The hercynian chain in Sardinia (Italy)

Carmignani, L.; Carosi, Rodolfo; Pisa, A. Di; Gattiglio, Marco; Musumeci, Giovanni; Oggiano, G.; Pertusati, P. C.

doi:10.1080/09853111.1994.11105257

Cited by 194 publications

(245 citation statements)

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“…The E Sardinia Variscan basement consists of several superposed tectonic units (Carmignani et al, 1994;2001) with a metamorphic grade that grows from S to N from the greenschists facies to the amphibolite facies. According to the most recent findings (Funedda, pers.…”

Section: Geological Settingmentioning

confidence: 99%

“…This cover tectonically undisturbed rests over an unconformity that is Bajocian in age and forms the base of the Middle Jurassic succession (Dieni et al, 1983). This unconformity, named the "Alpine Tethyan unconformity" herein, tops Variscan Cambrian to Early Carboniferous metamorphic rocks (Carmignani et al, 1994(Carmignani et al, , 2001, and less commonly Triassic (Costamagna and Barca, 2002) and Permian (Cassinis and Ronchi, 2002) sedimentary deposits. The age and causes of this unconformity is coeval to the Jurassic opening of the Alpine Tethys in the W Mediterranean area (Abbate et al, 1986;Bernoulli and Jenkyns, 1974;Stampfli, 2000) an thus can be considered related to it.…”

Section: Introductionmentioning

confidence: 97%

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The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Costamagna

2016

Journal of Iberian Geology

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Investigations performed along the Middle Jurassic Alpine Tethyan unconformity surface of E Sardinia evidenced an elaborate surface that developed over older Late Paleozoic to Triassic rocks. This surface is covered by the Middle Jurassic Genna Selole Fm, which has different sedimentological and petrographical characteristics and thicknesses according to its location and the morphology and evolution of the lower substrate.An analysis of the unconformity and the rocks located above and below it revealed that a tectonic high emerged early during the Middle Jurassic from E Sardinia to Corsica in response to the extensional tectonics leading to the Alpine Tethys opening. This high was almost immediately fragmented in secondary blocks, and an irregular morphology of minor lows and highs thus formed upon it. The high was, on the whole, subjected to strong erosion. Its deposits accumulated along the rims of the high and in the lows of its surface, smoothing the landscape and preparing it for the marine transgression that followed. The tectonic high rapidly collapsed starting from its North side as show the older age of the marine deposits first investigated.A similar rise-and-collapse tectosedimentary evolution can be seen in some of the W Mediterranean domains next to the Sardinia-Corsica block. Indeed, they are all related to the Alpine Tethys opening and may mark a discontinuous high separating the Paleoeuropa from the Tethyan domain. Consequently, a comparison with all of these domains has been attempted by trying to set the Sardinia-Corsica block in this extensional margin scenario.Keywords: Alpine Tethys, Unconformity, Jurassic, Paleogeography, Sedimentology, Eastern Sardinia-Corsica Tectonic high ResumenInvestigaciones llevadas a cabo en la superficie discordante del Jurásico Medio del Tetis alpino evidencia que esta superficie está muy elaborada y se desarrolló sobre rocas que abarcan desde un registro Paleozoico Superior a Triásico. Esta superficie está cubierta por la Fm Genna Selole, de edad Jurásico Medio, que tiene diferentes características sedimentológicas y petrológicas y una potencia que depende de su localización y la morfología y evolución del substrato inferior.Un análisis de esta discordancia y de las rocas localizadas por encima y debajo de la misma revela que hubo un importante alto tectónico in etapas iniciales del Jurásico Medio que afectaba desde el E de Cerdeña a Córcega en respuesta a una tectónica extensional relacionada con la apertura del Tetis alpino. Esta área elevada fue rápidamente fragmentada en bloques desarrollándose una morfología de zonas altas y deprimidas previa a la transgresión marina que llegó seguidamente. Por los datos que muestran los primeros registros marinos se puede deducir que la fragmentación del citado alto tectónico se inició por su parte norte. Una evolución similar en zonas altas y bajas puede observarse igualmente en otras zonas del Mediterráneo occidental próximas al bloque de Córcega-Cerdeña. De hecho, todas ellas están relacionadas con la apertura de...

