56 research outputs found
I volgarizzamenti e la felicità mentale: l' 'umana perfezione' nella "Filosofia naturale" di Alessandro Piccolomini.
No full textDialoghi interculturali: la letteratura francofona e Yasmina Khadra. Un progetto tra università e scuola secondaria di primo grado
No full textNell'ambito del trentesimo anniversario del festival Dedica di Pordenone, l'Università di Udine e la scuola secondaria di primo grado “Ellero” hanno intrapreso un progetto collaborativo mirato all'esplorazione della letteratura francofona attraverso l'opera dell’autore algerino Yasmina Khadra. Questo articolo esamina il progetto sinergico che ha impiegato il film Les hirondelles de Kaboul (2019) come mezzo per approfondire la comprensione culturale e linguistica degli studenti sul mondo francofono.
As part of the 30th anniversary of the Dedica festival in Pordenone, the University of Udine and the ‘Ellero’ middle school undertook a collaborative project aimed at exploring Francophone literature through the work of Algerian author Yasmina Khadra. This article examines the synergetic project that employed the movie Les hirondelles de Kaboul (2019) as a means to deepen students' cultural and linguistic understanding of the Francophone world
Una mappa per l'inventio. L'Etica Nicomachea e la prima giornata del Decameron
No full textThis paper points out a new philosophic source of Decameron First Day, that is, books III and IV of Aristotle’s Nicomachean Ethics. The author also discusses the rhetorical devices of Boccaccio’s rewriting and its meaning in the semantic structure of his whole book. In general, Boccaccio uses Aristotle’s text contents as narrative topoi in order to shape some of the narrative features of the fabula, or to provide a motivational support for the behaviour of the different characters. But also Aristotle’s dispositio models contribute to establish a syntagmatic order in the succession of First Day tales
The Arkot Dag Melange Central Turkey: Evidence for the geodynamic evolution of the Intra-Pontide Suture zone.
No full textThe geological setting of Turkey (figure 1)can be described as an assemblage of continental terranes separated by ophiolite-bearing suture zones that mark the areas where the PaleoTethyan and NeoTehyan oceanic basins were destroyed. In northern Turkey, one of the most important suture zones is represented by the Intra-Pontide one consisting of an east-west trending belt of deformed and/or metamorphic units located at the boundary between the Istanbul-Zonguldak terrane to the north and the Sakarya terrane to the south. These units can be regarded as issued from the Intra-Pontide domain, whose geodynamic history is still a matter of debate. Along the Akpinar-Araç-Bayramoren geotraverse, located in central Turkey, an ophiolite-bearing mélange, known as the Arkot Dağ Mélange, is well-exposed along the Intra-Pontide suture zone (figure 2). The Arkot Dağ Mélange can be described as an Upper Santonian chaotic sedimentary deposit consisting of an up to 1000-m-thick succession of slide-blocks of different sizes and lithologies enclosed in a sedimentary matrix consisting of shales, coarse-grained arenites, pebbly mudstones and pebbly sandstones. The slide-blocks, from a few meters to hectometers in size, are represented by metamorphic rocks (mainly micaschists and gneisses), by ophiolites (peridotites, gabbros, IAT and BAB basalts and cherts) and by sedimentary rocks (cherts, neritic and pelagic limestone, marly limestone and ophiolite-bearing turbidites). The youngest age among the slide-blocks has been provided by the ophiolite-bearing turbidites where a late Coniacian nannofossil assemblage has been found. The cherts have provided a wide range of ages from the Middle Triassic to Late Cretaceous, whereas the fossils found in the limestone indicate Late Jurassic to Early Cretaceous ages. The matrix of the Arkot Dağ Mélange, even if unaffected by metamorphism, shows deformations represented by multiple meters-thick cataclastic shear zones at the boundaries of the mélange slices or inside them. According to its features, the source area of the Arkot Dağ Mélange was most likely a stack of continental and oceanic thrust sheets emplaced in the Late Cretaceous onto a continental margin. The data collected from the different slide-blocks suggest that the Intra-Pontide domain was characterised by an oceanic basin that opened at the latest in the Early Jurassic. The opening of the Intra-Pontide oceanic basin was followed by the development of a subduction zone with a subsequent opening of suprasubduction oceanic basin in the Middle Jurassic – Early Cretaceous. The convergence in this suprasubduction oceanic basin started at the Early/Late Cretaceous boundary by an obduction process, whereas its final closure can be regarded as Late Paleocene (figure 3)
Geological setting and geochemical signatures of the mafic rocks from the Intra-Pontide suture zone: implications for the geodynamic reconstruction of the Mesozoic Neotethys.
