A càrrec de Paola VANNUCCHI (Dipartimento di Scienze Della Terra, Università degli Studi di Firenze, Itàlia)
Organitzat conjuntament CSIC-UB

Dia=08 de juny de 2010
Hora = 12:00
Lloc = Sala d'actes de l'Institut Jaume Almera

Descripció:
Tectonic erosion of the overriding plate by the down-going slab is believed to occur at half the Earth's subduction zones. In situ investigation of the geological processes at active erosive margins is extremely difficult owing to the deep marine environment and the net loss of forearc crust to deeper levels in the subduction zone. Until now, a fossil erosive subduction channel-the shear zone marking the plate boundary-has not been recognized in the field, so that seismic observations have provided the only information on plate boundary processes at erosive margins. This talk aims at showing that a fossil erosive margin is preserved in the Northern Apennines of Italy. It formed during the Tertiary transition from oceanic subduction to continental collision, and was preserved by the late deactivation and fossilization of the plate boundary.