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Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Costamagna

2016

Journal of Iberian Geology

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“…Therefore, in the absence of high-resolution geochronologic constraints, faulting is inferred to be Late-Carboniferous to Early Permian and possibly related to the large clockwise rotation of the Corsica-Sardinia block in late Variscan times (Edel, Casini, Oggiano, Rossi, & Schulmann, 2014). The faults characterized by sinistral kinematic and NE to ENE direction entangle the Mesozoic-Cenozoic sedimentary and volcanic sequences, generating either positive flower structures or strike-slip basins corresponding to restraining or releasing bends respectively (Carmignani et al, 1994). The age of syntectonic sediments indicates that most of these late Variscan faults were reactivated in Oligocene to Miocene times (Carmignani et al, 1995), during the collision between the Corsica-Sardinia block and Adria (Carmignani, Funedda, Oggiano, & Pasci, 2004;Oggiano, Funedda, Carmignani, & Pasci, 2009).…”

Section: Post-variscan Brittle Tectonicsmentioning

confidence: 99%

“…The final convergence between the continental blocks was characterized by the development of a wide network of lithospheric strike-slip shear zones, which accommodated the northeastward displacement of Laurussia and Avalonia relative to stable Gondwana from late Visean to Early Permian (Faure, Lardeaux, & Ledru, 2009;Gutiérrez-Alonso et al, 2008;Muttoni, Kent, & Channell, 1996). The pre-Mesozoic basement of north Sardinia is a section of the Variscan orogen equivalent to the Moldanubian domain ( Figure 1) of central Europe (Edel et al, 2013;Matte, 2001;Rossi, Oggiano, & Cocherie, 2009 (Buzzi, Gaggero, & Oggiano, 2008;Casini et al, 2012;Oggiano, Gaggero, Funedda, Buzzi, & Tiepolo, 2010), and a Lower Metamorphic Complex (LMC), made of paragneisses, micaschists, quartzites and subordinate amphibolite boudins (Cappelli et al, 1991;Carmignani et al, 1994).The Visean collisional evolution is testified by exhumation of HP rocks and southward thrusting of UMC onto LMC. The phase of shortening is associated with nearisothermal decompression and partial melting of UMC in the kyanite stability field (Ferrara, Ricci, & Rita, 1978;Giacomini, Bomparola, & Ghezzo, 2005).…”

Section: Geological Settingmentioning

confidence: 99%

Structural map of Variscan northern Sardinia (Italy)

et al. 2014

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In this paper, we present a geological structural map (1:100,000 scale, 2300 km 2 surface area) of the Variscan basement of northern Sardinia. The map integrates field structural analysis, extensive gamma-ray spectrometry, and high-resolution ELA-ICP-MS U/Th-Pb zircon and monazite dating. A set of 10 samples of granitic rocks collected from different plutons were characterized for their crystallization age. This provided an accurate timing of magmatic events related to the development of the Corsica-Sardinia Batholith. The structural map, complemented with geochronological results represents a benchmark for future studies on Variscan geodynamics.

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“…The structure of Sardinia is characterized by a Paleozoic basement of metamorphic formations intruded by pluton units with granitoid composition. This basement is a fragment of the South-European Hercynian chain, originating from the collision between the Armorican and Gondwana continental margins [1]. This basement is characterized by a marked increase in the metamorphic degree from SW to NE [2,3].…”

Section: Introductionmentioning

confidence: 99%

Geomorphosites in Granitic Environments: An Example from Northern Sardinia (Italy)

Ginesu¹,

Secchi²

2015

JESE-B

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Abstract:A rare geomorphosite and a pillow-like structure appearing as mingling structures due to that mafic and acidic magma interactions are described. Despite the occurrence of spectacular forms in the granitic basement of Sardinia, the morphosites of geological interest linked to the complex evolution of pluton emplacement are still poorly understood. The Fizza Ona outcrop, located near the northeastern coast, is a good example of a geomorphosite in the inner zone developed at the edge of different plutonic units. This outcrop is a well-exposed, pillow-like horizon of less than 5 m in thickness, observable in the field for at least 200 m and underlined by the occurrence of a large tafoni form. In detail, the pillow-like horizon consists of sub-roundly to sub-rounded elements of granitic to micropegmatitic rocks of up to 100 cm in diameter, which is dispersed in the fine-grained granitic host-rock matrix. The outcrop represents a particular example of the emplacement mechanism of granitic magmas in the Sardinian batholith. One aim of this work is the construction of a document for the competent authorities to protection and preservation of this outcrop as a cultural heritage for the history of the geological evolution.

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The hercynian chain in Sardinia (Italy)

Cited by 194 publications

References 1 publication

The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Structural map of Variscan northern Sardinia (Italy)

Geomorphosites in Granitic Environments: An Example from Northern Sardinia (Italy)

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