No full textA number of suture zones exist in Turkey, which is believed to represent the closure of Paleo and NeoTethyan oceanic basins. Regarding the development of the latter oceanic entity, namely Neotethys, the geodynamic evolution of the Intra-Pontide branch, the northernmost one of a number of oceanic basins remains enigmatic. The Intra-Pontide Suture Zone (IPSZ) in Northwest Turkey includes several tectonic units most of which are characterized by the occurrence of mafic rocks with distinct geochemical signatures. In this paper, the mafic rocks collected from four of these units (the Domuz Dağ Unit, the Saka Unit, the Daday Unit and the Arkot Dağ Mèlange) have been studied in detail along two selected transects. The Domuz Dağ Unit is characterized by amphibolites, micaschists and marbles, which have been overprinted by low-grade metamorphism.The Saka Unit is in turn represented by an assemblage of slices of amphibolites, marbles and micaschists metamorphosed under upper amphibolite facies metamorphic conditions in the Late Jurassic time. In these units, the amphibolites and their retrograded counterparts display E-MORB-, OIB- BABB- and IAT-type signatures. The Daday Unit is characterized by metasedimentary and metamafic rocks metamorphosed under blueschist to sub-greenschist facies conditions. The metamafic rocks comprise actinolite-bearing schists and Na-amphibole-bearing varieties possibly derived from basaltic and gabbroic protoliths. They have a wide range of chemical compositions, displaying N-MORB-, E-MORB-, OIB- BABB- and IAT-type signatures. The Arkot Dağ Mèlange consists of a Late Santonian assemblage of slide-blocks mainly represented by basaltic lithologies showing affinities ranging from N-MORB- and IAT- to BABB-type magmas. The geochemical signature of the studied mafic rocks indicates that the tectonic units documented along the two studied transects of the Intra-Pontide Suture Zone have been derived from a supra-subduction zone. This hypothesis corroborates the available data collected from the Aylı Dağ Ophiolite Unit cropping out in the westernmost studied transect. This finding can provide new insights for the reconstruction of the geodynamic history of the Intra-Pontide domain
The intra-pontide suture zone, northern turkey: an updated view
No full textThe tectonic setting of Turkey can be described as a puzzle where several continental terranes are boubded by ophiolite-bearing suture zones (Sengör and Yılmaz, 1981). Among these suture zones, the Intra-Pontide Suture Zone (IPSZ) is probably the less known one. The IPSZ is an east-west trending, suture zone that stretches for about 600 km dividing the Istanbul-Zonguldak terrane, in the north, from the Sakarya terrane, in the south. This suture zone is well exposed along the Daday-Arac-Kursunlu and Tosya – Emirköy geotraverses in northern-central Turkey where its tectonic features can be fully reconstructed.
The study of the two geotraverses indicates that the imbricate stack of the IPSZ consists of several distinct tectonic units, all characterized by the occurrence of mafic rocks. These units include the Aylı Dağ ophiolite Unit, the Arkot Dağ Mèlange and three metamorphic units (the Daday, Domuz Dağ and Devrekani Units). This imbricate stack is probably the result of several episodes of out-of-sequence thrusts that affected the whole IPSZ.
The Aylı Dağ Unit (Göncüoglu et al., 2012) includes an about 5 km-thick, not metamorphic ophiolite sequence topped by the middle Bathonian to early Callovian radiolarian cherts. In addition, a metamorphic sole is present at the base of the serpentinized peridotites. The geochemical evaluation of pillow-basalts and dykes highlights subduction-related characteristics, similar to IAT- and BABB-type lavas generated in a back-arc oceanic basin.
