Position structurale et role paleogeographique de l'unite du Bracco au sein du contexte ophiolitique liguro-piemontais (Apennin-Italie)

Grandjacquet, C.; Haccard, D.

doi:10.2113/gssgfbull.s7-xix.4.901

Cited by 21 publications

(5 citation statements)

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“…This reconstruction implied a reversal of the subduction during late Eocene time. Reconstructions with a subduction reversal have also been proposed subsequently by Haccard et al (1972), Elter and Pertusati (1973), Grandjacquet and Haccard (1977), and Boccaletti et al (1980), mainly differing in the age and the location of the 'alpine' and 'apennine' subductions.…”

Section: Historical Picture Of the Studies On The Ligurian Units Durimentioning

confidence: 76%

Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy

Marroni

Meneghini

Pandolfi

2010

International Geology Review

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In the Northern Apennines, in contrast to the Western Alps and Alpine Corsica, upper structural levels of the Late Cretaceous-middle Eocene subduction complex are still preserved and well exposed. This subduction complex developed in the LigurePiemontese basin since the Late Cretaceous time as a consequence of convergence between the Eurasia and Adria plates. Representative successions of this ancient subduction complex are well preserved in the Ligurian units of the Northern Apennines, where turbidite and mass-gravity deposits showing pristine stratigraphic features are present. Three main domains, represented by different groups of tectonic units, can be identified, each delineating a different domain of the subduction zone. In this article, we first present a brief history of geological research in the Northern Apennines during the last half of the twentieth century and then a comprehensive picture of the stratigraphy and tectonics of the Ligurian units. A new interpretation of the related tectonostratigraphic units is proposed within the conceptual modern geodynamic framework of convergent margins.

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Section: Historical Picture Of the Studies On The Ligurian Units Durimentioning

confidence: 76%

Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy

Marroni

Meneghini

Pandolfi

2010

International Geology Review

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“…Differently, other authors (e.g. Grandjacquet and Haccard, [60]; Bertoni et al, [58] ; Van Warne!, [61]) following previous suggestions [26,62] tend to relate the Late Cretaceous melanges to the inception or to the ongoing of an east-dipping (or alpine) subduction zone.…”

Section: Significance Of the Late Cretaceous Tectonic• Related Sedimementioning

confidence: 76%

“…The absence of coarsening upward sequences is evident even if only the Upper Campanian sedimentary melanges are considered; the coarse grained deposits associated with slide blocks can be observed in the lowermost stratigraphic position of the sequence and grades upward to fine grained ophiolitic sandstone (e.g. Elter et al [35]); -the Helminthoid flysch sequences are overlain by Paleocene up to Middle Eocene carbonate deposits; if related to a west-dipping subduction zone this implies a residence time of more than 40 Ma in a trench envirnoment, without any evidence of deformation; -the deformational history of the EL units bears evidence of a polyphasic tectonic evolution, started since the Paleocene and characterized by an early top-to-west tectonic transport and nappe emplacement [26,60], followed by extensional deformation and gravitational sliding, with an inversion of tectonic transport and the development of large scale NE-facing isoclinal folding at high structural levels.…”

Section: Significance Of the Late Cretaceous Tectonic• Related Sedimementioning

confidence: 99%

Tectono-sedimentary evolution of the External Liguride units (Northern Apennines, Italy): insights in the pre-collisional history of a fossil ocean-continent transition zone

