Mesoscale structural analysis of the Ligurian broken formations of the Northern Apennines and the regional occurrence of subduction-related structures indicate polyphase folding as the mechanism responsible for progressive disruption. The evidence for direct correlation between regionally extensive noncylindrical folds and tectonic disruption has a strong bearing on determining how the Ligurian accretionary prism evolved. For example, the block-in-matrix structure of the Ligurian tectonic melanges is produced through extension developed along fold limbs in a compressive stress field, as expected from offscraping and intraprism deformation. The model implied by the mesoscale and macroscale analyses of the Ligurian tectonic melanges provides one mechanism of accretion reconciling two deformation styles, i.e., stratal disruption and folding, commonly seen in ancient accretionary prisms. Furthermore, this model could be relevant in active accretionary prisms, especially in the intraprism part, where the seismic and drilling data are sparse.

Mechanisms of subduction accretion as implied from the broken formations in the Apennines, Italy / P., Vannucchi; Bettelli, Giuseppe. - In: GEOLOGY. - ISSN 0091-7613. - 30:(2002), pp. 835-838.

Mechanisms of subduction accretion as implied from the broken formations in the Apennines, Italy

BETTELLI, Giuseppe
2002

Abstract

Mesoscale structural analysis of the Ligurian broken formations of the Northern Apennines and the regional occurrence of subduction-related structures indicate polyphase folding as the mechanism responsible for progressive disruption. The evidence for direct correlation between regionally extensive noncylindrical folds and tectonic disruption has a strong bearing on determining how the Ligurian accretionary prism evolved. For example, the block-in-matrix structure of the Ligurian tectonic melanges is produced through extension developed along fold limbs in a compressive stress field, as expected from offscraping and intraprism deformation. The model implied by the mesoscale and macroscale analyses of the Ligurian tectonic melanges provides one mechanism of accretion reconciling two deformation styles, i.e., stratal disruption and folding, commonly seen in ancient accretionary prisms. Furthermore, this model could be relevant in active accretionary prisms, especially in the intraprism part, where the seismic and drilling data are sparse.
30
835
838
Mechanisms of subduction accretion as implied from the broken formations in the Apennines, Italy / P., Vannucchi; Bettelli, Giuseppe. - In: GEOLOGY. - ISSN 0091-7613. - 30:(2002), pp. 835-838.
P., Vannucchi; Bettelli, Giuseppe
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/305024
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 47
  • ???jsp.display-item.citation.isi??? 42
social impact