Compressive “Alpine” tectonics in Western Sardinia (Italy): geodynamic consequences

Barca, S.; Costamagna, Luca Giacomo

doi:10.1016/s1251-8050(97)82758-9

Cited by 14 publications

(22 citation statements)

References 6 publications

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“…This shows a southward closure of the Pyrenean ocean on a Provençal transect, whereas a northward subduction took place on a Pyrenean transect (Vergés and Garcia-Senz, 2001), also recorded in Sardinia (Barca and Costamagna, 1997;Barca and Costamagna, 2000), but again a southward subduction took place westward in the Biscay ocean.…”

Section: The "Valais Ocean" Question and The Alps Pyrenees Connectionmentioning

confidence: 80%

Western Alps geological constraints on western Tethyan reconstructions

et al. 2002

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Section: The "Valais Ocean" Question and The Alps Pyrenees Connectionmentioning

confidence: 80%

Western Alps geological constraints on western Tethyan reconstructions

et al. 2002

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“…An Eocene NW‐SE shortening has been identified using striated microfaults, extensional veins, and stylolites [ Letouzey et al , 1982], mainly in the western part of the island. Trémolières et al [1984] and then Barca and Costamagna [1997] provide additional structural evidence of middle Eocene folding and thrusting, leading to the recognition of a Pyrenean front along the present‐day northwestern coast of Sardinia. These Sardinian structures can be considered as marking the eastern extension of the outermost part of the south Pyrenean zone.…”

Section: Available Structural/kinematic Models Do Not Account For Geomentioning

confidence: 99%

Structural and kinematic relationships between Corsica and the Pyrenees‐Provence domain at the time of the Pyrenean orogeny

2005

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The Pyrenees‐Provence belt and the Alps were both active in the late Eocene. Alpine Corsica was once a part of the Alps, and the now obducted metamorphic oceanic domain is similar and easily correlated in both areas. Tectonic reconstructions before the Oligo‐Miocene opening of the Liguro‐Provençal basin show that at the same time, Corsica was located in the hinterland of the Provençal ranges. A late Eocene cross section running from Alpine Corsica to Provence gives an image of a complete mountain belt from an internal domain made of metamorphosed oceanic material (Alpine Corsica) to the foreland fold and thrust with a thin‐skinned geometry (Provence). During the late Eocene the intervening basement of western Corsica was thus within this mountain belt, probably thrust onto the European basement. We analyze and interpret the structural pattern and the overall geometry of the Provençal‐Corsican domain during late Eocene times in terms of oblique convergence and strain partitioning, within the framework of the Africa‐Eurasia convergence. This evolution is integrated in a set of kinematic reconstructions of the western Mediterranean region from 65 Ma to the present.

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“…These formations form the Produttivo Group (Figure ; Fadda et al, , and references therein). Then, during middle Eocene times, Sardinia was affected by the external deformations of the Pyrenean orogeny (Barca & Costamagna, , ). The erosion of this chain feeds continental deposits that form the Cixerri Formation, which is middle Eocene (early Lutetian: Agus & Pecorini, ; Pittau Demelia, ) to early Oligocene in age (Barca & Costamagna, , ; Maxia, ).…”

Section: Geological Framework Of Southern Sardinia and Previous Knowlmentioning

confidence: 99%

“…The Cixerri Formation in Southern Sardinia is the molasse system of the southern slopes of the Eastern Pyrenaic chain (Barca & Costamagna, , ; Cherchi, ). The Sardinia–Corsica block formed part of the Eastern Iberia microplate before the opening of the Algero–Provencal basin, and its western borders were partially involved in the Pyrenean tectonics (Barca & Costamagna, ).…”

Section: Palaeogeography and Comparison With Similar Coeval Sardinianmentioning

confidence: 99%

“…The formation may reach a maximum thickness of 350–400 m, and it was deposited in continental to possibly transitional environments (Barca & Costamagna, ; Barca & Palmerini, ). The formation represents the molassic post‐Pyrenean phase of sedimentation in Sardinia (Barca & Costamagna, , ; Cherchi, ), and crops out in the south of the island, where it sometimes rests conformably to unconformably over the Lignitifero Formation, which is a lower Eocene carbonate–siliciclastic lignite‐bearing succession (Barca & Costamagna, , ; Cocozza, De Candia, & Gandin, ; Dreesen et al, ; Fadda, Ottelli, & Perna, ; Fanni, Murru, Salvadori, & Sarria, ; Murru & Salvadori, ; Figure , left). Elsewhere, the Cixerri Formation rests unconformably on low‐grade Variscan metamorphic basement (Carmignani et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Evolution of a Pyrenean molassic basin in the Western Mediterranean area: The Eocene–Oligocene Cixerri Formation in Southern Sardinia (Italy)

Costamagna

Schäfer

2017

Geological Journal

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Funding information MiURThe sedimentary features of the Cixerri Formation (Eocene-Oligocene) and its evolution in space and time are described through mapping, investigation of all the significant outcrops, and also by analysing the depositional architecture of well-exposed and laterally extensive outcrops. The Cixerri Formation marks the middle Eocene Pyrenean unconformity and blankets a former structural ridge-and-swale morphology. This started by covering the flanks of the ridges with small alluvial fans and ultimately filled the swales with fluvial deposits in braided to meandering stream environments. In this latter sedimentation phase, the depositional environment of the formation evolved both upwards, and from west to east, to gradually lower energy environments, suggesting a transgressive-type evolution. The Eocene-Oligocene Cixerri Formation was deposited by a fluvial network with a regular flow regime under a humid-warm climate: This network was formed by a main W-E-directed trunk and a NW-SE-directed minor branch that ultimately joined together. The Cixerri Formation, which was fed by the erosion of a sector of the Pyrenean Chain, passes upwards to coarser deposits that indicate the transition from a quiet tectonic environment to an active transtensional tectonic phase (Apennine phase). A comparison with similar coeval formations in Northern Sardinia, Corsica, and the Western Mediterranean area (Balearic Islands, France) is attempted, before the significance of the formation in the Pyrenean orogeny is then discussed.

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Compressive “Alpine” tectonics in Western Sardinia (Italy): geodynamic consequences

Cited by 14 publications

References 6 publications

Western Alps geological constraints on western Tethyan reconstructions

Western Alps geological constraints on western Tethyan reconstructions

Structural and kinematic relationships between Corsica and the Pyrenees‐Provence domain at the time of the Pyrenean orogeny

Evolution of a Pyrenean molassic basin in the Western Mediterranean area: The Eocene–Oligocene Cixerri Formation in Southern Sardinia (Italy)

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