GEODINAMICA DELL'APPENNINO SETTENTRIONALE E SUE RIPERCUSSIONI NELLA EVOLUZIONE TETTONICA MIOCENICA

Abstract

Starting from recently acquired or revised geophysical data in the fields of gravimetry, aeromagnetics, heat flow, seismic refraction profiling and seismic tomography a ge­odynarnic scenario of the northern Appennines - northern Tyrrhenian Sea system is presented which shows, in a tran­sect from Corsica basin to Northern Adriatic Sea, the fol­lowing structural provinces: i) a western extended area, in­duding inner Tuscany and Tyrrhenian Sea, characterized by an astenospheric uplift, where extensional processes dominate; ii) a centrai complex area, from pre-Apennines to foothills, where extensional or transtensional processes oc­curring at upper crustal levels, are piloted by compressive stresses documented at depth by earthquakes aligned in a west-dipping plane iii) a stable central-adriatic foreland. This a scenario confirms the simultaneity of compression and ex­tension in adjacent sectors of the thrust and fold belt. A reap­praisal of the Miocene tectonic evolution of northern Apen­nines is outlined transferring the present geodynamic model to that period. [...]