Arguments en faveur de la position, au Jurassique, des ophiolites de Balagne (Haute-Corse, France) au voisinage de la marge continentale européenne

Durand-Delga, Michel; Peybernès, Bernard; Rossi, P.

doi:10.1016/s1251-8050(97)82378-6

Cited by 20 publications

(23 citation statements)

References 4 publications

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“…Balagne Unit, Nebbio Unit, Macinaggio Unit, Bas Ostriconi Unit, Rio Magno Unit, Pineto Unit and Santa Lucia Unit) consist of continental and oceanic units affected by a very low‐grade metamorphism. They are mainly represented by ophiolitic units (Balagne and Nebbio Units) consisting of a Jurassic ophiolite sequence and related Late Jurassic–Late Cretaceous sedimentary cover (Durand‐Delga, ; Durand‐Delga et al ., ; Saccani et al ., ; Padoa et al ., ; Rossi et al ., ; Marroni and Pandolfi, ). The Balagne and Nebbio Units are generally associated with the Macinaggio and Bas‐Ostriconi Units, consisting in turn of Late Cretaceous carbonate turbidites (Sagri et al ., ; Dallan and Nardi, ; Durand‐Delga, ; Pandolfi et al ., ).…”

Section: Geological Frameworkmentioning

confidence: 99%

Syn‐convergence exhumation of continental crust: evidence from structural and metamorphic analysis of the Monte Cecu area, Alpine Corsica (Northern Corsica, France)

et al. 2016

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In the Corsica Island, a stack of metamorphic continental units derived from the European continental margin is thrust over a pre‐Alpine basement during the convergence‐related processes in the Late Eocene–Early Miocene time span. The Piedigriggio‐Prato Unit is representative of these units. Its tectono‐metamorphic history has been reconstructed by an integrated approach, ranging from map‐ to meso‐ and microscopic scale analyses. This unit is characterized by a polyphase deformation history that consists of three deformation phases developed under retrograde metamorphism ranging from blueschist to sub‐greenschist facies metamorphic conditions. At the map‐scale, the Piedigriggio‐Prato Unit is characterized by km‐size isoclinal folds deformed by open to closed recumbent folds producing Type 3 fold interference pattern. The features of the deformations and the P–T conditions suggest that the first two phases were acquired during the ductile extrusion of the Piedigriggio‐Prato Unit. Before the Early Miocene, the gravitational collapse of over‐thickened continental crust produced vertical shortening and the consequently recumbent F3 folds. The exhumation history of the Piedigriggio‐Prato Unit can be viewed as representative for the exhumation of a continental crust fragment during the transition from the continental subduction to the continental collision. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Geological Frameworkmentioning

confidence: 99%

Syn‐convergence exhumation of continental crust: evidence from structural and metamorphic analysis of the Monte Cecu area, Alpine Corsica (Northern Corsica, France)

et al. 2016

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“…This formation grades upward to the Lydienne Flysch of late Cenomanian age (thin‐bedded, mixed turbidites with vertical and lateral stratigraphic relationships with the Toccone Breccia and the Novella Sandstone; Nardi et al ., ). The geochemical features of the Balagne Nappe basalts are typical of crust developed in the first stages of the oceanic spreading (Gruppo Lavoro Ofioliti Mediterranee, ; Durand‐Delga et al ., ; Saccani et al ., ), while terrigenous debris (quartz, minor feldspar fragments, zircons) intercalated in the pillow basalts and sourced from Hercynian Corsica (Rossi & Durand‐Delga, ) lends support to a paleotectonic position of the Balagne Nappe close to the Corsica‐Europe continental margin (Marroni & Pandolfi, ; Fig. a).…”

Section: The Ligurian‐piedmont Ocean and Its Coversmentioning

confidence: 97%

A snapshot of the Late Jurassic Western Tethys seafloor composition and morphology provided by the geochemistry of pelitic sediments (Corsica, Central Alps and Northern Apennines)

