice that a process of magmatic differentiation led to silica contenents which are higher in Orobic sample. Through the trace element anlalysis we reconstruct which minerlas crystallized and the consequence of it. The analysis suggest at least that we are in a volcanic arc geodynamic context in contrast whit the more widespread idea of a stretching system. The explanation of this results can be found in a melting of Varisican crust or a high contamination of mantle melts, that could express geochimical value of trace similar to our analysis.
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