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GEOREF RECORD

Role of Late Jurassic intra-oceanic structural inheritance in the Alpine tectonic evolution of the Monviso meta-ophiolite complex (Western Alps)

Gianni Balestro, Andrea Festa, Alessandro Borghi, Daniele Castelli, Marco Gattiglio and Paola Tartarotti
Role of Late Jurassic intra-oceanic structural inheritance in the Alpine tectonic evolution of the Monviso meta-ophiolite complex (Western Alps) (in Birth and death of oceanic basins; geodynamic processes from rifting to continental collision in Mediterranean and circum-Mediterranean orogens, G. Capponi (editor), Andrea Festa (editor) and Gisella Rebay (editor))
Geological Magazine (February 2018) 155 (2): 233-249

Abstract

The eclogite-facies Monviso meta-ophiolite Complex in the Western Alps represents a well-preserved fragment of oceanic lithosphere and related Upper Jurassic - Lower Cretaceous sedimentary covers. This meta-ophiolite sequence records the evolution of an oceanic core complex formed by mantle exhumation along an intra-oceanic detachment fault (the Baracun Shear Zone), related to the opening of the Ligurian-Piedmont oceanic basin (Alpine Tethys). On the basis of detailed geological mapping, and structural, stratigraphic and petrological observations, we propose a new interpretation for the tectonostratigraphic architecture of the Monviso meta-ophiolite Complex, and discuss the role played by structural inheritance in its formation. We document that subduction- and exhumation-related Alpine tectonics were strongly influenced by the inherited Jurassic intra-oceanic tectonosedimentary physiography. The latter, although strongly deformed during a major Alpine stage of non-cylindrical W-verging folding and faulting along exhumation-related Alpine shear zones (i.e. the Granero-Casteldelfino and Villanova-Armoine shear zones), was not completely dismembered into different tectonic units or subduction-related melanges as suggested in previous interpretations. The present-day architecture of the Monviso meta-ophiolite Complex results from nappe-scale folding with a significant component of shearing, and strain partitioning of the Alpine deformation, which were controlled by the inherited occurrence of (i) lateral and vertical variations of facies and thickness of sediments, (ii) an intra-oceanic fault-rock assemblage, which acted as weak horizons in concentrating deformation, and (iii) remnants of a volcanic ridge, which consists of massive metabasalt. Thus, the recognition of pre-collisional, intra-oceanic, tectonostratigraphic inheritance represents an important step in reconstructing the tectonic evolution of meta-ophiolite units in orogenic belts.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 155
Serial Issue: 2
Title: Role of Late Jurassic intra-oceanic structural inheritance in the Alpine tectonic evolution of the Monviso meta-ophiolite complex (Western Alps)
Title: Birth and death of oceanic basins; geodynamic processes from rifting to continental collision in Mediterranean and circum-Mediterranean orogens
Author(s): Balestro, GianniFesta, AndreaBorghi, AlessandroCastelli, DanieleGattiglio, MarcoTartarotti, Paola
Author(s): Capponi, G.editor
Author(s): Festa, Andreaeditor
Author(s): Rebay, Gisellaeditor
Affiliation: Universita di Torino, Dipartimento di Scienze della Terra, Turin, Italy
Affiliation: University of Genova, Department of Earth, Environment and Life Sciences, Genova, Italy
Pages: 233-249
Published: 201802
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 80
Accession Number: 2018-053013
Categories: Structural geologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N44°34'60" - N44°49'60", E06°55'00" - E07°00'00"
Secondary Affiliation: Universita di Milano, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
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