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Redefinition of the Ligurian Units at the Alps-Apennines junction (NW Italy) and their role in the evolution of the Ligurian accretionary wedge; constraints from melanges and broken formations

Edoardo Barbero, Andrea Festa, Emilio Saccani, Rita Catanzariti and Roberta D'Onofrio
Redefinition of the Ligurian Units at the Alps-Apennines junction (NW Italy) and their role in the evolution of the Ligurian accretionary wedge; constraints from melanges and broken formations
Journal of the Geological Society of London (July 2019) 177 (3): 562-574

Abstract

We document that the undifferentiated chaotic Ligurian Units of the Monferrato-Torino Hill sector (MO-TH) at the Alps-Apennines junction consist of three different units that are comparable with the Cassio, Caio and Sporno Units of the External Ligurian Units of the Northern Apennines. Their internal stratigraphy reflects the character of units deposited in an ocean-continent transition (OCT) zone between the northwestern termination of the Ligurian-Piedmont oceanic basin and the thinned passive margin of Adria microcontinent. The inherited wedge-shaped architecture of this OCT, which gradually closed toward the north in the present-day Canavese Zone, controlled the Late Cretaceous-early Eocene flysch deposition at the trench of the External Ligurian accretionary wedge during the oblique subduction. This favoured the formation of an accretionary wedge increasing in thickness and elevation toward the SE, from the MO-TH to the Emilia Northern Apennines. Our results therefore provide significant information on both the palaeogeographical reconstruction of the northwestern termination of the Ligurian-Piedmont oceanic basin and the role played by inherited along-strike variations (stratigraphy, structural architecture and morphology) of OCT zones in controlling subduction-accretionary processes. Supplementary material: A spreadsheet with X-ray fluorescence spectrometry and inductively coupled plasma mass spectrometry whole-rock major and trace element composition of mantle peridotites, and photomicrographs of mantle peridotites are available at https://doi.org/10.6084/m9.figshare.c.4519643


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 177
Serial Issue: 3
Title: Redefinition of the Ligurian Units at the Alps-Apennines junction (NW Italy) and their role in the evolution of the Ligurian accretionary wedge; constraints from melanges and broken formations
Affiliation: Universita di Ferrara, Dipartimento di Fisica e Scienze della Terra, Ferrara, Italy
Pages: 562-574
Published: 20190703
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 91
Accession Number: 2019-095123
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diag., strat. cols., geol. sketch maps
N44°45'00" - N45°00'00", E08°45'00" - E09°25'00"
N45°00'00" - N45°10'00", E07°55'00" - E08°30'00"
Secondary Affiliation: Universita di Torino Via Valperga Caluso, Dipartimento di Scienze della Terra, ITA, ItalyIstituto di Geoscienze e Georisorse, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201950
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