et al. 2001

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In the Northern Apennines, the External Liguride (EL) Units are interpreted as derived from the domain that joined the Ligure-Piemontese oceanic basin to the Adriatic plate continental margin. The EL units can be divided into two different groups according to the lithostratigraphic features of the basal complexes Underlying the Upper Cretaceous-Lower Tertiary carbonate flysch (e.g. Helminthoid flysch). The first group includes the western successions characterized by Santonian-Campanian sedimentary melanges where slide blocks oflherzolitic mantle, gabbros, basalts, ~anulites, continental granitoids are represented. The second group IS represented by the eastern successions where the Cenomanian-Campanian basal complexes mainly consist of sandstones and conglomerates where the mafic and ultramafic rocks are scarce or completely lacking. Their original substrate is represented by the Middle Triassic to Lower Cretaceous, mainly platform carbonate deposits, found as slices at the base of the eastern successions. The stratigraphic features shown by the basal complexes allow the reconstruction of their source area that is assumed to be also representative for the pre-Upper Cretaceous setting. The proposed reconstruction suggests the occurrence in the EL domain of two distinct domains. The eastern domain was characterized by a thinned and faulted continental crust belonging to the Adriatic continental margin. The western domain was instead floored by subcontinental mantle associated with lower and upper continental crust, representing the ocean-continent transition. This setting is interpreted as the result of the opening of the Ligure-Piemontese oceanic basin by passive rifting, mainly developed by si~ple shear, asymmetric extension of the continental crust. © 200 I Editions scientifiques et medicales Elsevier SAS rifting I extension I ocean-continent transition I External Liguride units I Northern Apennines * Correspondence and reprints.

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“…The Ligurian Alps are considered as the southeastern end of the western Alps and represents the connection between Alps and Apennines [Haccard et al, 1972;Grandjacquet and Haccard, 1977;Vanossi et al, 1984]. A siginificant number of litho-tectonic units have been indentified ( fig.…”

Section: General Remarksmentioning

confidence: 99%

Deciphering orogeny: a metamorphic perspective. Examples from European Alpine and Variscan belts

Lardeaux

2014

Bulletin De La Société Géologique De France

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In this paper we review and discuss, in a synthetic historical way, the main results obtained on Alpine metamorphism in the western Alps. First, we describe the finite metamorphic architecture of the western Alps and discuss its relationships with subduction and collision processes. Second, we portray the progressive metamorphic evolution through time and space with the presentation of 5 metamorphic maps corresponding to critical orogenic periods, namely 85-65 Ma, 60-50 Ma, 48-40 Ma, 38-33 Ma and 30-20 Ma. We underline the lack of temporal data on high-pressure/low-temperature metamorphic rocks as well as the severe uncertainties on the sizes of rock units that have recorded the same metamorphic history (i.e. coherent P-T-t/deformation trajectories). We discuss the role of subduction-driven metamorphism in ocean-derived protoliths and the conflicting models that account for the diachrony of continental subductions in the western Alps. Comprendre l'orgenèse : une perspective métamorphique. Exemples dans les chaînes Alpine et Varisque européennes Première partie : Le métamorphisme alpin des Alpes occidentales. Une revue Mots-clés. -Alpes occidentales, Métamorphisme alpin, Revue, Orogenèse, Géodynamique alpine.Résumé. -Cet article présente une revue et une discussion, avec une vision historique, des principaux résultats obtenus sur l'évolution métamorphique des Alpes occidentales. Dans un premier temps nous décrivons l'architecture métamor-phique finie des Alpes occidentales et son interprétation en termes de processus de subduction et de collision. Dans un deuxième temps, nous illustrons l'évolution métamorphique dans le temps et l'espace par la présentation de 5 cartes mé-tamorphiques temporelles correspondant à des périodes critiques de l'orogenèse, et plus particulièrement Ma. Nous soulignons le cruel manque de données temporelles sur le métamor-phisme de haute-pression et basse-température ainsi que les sévères incertitudes qui existent sur les dimensions des unités qui ont subi des histoires métamorphiques similaires (trajectoires P-T-t/déformation cohérentes). Nous discutons le rôle de la subduction comme moteur du métamorphisme des roches d'origine océanique ainsi que les contradictions qui existent entre les modèles qui rendent compte du caractère diachronique des subductions continentales dans les Alpes occidentales.

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Position structurale et role paleogeographique de l'unite du Bracco au sein du contexte ophiolitique liguro-piemontais (Apennin-Italie)

Cited by 21 publications

References 0 publications

Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy

Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy

Tectono-sedimentary evolution of the External Liguride units (Northern Apennines, Italy): insights in the pre-collisional history of a fossil ocean-continent transition zone

Deciphering orogeny: a metamorphic perspective. Examples from European Alpine and Variscan belts

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