Kilometre-scale paleoescarpments as evidence for Cretaceous synsedimentary tectonics in the External Briançonnais Domain (Ligurian Alps, Italy) (Articolo in rivista)

Type
Label
  • Kilometre-scale paleoescarpments as evidence for Cretaceous synsedimentary tectonics in the External Briançonnais Domain (Ligurian Alps, Italy) (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.sedgeo.2012.01.012 (literal)
Alternative label
  • BERTOK C. (1), MARTIRE L. (1), PEROTTI E. (1), D'ATRI A. (1), PIANA F. (2) (2012)
    Kilometre-scale paleoescarpments as evidence for Cretaceous synsedimentary tectonics in the External Briançonnais Domain (Ligurian Alps, Italy)
    in Sedimentary Geology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • BERTOK C. (1), MARTIRE L. (1), PEROTTI E. (1), D'ATRI A. (1), PIANA F. (2) (literal)
Pagina inizio
  • 58 (literal)
Pagina fine
  • 75 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://dx.doi.org/10.1016/j.sedgeo.20 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 251-252 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 19 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1: Dipartimento di Scienze della Terra, Università di Torino; 2: CNR IGG, unità di Torino (literal)
Titolo
  • Kilometre-scale paleoescarpments as evidence for Cretaceous synsedimentary tectonics in the External Briançonnais Domain (Ligurian Alps, Italy) (literal)
Abstract
  • In the central part of the External Ligurian Briançonnais in the Ligurian Alps (NW Italy), a large and diverse set of stratigraphic, sedimentologic and petrographic data provides evidence for the occurrence of Cretaceous kilometre-scale palaeoescarpments. These palaeoescarpments consist of irregular erosional surfaces more or less deeply incising a stratigraphic succession that ranges from Upper Jurassic limestones down to Permian volcano-sedimentary rocks; at present they are partly exposed and partly covered by Upper Cretaceous- Upper Eocene sediments, and patchily encrusted by authigenic minerals. Palaeoescarpments resulted from the remodelling of palaeofault planes by gravity-driven rock fall processes, whose products are represented by breccias and metre- to tens of metres-sized blocks of Upper Jurassic limestones either lying directly over the surfaces or embedded within onlapping sediments. Palaeofault-related tensional stresses are also docu- mented by the occurrence of subvertical sedimentary neptunian dykes and tabular breccia bodies, inter- preted as fault rocks and locally bearing evidence of the uprise of hot, overpressured fluids. Fault activity started during the Aptian, with most of the displacement--which locally reached several hundred metres-- accomplished during the Late Cretaceous, resulting in deep morpho-structural depressions that, by Eocene times, were not yet levelled out. Two systems of kilometre-long palaeoescarpments are recognized and mapped, suggesting the existence of a Cretaceous kilometre-sized fault-bounded basin limited to the north and south by two main transcurrent zones, presently striking E-W and internally partitioned by N-S oriented east-dipping normal faults. This type of setting could be consistent with the Western Tethys tectonic context, in which the Ligurian Briançonnais Domain, close to the Early-Late Cretaceous boundary, was located at the easternmost end of a transcurrent belt connecting the Bay of Biscay to the Valais and Ligurian-Piedmont oceans. (literal)
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