The Arkot Dağ Mèlange (Göncüoglu et al., 2014) consists of an assemblage of slide-blocks, with different size and lithology, enclosed in a Late Santonian sedimentary matrix. The slide-blocks also include ophiolitic lithologies, mainly represented by basalts, but gabbros and peridotites are also found. The slide-blocks of basalts display affinites to IAT- and BABB-type magmas, signifying the involvement of subduction component, whereas no MORB-like basalt have been found. The age of the radiolarian chert blocks ranges between Middle-Late Triassic (Tekin et al., 2012) to Late Cretaceous.
The Daday unit (cf. Martin Unit by Okay et al., 2013) is characterized by metasedimentary and metabasic slices deformed under low-grade blueschist metamorphic facies conditions (in the Early Cretaceous (ca. 110 Ma; Rb–Sr method on mica; Okay et al., 2012). The metasedimentary rocks include mica-bearing schists, fine-grained marbles and quartzites, which inclue detritial zircons mainly derived from an Early Carboniferous felsic magmatic source. The metabasic lithologies, on the other hand, comprise actinolite-bearing schists and Na-amphibole-bearing varieties possibly derived from basaltic and gabbroic protoliths. The metabasic rocks have a wide range of chemical compositions, displaying N-MORB-, E-MORB-, OIB- BABB- and IAT-type signatures.
The Devrekani Unit is represented by an assemblage of amphibolites, marbles and micaschists showing a metamorphic climax developed under upper amphibolite facies in the Late Jurassic time (ca. 163 Ma; mica Ar-Ar geochronology; Marroni et al., 2014). Amphibolites recorded pressures of ~0.80–0.99 GPa and temperatures of ~600°C. Comparable P-T conditions were obtained for the micaschist (P ~0.86 GPa and T ~ 640°C)(Marroni et al., 2014). The amphibolites display E-MORB-, OIB- BABB- and IAT-type signatures.
The Domuz Dağ Unit is in turn mainly represented by eclogites and amphibolites with minor micaschist, gneisses and marbles deformed under eclogite facies metamorphism (490°C and 1,7 Gpa; Okay et al., 2006) of Early Cretaceous age (ca. 105 Ma; mica Ar-Ar geochronology; Okay et al., 2006).
The three metamorphic units, referred by Okay et al (2006; 2013) as the Central Pontide Supercomplex, represent subduction-related mèlanges developed at different depths in a subduction zone during the Middle Jurassic-Early Cretaceous time span. This subduction zone probably developed since Early Jurassic in the Intra-Pontide oceanic basin (IPOB) as result of the convergence between Istanbul-Zonguldak and Sakarya continental margins. The occurrence of calc-alkaline volcanic rocks of Late Cretaceous in the sedimentary cover of Istanbul-Zonguldak terrane strongly suggests that the subduction was north-dipping. In this framework, the ophiolites from the Aylı Dağ Unit can be interpreted as the remnants of a Late Jurassic back-arc basin opened above this north-dipping subduction. As result of the continuous convergence, the back-arc basin started to close in the Late Cretaceous time leading to the obduction of the Aylı Dağ ophiolites onto the Sakarya continental margin. During the obduction, the Arkot Dağ Mèlange originated. In the Late Paleocene, the final closure of the IPOB led to development of the imbricate stack of tectonic units that characterizes the IPSZ, whose structures are sealed by the Early Eocene shallow-water deposits
Analysis of the North Anatolian Shear Zone in Central Pontides (Northern Turkey): insight for geometries and kinematics of deformation structures in a transpressional zone.
No full textThe western part of the North Anatolian Shear Zone at the southern boundary of the Central Pontides in Turkey, was investigated in the Kurşunlu-Araç area by means of a geological-structural field study. In this area the North Anatolian Shear Zone results in a transpressional deformation zone that extends between two master faults striking parallel to the main shear direction. The main systems of structures identified in the deformation zone appear to be oriented parallel to the directions predicted by Riedel theoretical model. Nevertheless, the strain partitioning is more complicated than predicted by theory. The structural analysis suggests a polyphase deformation characterized by a steady component of transcurrence associated with alternance of compression and extension. Along each of theoretical directions the combination of double verging structures can be observed, with folds and thrust surfaces root into high-angle shear zones, according to flower-type geometries. The discrepancies of directions, kinematics and geometries from theoretical models are due to transpressive and/or transtensive nature of the deformation. According to the observed outcropping structures, we propose a conceptual model for the North Anatolian Shear Zone, interpreting it as a crustal-scale positive flower structure
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