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Geological and geophysical study of a thin-skinned tectonic wedge formed during an early collisional stage: the Trasimeno Tectonic Wedge (Northern Apennines, Italy)

Published online by Cambridge University Press:  27 June 2019

Filippo Carboni*
Affiliation:
Dipartimento di Fisica e Geologia, Università degli Studi di Perugia
Francesco Brozzetti
Affiliation:
Centro InteRUniversitario per l’analisi SismoTettonica tridimensionale con applicazioni territoriali (CRUST), Università degli Studi “G. d’Annunzio” Chieti-Pescara, Via dei Vestini, 66013, Chieti, Italy
Francesco Mirabella
Affiliation:
Dipartimento di Fisica e Geologia, Università degli Studi di Perugia
Francesco Cruciani
Affiliation:
Dipartimento di Fisica e Geologia, Università degli Studi di Perugia formerly at University of Perugia, currently at ENI S.p.A., Via Emilia, 1, 20097 San Donato Milanese, Milan, Italy
Massimiliano Porreca
Affiliation:
Dipartimento di Fisica e Geologia, Università degli Studi di Perugia
Maurizio Ercoli
Affiliation:
Dipartimento di Fisica e Geologia, Università degli Studi di Perugia
Stefan Back
Affiliation:
Geologisches Institut, Rheinisch Westfälische Technische Hochschule, Aachen University, Wüllnerstrasse 252056, Aachen, Germany
Massimiliano R. Barchi
Affiliation:
Dipartimento di Fisica e Geologia, Università degli Studi di Perugia
*
Author for correspondence: Filippo Carboni, Email: filippocarboni@ymail.com

Abstract

The presence of a set of well-known turbidite successions, deposited in progressively E-migrating foredeep basins and subsequently piled up with east vergence, makes the Northern Apennines of Italy paradigmatic of the evolution of deepwater fold-and-thrust belts. This study focuses on the early Apenninic collisional stage, early Miocene in age, which led to the accretion of the turbidites of the Trasimeno Tectonic Wedge (TTW), in the central part of the Northern Apennines. Based on the interpretation of previously unpublished seismic reflection profiles with new surface geology data and tectonic balancing, we present a detailed tectonic reconstruction of the TTW. In the study area, the TTW is characterized by a W-dipping shaly basal décollement located at a depth of 1–5 km. The tectonic wedge is c. 5 km thick at its central-western part and tapers progressively eastwards to c. 1 km. The total shortening, balanced along a 33 km long cross-section, is c. 60 km, including 20 km (40%) of internal imbrication, c. 23 km of horizontal ENE-wards translation along the basal décollement and c. 17 km of passive translation caused by the later shortening of footwall units. Deformation balancing, constrained through upper Aquitanian – upper Burdigalian (c. 21–16 Ma) biostratigraphy, provides an average shortening rate of c. 8.6 mm a–1. Internal shortening of the TTW shows an average shortening rate of c. 4 mm a–1 for this period.

Type
Original Article
Copyright
© Cambridge University Press 2019 

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