Analysis of the fault pattern in the Lower Lanzo Valley (italian Western Alps) : a multi-scale integrated approach

Auteurs :
FUSETTI, E.
PERRONE, G.
MORELLI, M.
CADOPPI, P.

Description :
This work combines, at different scales, field mapping, detailed structural analysis, satellite images (Landsat TM and ASTER) and aerial photos interpretation for the study of the fault network affecting the Lower Lanzo Valley (Turin), a key-area of the inner Western Alps bordered by 2 major post-Oligocene tectonic discontinuities : the Canavese Line and the Col del Lis-Trana Deformation Zone. In the study area, where both the Sesia-Lanzo Zone (Austroalpine Domain) and the Lanzo Ultramafic Complex (Piemonte Zone) crop out, this integrated approach allowed distinguishing an E-W-striking major dextral transcurrent/transpressive fault system. The subsequent normal reactivation of the E-W faults may be related to the extensional regime that affected the inner Western Alps since the Early(?) Miocene, due to the progressive decrease of the convergence between the 2 plates and the subsequent prevailing of gravitational body forces inside the chain. Seismological data indicate that this stress regime is still ongoing. - (NF)


Type de document :
Article de périodique

Source :
Italian Journal of Geosciences (Testo stampato), issn : 2038-1719, 2012, vol. 131, n°. 2, p. 286-301, nombre de pages : 16, Références bibliographiques : 74 ref.

Date :
2012

Editeur :
Pays édition : Italie, Roma, Società Geologica Italiana