1,721,110 research outputs found
An attempt at modelling the lithosphere of Sardinia block and surroundings: relationships among isostatic disequilibrium, geomorphic features and neotectonics
No full textMechanical influence of inherited folds in thrust development: A case study from the variscan fold-and-thrust belt in SW sardinia (Italy)
Full text linkFold-and-thrust belts have a high variability of structural styles, whose investigation provides continuous updates of the predictive models that try to better approximate the geometries recognized in the field. The majority of studies are focused on the geometry and development of folds and thrust surfaces and the amount of displacement, taking into account the role played by the involved stratigraphic succession assumed as a layer cake. We present a case study from the external zone of the Variscan fold-and-thrust belt in SW Sardinia, where it was possible to investigate the lateral and vertical variations of the mechanical properties of the involved succession, how they related to previous folding, control thrust geometry, and kinematics. In this case, the superposition of two fold systems acted as a buttress that induced extensive back-thrusting. We found that there is a close connection between the attitude of the bedding and the geometry of back thrust surfaces, shear strength during thrust propagation, and variation in the shortening amount, de-pending on which part of the folds were cut across. The folding-related mechanical anisotropy also seems to have induced a ductile deformation in the footwall of back-thrusts. Although the case study considers the development of back-thrust, the relations between thrust and not-layer cake geometries could also be applied to fore-thrust development
From power-law to viscous linear processes in the Baccu Locci mylonites: On the way to steady-state
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Tertiary structures of North Sardinia: A primary control on geothermal resource
No full textNew structural studies carried out in N-Sardinia allowed to reconstruct a 3D model of the Anglona area that account for the thermal circuits hosted in Tertiary strike-slip faults, which crosscut the Variscan basement and form a plumbing network for water hosted in deep seated reservoirs. © Società Geologica Italiana, Roma 2013
Note illustrative della Carta Geologica d’Italia alla scala 1/50.000 Foglio 548 Senorbì
No full textGravity field and geothermal structure of the Corsica-Sardinia Block
No full textThis paper presents a finite-differences 3D numerical model that simulates the gravity and thermal structure of the Corsica-Sardinia Block (CSB), an apparently stable lithospheric domain characterized by cryptic tectonic activity. In the experiments, we change the density and heat production rate of the model crust within a range of geologically realistic values to fit the measured Bouguer gravity anomaly and surface heat flow pattern. The discrepancy between the observed geophysical structure and the outcomes of numerical modelling are discussed in relation to the composition of the CSB crust and finally recast in the geodynamic framework of the western Mediterranean region
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