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Tectonics and sedimentation in the outer northern apennines

Keywords: Outer Northern Apennines, marker horizons, olistostromes, synsedimentary tectonics, active tectonics.
Fig. 1. Geologic map of the Liguride overthrust in the Western Tuscany-Romagna Apennines (Landuzzi, 2005).
Fig. 2. Regional geologic cross-section from the Mugello basin (Tuscany) to the Po Plain (Emilia) (Bernagozzi, Landuzzi & Vai, 2005).

In the mountain range bounded to the S by the Mugello and the Casentino basins, to the W by the Sillaro valley and to the E by the Conca valley, a study of the tectono-sedimentary relationships between the Umbria-Romagna foredeep and the Liguride nappe allows us to deeply understand chronology and style of the Apennine deformation. Synsedimentary folds and subsequent thrusts affect the foreland/foredeep succession; low angle normal faults are confined within the nappe; active high angle normal faults dismember the Apennine building from the Tyrrhenian See to the Po - Adriatic side of the mountain belt.

This research activity, carried out in collaboration with the Departments BiGeA (University of Bologna) and FST (University of Ferrara), focuses at the following subjects: (1) physical correlation of marker horizons in the foredeep successions, with individuation of time-equivalent surfaces in the semi-allochthonous successions; (2) recognition of synsedimentary folds in the inner part of the Umbria-Romagna foredeep; (3) reconstruction of the Apennine front in the Miocene, based on olistostromes and their peculiar sedimentary covers; (4) discrimination between reactivation and passive displacement of the Liguride overthrust; (5) mapping and interpretation of the low angle normal faults confined within the Liguride nappe; (6) analysis of the relationships between recent uplift and active high angle normal faults. This research activity makes use of classical techniques of geological mapping and elaboration; seismic profiles and borehole data provided by hydrocarbon exploration companies are used for calibration at depth of geological cross-sections.

From 2008 onwards, the greatest attention is given to the subjects (5) and (6), because of their implications in the geological modeling of large scale landslides of particular interest for other DICAM research activities.

Main publications

Zattin, M., Landuzzi, A., Picotti, V. and Zuffa, G.G., Discriminating between tectonic and sedimentary burial in a foredeep succession, Northern Apennines, J. Geol. Soc. London, 157, 2000, pp. 629- 633.

Barchi, M., Landuzzi, A., Pialli, G.P. and Minelli, G., Outer Northern Apennines (Vai, G.B. and Martini, I.P. Eds.) Anatomy of an Orogen, 2001, Kluwer Academic Publishers, pp. 215-254.

Pini, G.A., Lucente, C.C., Cowan, D.S., De Libero, C.M., Dellisanti, F., Landuzzi, A., Negri, A., Tateo, F., Del Castello, M., Morrone, M. and Cantelli, L., The role of olistostromes and argille scagliose in the structural evolution of the Northern Apennines, Memorie Descrittive della Carta Geologica d’Italia, 63, No. 1, B13, 2004, pp. 1- 40.

Roveri, M., Landuzzi, A., Bassetti, M.A., Lugli, S., Manzi, V., Ricci Lucchi, F. and Vai, G.B., The record of Messinian events in the Northern Apennines foredeep basin. Memorie Descrittive della Carta Geologica D’Italia, 63, No. 2, B19, 2004, pp. 1-46.

Bernagozzi, G., Landuzzi, A. and Vai G.B., I percorsi nascosti. Il tracciato alta velocità Bologna- Firenze (Gruppo di studi Savena Setta Sambro, Eds.), Valli di Zena, Idice e Sillaro, 2005, Geo- Lab, Bologna, pp. 324-342.

Landuzzi, A., Sin-depositional advancement of the Liguride allochthon in the Miocene foredeep of the Western Romagna Apennines (Italy) (Venturini, C., Pasquarè, G. and Groppelli, G., Eds.), Mapping Geology in Italy, 2005, APAT, Rome, pp. 219-226.

Giacchetti, G., Marchi, G., Benedetti, G. and Landuzzi, A., Design of emergency landslide remediations supported by finite and distinct elements analysis. Proc. of the 33rd International Geological Congress 2008, Oslo, Norway, August 6th – 14th.

Gatta, G., Landuzzi, A. and Zanutta, A., La fotogrammetria d’archivio per lo studio della frana di Scascoli (Bologna). Atti della 15a Conferenza Nazionale ASITA, Colorno (Parma), 15-18 Novembre 2011, pp. 1129 – 1137.

Marchi, G., Giacchetti, G., Benedetti, G. and Landuzzi, A., The Scascoli Case Study: Design and Safety Measures for a Landslide Area, The second world landslide forum, Roma, 3-9 October 2011, Landslide Science and Practice, 6, Springer-Verlag, Berlin, Heidelberg, 2013, pp. 199 – 206.

Borgatti, L., Guerra, C., Nesci, O., Romeo, R.W., Veneri, F., Landuzzi, A., Benedetti, G., Marchi, G. and Lucente, C.C., The 27 February 2014 San Leo landslide (Northern Italy), Landslides, 12, 2015, pp. 387 – 394.