http://www.cnr.it/ontology/cnr/individuo/prodotto/ID278991

Late Miocene shortening of the Northern Apennines back-arc (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Late Miocene shortening of the Northern Apennines back-arc (Articolo in rivista) (literal)

Anno

2014-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.jog.2013.11.002 (literal)

Alternative label

Bonini M.[1], Sani F.[2], Stucchi E.M.[3], Moratti G.[1], Benvenuti M.[2], Menanno G.[3], Tanini C.[4] (2014)
Late Miocene shortening of the Northern Apennines back-arc
in Journal of geodynamics
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Bonini M.[1], Sani F.[2], Stucchi E.M.[3], Moratti G.[1], Benvenuti M.[2], Menanno G.[3], Tanini C.[4] (literal)

Pagina inizio

1 (literal)

Pagina fine

31 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://dx.doi.org/10.1016/j.jog.2013.11.002 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

74 (literal)

Rivista

Journal of geodynamics (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

31 (literal)

Note

Scopu (literal)
Google Scholar (literal)
ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

[1] Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, UOS Firenze, Via G. La Pira 4, I-50121 Firenze, Italy; [2] Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira 4, I-50121 Firenze, Italy; [3] Dipartimento di Scienze della Terra 'Ardito Desio', Università degli Studi di Milano, Via Mangiagalli 34, I-20133 Milano, Italy; [4] Comune di Firenze, Direzione Ambiente, Via B. Fortini 37, I-50125 Firenze, Italy (literal)

Titolo

Late Miocene shortening of the Northern Apennines back-arc (literal)

Abstract

The inner Northern Apennines (western Tuscany and Tyrrhenian basin) is characterized by a relatively thin continental crust (~20-25 km), high heat flow (>100 mW m-2), and the presence of relevant tectonic elision of stratigraphic sequences, a setting known as Serie Ridotta. These features are normally ascribed to an extensional deformation that affected the back-arc area above the subducting Adria plate since the Early-Middle Miocene (~16 Ma). However, various geophysical studies image the continental crust to becurrently affected by W-dipping thrust faults (and associated basement uplifts) that have not been obliterated by this claimed long-lasting extensional process. These observations raise the question whether the thrusts are older or younger than the continental extension. To address this question we have reprocessed and interpreted the deep seismic reflection profile CROP03/c that crosses the onshore hinterlandsector, and investigated the structural setting of some of the Late Miocene-Pliocene hinterland basins(Cinigiano-Baccinello, Siena-Radicofani, Tafone, Albegna and Radicondoli basins) that are situated at the front or in-between the basement uplifts. The analysis of field structures and commercial seismic profiles has allowed the recognition that both substratum and basins' infill have been intensely shortened.These findings and the architecture of the basins suggest that the latter developed under a contractional regime, which would have started around 8.5 Ma with the onset of the continental sedimentation. This compressive stress state followed an earlier phase of continental extension that presumably started at ~16 Ma (with the blocking of the Corsica-Sardinia rotation), and thinned both the continental crust and sedimentary cover producing most of the Serie Ridotta. The main phases of basin shortening are bracketed between 7.5 and 3.5 Ma, and thus overlap with the increase in the exhumation rate of the metamorphic cores at ~6-4 Ma determined through thermochronological data. We therefore propose a correlation between the basin deformation and the activity of the nearby basement thrusts, which would have thus shortened a previously thinned continental crust. This chronology of deformation may suggest a geodynamic model in which the back-arc and hinterland sector of the Northern Apennines was recompressed during Late Miocene-Early Pliocene times. This evolution may be explained through different speculative scenarios involving a blockage of the subduction process, which may vary between end members ofcomplete slab detachment and stalled subduction. (literal)

Prodotto di