Magmatismo triassico delle Dolomiti Occidentali = Triassic Magmatism of the Western Dolomites

In this study we have analyzed 8 samples coming from some lava flows, an intrusion and a dyke in the Dolomites. These rocks are related to a Ladinian volcanic event linked with the opening of some basins on the eastern margin of Pangea during the last stages of the subduction of the Paleotethys Ocean under the Eurasiatic margin. Petrographic analysis of the thin sections, chemical analysis of bulk rock with XRF and analysis of the single minerals with EMPA permit us to classify the samples and allow us to observe the behavior of major and trace elements with fractionation. We have used the clinopyroxene- liquid thermobarometer (Putirka, 2003) to calculate the crystallization temperature and pressure of the magma in magmatic chamber. It is probably that the magma was originated by partial melting of a continental lithosphere that inherited the geochemical imprint of the previous Varisic orogenesis.