1,721,262 research outputs found
Bioetica e etica comunitarista
No full textIntervento al Convegno su "I diritti dell'uomo e la bioetica" organizzato dall'Azienda Policlinico Umberto I Università degli Studi La Sapienza e il Centro di formazione ECM a Lari (Pisa) il 14-15 maggio 200
A MATLAB-derived software (geothermMOD1.2) for one-dimensional thermal modeling, and its application to the Corsica-Sardinia batholith
No full textLate orogenic collapse and thermal doming in the northern Gondwana margin incorporated in the Variscan Chain: a case study from the Ozieri Metamorphic Complex, northern Sardinia, Italy
No full textA branch of the South European Variscan chain is noticeably exposed in Sardinia. The early stage of collision between the Northern Gondwana margin and the Armorica Terrane Assemblage (ATA) generated syn-metamorphic folding and thrusting. The evidences of such deformation are well preserved in the nappe zone, a structural domain characterized by stacking of different tectonic units under metamorphism of Barrovian greenschist facies. A late, post-nappe, shortening, under retrograde metamorphic conditions, gave rise to wide, upright, N120-N160 trending antiforms that control the trend of the chain. The structural analysis of the Ozieri Metamorphic Complex (OMC) shows evidence of an important phase of late-Variscan extensional tectonics. Deformation results in, the formation of oppositely dipping, normal shear zones, which developed at upper and middle structural level along the limbs of major regional antiforms causing fabric reactivation, crustal thinning, and exhumation of the OMC core. Within the OMC, the activity of the shear zones was coeval with HT-LP metamorphism as suggests the occurrence of syn-kinematic cordierite + andalusite ± sillimanite + biotite. Whereas syntectonic dykes and a tonalite body in the deeper part of the OMC indicate that early emplacement of melt along shear zones and/or in the antiform hinges possibly supplied the heat for the anomalous thermal gradient and triggered the exhumation of a core complex-like structure
Evidences for extensional tectonics associated to thermal relaxation in the Variscan chain of central northern Sardinia (Italy) [Evidenze di una tettonica estensionale associata al rilassamento termico nella Catena Varisica della Sardegna Centro-Settentrionale (ITALIA)]
No full textPart of the South-European Variscan chain is exposed in Sardinia, The structures derived from the collision between the Northern Gondwana margin and the ATA (Armorica Terrane Assemblage) control the structural frame of the chain, nevertheless the structural analysis of a sector of the Nappe Zone, near Ozieri, evidenced an important post-collision tectonics that took place in concomitance with late-orogenic granitoids emplacement
From the geodynamics of peri-Gondwanan terranes to the Permian Meso-Europe. a perspective from the Variscan segment of Sardinia
No full textDuring the last years a good deal of works were carried out in the Sardinia Variscides focusing on metamorphic and igneous petrology, structural geology and stratigraphy, the latter mostly in the late orogenic basins. The results along with the increasing availability of geochronological data allows, not only bridging the gap of knowledge between the Sardinian Variscides and other sectors of the Variscan Chain, but offer also the chance to introduce new hypotheses on the evolution of this orogenic cycle. Yet, still intriguing issues need to be deepened concerning both the pre collisional Palaeozoic geodynamic and the collisional to post-collisional evolution. © Società Geologica Italiana, Roma 2013
Spatial structure of organic viticulture: Evidence from Chianti (Italy)
Get PDFSeveral studies have stressed the existence of agglomeration effects in organic farming. However, due to a different incentive framework, viticulture can be con- sidered an exception in the light of this general evidence. Applying a spatial Durbin Bayesian probit model to census data for the area of production of Chianti Classico DOCG (Italy), no spatial relation in the farmer’s decision to convert to or maintain organic viticulture emerged and spatial spillovers have a marginal role in terms of affecting viticulturists’ behaviour. An explanation for this evidence is the existence of quasi-monopsonic power in output markets with strict production standards, which limits spatial agglomeration effects. Structural factors such as s- mall-size farm, farmer education and younger age are the main direct determinants for predicting the likelihood of being involved in organic viticulture
Evidence for water-assisted diffusional creep preserved in the mylonitic gneisses of Giuncana, northern Sardinia, Italy
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