2013

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The chemical composition of fine-grained siliciclastic sediments is a powerful tool in provenance studies, either as a complement to other whole rock/single grain methods, or as a stand-alone method when other techniques are not applicable, and particularly in those cases where the coarser sediment fractions are not available or the regional-scale geologic framework is lost due major successive tectonic events. A comprehensive geochemical investigation of pelites from the post-rift deposits of the Ligurian-Piedmont ocean (sampled in tectonic units of the Alpine-Apennine orogen: Balagne Nappe, Corsica; Tuscan Nappe and Internal Ligurian units, Northern Apennines; Err-Platta units, Central Alps) has identified for the first time a major mafic-ultramafic input immediately following rifting. Key trace element ratios (e.g., LaN/YbN < 10; avg. Eu/Eu* = 0.73 ± 0.06, 1SD; Th/(Cr + Ni +V) < 0.03) show that the pelitic siliciclastic layers intercalated in the Radiolarite formation (the first post-rift deposits) are systematically enriched in a mafic-ultramafic source component as compared to the younger post rift sediments (Calpionella Limestone and Palombini Shale). Such a peculiar chemical fingerprint is interpreted as the result of erosion and distribution across the whole basin (even to continental domains) of intraoceanic ophiolitic debris by turbidity and bottom currents sweeping the sea floor at the time of deposition of the Radiolarite Formation. Exhumed mantle and gabbroic-basaltic rocks exposed at the morphologically articulated seafloor of the slow-spreading Ligurian-Piedmont ocean were available to erosion during the whole time-span of the deposition of the Radiolarite formation, whilst they became progressivey subordinate as a source as the basin floor was progressively covered by the siliciclastic input from the developing passive continental margins

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“…It is composed of shallow-water limestones (often oolitic), which locally contain black silicified layers and benthic Foraminifera of Kimmeridgian age [Peybernès in Guérin, 1984;Peybernès et al, 2001]. Further up the sequence, the San Colombano Limestone is overlain (with a stratigraphic contact) by a 10 m thick sequence of massive calcarenite-breccias, rich in blocks and debris of rocks from the Hercynian basement (Permian volcanics, granites and metamorphic rocks; Durand-Delga et al [1997]). They contain the same Kimmeridgian microfauna, which was probably re-deposited.…”

Section: Geological and Stratigraphic Frameworkmentioning

confidence: 99%

“…5 metres of siliceous shales and cherts, in which Lamellaptychus gr. beyrichi, a species indicative of a Kimmeridgian to early Berriasian age, is reported [Durand-Delga et al, 1978]. Reddish at their lower part, they become greenish and more shaly towards the top (2).…”

Section: Geological and Stratigraphic Frameworkmentioning

confidence: 99%

Revised radiolarian ages for the sedimentary cover of the Balagne ophiolite (Corsica, France). Implications for the palaeoenvironmental evolution of the Balano-Ligurian margin

Danelian

Wever²,

Durand-Delga³

2008

Bulletin De La Société Géologique De France

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The age of radiolarites covering the Balagne ophiolite is reassessed based on new and revised radiolarian fossil evidence. The oldest radiolarian cherts are dated as upper Bathonian-lower Callovian in two tectonic units: San Colombano and Novella. These are amongst the oldest ages available so far from ophiolites of the Ligurian ocean. An important stratigraphic gap, spanning the Callovian-early Kimmeridgian interval, is specified between radiolarites and the overlying (and locally gullying) San Colombano shallow-water limestones (sub-unit I). We can now specify that radiolarian ooze accumulated until the late Kimmeridgian in the distal parts of the Balagne margin (sub-unit SC III and Novella unit), while fragments of Hercynian basement fell into the Balagne basin during the late Kimmeridgian-Tithonian.

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Arguments en faveur de la position, au Jurassique, des ophiolites de Balagne (Haute-Corse, France) au voisinage de la marge continentale européenne

Cited by 20 publications

References 4 publications

Syn‐convergence exhumation of continental crust: evidence from structural and metamorphic analysis of the Monte Cecu area, Alpine Corsica (Northern Corsica, France)

Syn‐convergence exhumation of continental crust: evidence from structural and metamorphic analysis of the Monte Cecu area, Alpine Corsica (Northern Corsica, France)

A snapshot of the Late Jurassic Western Tethys seafloor composition and morphology provided by the geochemistry of pelitic sediments (Corsica, Central Alps and Northern Apennines)

Revised radiolarian ages for the sedimentary cover of the Balagne ophiolite (Corsica, France). Implications for the palaeoenvironmental evolution of the Balano-Ligurian margin

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