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New data on post-Eocene tectonic evolution of the external Ligurian Brianconnais (western Ligurian Alps)

Fabrizio Piana, Alessia Musso, Carlo Bertok, Anna D'Atri, Luca Martire, Elena Perotti, Dario Varrone and Giorgio Martinotti
New data on post-Eocene tectonic evolution of the external Ligurian Brianconnais (western Ligurian Alps) (in Alps and Apennines; a natural laboratory of structural geology and geodynamics; papers presented at the International meeting in honour of Gaetano Giglia and Tonino Decandia, Giovanni Capponi (editor), Michele Marroni (editor), Enrico Tavarnelli (editor) and Fernando Calamita (editor))
Italian Journal of Geosciences (June 2009) 128 (2): 353-366

Abstract

A new structural setting for the central part of the External Ligurian Brianconnais (CELB) is proposed. CELB is divided into km-scale tectonic units that still preserve pre-Alpine geological features at several stratigraphic levels. Macro-, meso- and microscale primary features, such as paleoescarpments, unconformities and depositional or diagenetic fabrics are thus well preserved and can be still mapped and studied in detail at many stratigraphic levels. Significant transposition of bedding is recorded only in Upper Cretaceous and Eocene marly limestones and shales and in major km-long shear zones, where intense development of closely spaced tectonic foliations occurred. Several features indicate that the CELB tectonic evolution took place at shallow crustal levels: 1) strong localization of deformation along the weakest stratigraphic levels; 2) absence of diffuse recrystallization of rocks; 3) minor occurrence or absence of transposition of bedding; 4) kinematic evolution of fold axial plane foliations into frictional slip cleavages. A gradual decrease in the intensity of deformation from the Internal Ligurian Brianconnais to CELB and Dauphinois Domain is observed, although the boundaries of these three domains correspond, in the study area, to several Km-long, transpressive shear zones whose kinematic role in the evolution of the southern termination of the Western Alps should be carefully considered.


ISSN: 2038-1719
Coden: BOGIAT
Serial Title: Italian Journal of Geosciences
Serial Volume: 128
Serial Issue: 2
Title: New data on post-Eocene tectonic evolution of the external Ligurian Brianconnais (western Ligurian Alps)
Title: Alps and Apennines; a natural laboratory of structural geology and geodynamics; papers presented at the International meeting in honour of Gaetano Giglia and Tonino Decandia
Author(s): Piana, FabrizioMusso, AlessiaBertok, CarloD'Atri, AnnaMartire, LucaPerotti, ElenaVarrone, DarioMartinotti, Giorgio
Author(s): Capponi, Giovannieditor
Author(s): Marroni, Micheleeditor
Author(s): Tavarnelli, Enricoeditor
Author(s): Calamita, Fernandoeditor
Affiliation: Universita di Torino, Dipartimento di Scienze della Terra, Turin, Italy
Pages: 353-366
Published: 200906
Text Language: English
Summary Language: Italian
Publisher: Societa Geologica Italiana, Rome, Italy
Meeting name: Alps and Apennines; a natural laboratory of structural geology and geodynamics; International meeting in honour of Gaetano Giglia and Tonino Decandia
Meeting location: Pisa, ITA, Italy
Meeting date: 20071025Oct. 25-26, 2007
References: 29
Accession Number: 2011-009262
Categories: Structural geologyStratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 2 plates, geol. sketch map
N43°45'00" - N44°40'00", E07°45'00" - E10°04'60"
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201106
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