Abstract
Interference between discordant tectonic trends in the central Apennines (Italy) was investigated in a palaeomagnetic study of the arc-shaped E-W- to N-S-oriented overthrust units of the Lazio-Abruzzi carbonate platform (Gran Sasso), and the underlying N-S-oriented imbricates of the Marche pelagic domain (Mt. dei Fiori). Samples were taken from 26 sites in the Cretaceous-Palaeogene Scaglia formation and in the Messinian-lower Pliocene Laga flysch. Stepwise thermal demagnetization was used to remove secondary components, and a stable direction of the characteristic remanent magnetization (ChRM) was determined for 24 sites. The palaeomagnetic results point to counter-clockwise rotation of the Marche domain similar to that of the southern Umbria. Directions in both the Scaglia and Laga formations of the Lazio-Abruzzi units show counter-clockwise rotations up to 90° in the easternmost segment of the Gran Sasso belt. This setting may be framed in a structural context wherein superposition of the E-W-oriented Gran Sasso belt onto the N-S-oriented Marche imbricates derives from progressive rotation of the Lazio-Abruzzi platform, decoupled by right-lateral shearing along the N-S-oriented Rigopiano-Bussi-Rivisondoli shear zone.
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