Tettonica e magmatismo nell’Appennino settentrionale lungo la geotraversa Isola del Giglio- M.ti Sibillini.

In this paper a geologic cross-section extending from Isola del Giglio to the Sibillini Mountains has been studied. This section provides a good exemple of the relationship between tectonics and magmatism during the Neogene to Quaternary evolution of the Northern Apennines (Italy). Its structural setting supports the hypothesis of crustal deformations by simple shear progressively migrating eastward towards the Adriatic foreland, resulting in thinning and stretching of the Tyrrhenian hinterland. the geochemistry of the igneous rocks, whose major elements have been investigated on the basis of statistical criteria, appears to be consistent with a continental extensional tectonic environment and with the possibility of a small number of different parental magmas located at well defined structural levels (crust, mantle lithosphere, mantle astenosphere). The tectonic setting of the igneous centers testifies that their emplacement post-dates the main low-angle extensional deformations, being allowed by a late vertical tectonics, possibly related to rebound processes. The kinematic and volcanotectonic evolution of the studied area appear to be closely linked together and explainable in terms of a coherent geologic model concerning the evolution of the Tyrrhenian "rift" zone.