1,721,007 research outputs found
Sedimentology, stratigraphy and tectonics of evolving wedge-top depozone: Ariano Basin, southern Apennines, Italy
No full textThe late Zanclean wedge-top Ariano Basin, located in the external sector of the southern Apennines, was initially characterized by alluvial and fan-delta environments and successively, southward of Benevento-Buonalbergo fault, by a gradual drowning with coastal and alluvial plains evolving to shelf and marine coastal settings, respectively. Basin evolution continued with a synsedimentary uplift of different sectors resulting in variations in the drainage pattern and basin shape, and ultimately leading to complete basin closure and transition to continental depositional environments.
Early Pliocene palaeogeography, previous the Ariano Basin activity, is due to regional subsidence and subsequent differential uplifts resulted from geodynamic processes related to both the downgoing Apulian slab and the allochthonous orogenic wedge. Slab break off and the migration of a tear in the southeastward Apulian slab occurred, producing a strong subsidence in the external sectors of the southern Apennines recorded by the development of the Ariano Basin. Subsequently out-of-sequence synsedimentary thrusting, related to thin-skinned tectonics, occurred in the allochthonous units and unconformably overlying wedge-top basin deposits, producing northeastward migration of the main depocenters in the Ariano Basin. Finally renewed thrusting, related to the inversion of pre-existing normal faults located in the buried Apulian Platform and enhanced by regional uplift, affected the whole tectonic and sedimentary pile, as recorded by deformation of the overlying Pliocene deposits
Sedimentary and tectonic evolution of the Pliocene Ariano wedgetop basin (southern Apennines, Italy)
No full textStructural analysis of Nord-Calabrese, Parasicilidi and Sicilidi units (southern Cilento and Calabria-Lucania boundary)
No full textStructural analysis of the Liguride Units and related wedge-top basin deposits (Campania region, southern Italy)
No full text
Tectono-stratigraphic and kinematic evolution of the southern Apennines/Calabria-Peloritani Terrane system (Italy)
No full textWe provide kinematic analysis of southern Apeninnes/CPT tectonic evolution
We grouped preorogenic and foredeep successions in nine kinematic complexes
We furnish a Late Oligocene to recent western Mediterranean paleogeography evolution
We analyzed shortening estimations, rotations and tectonic vergence
Structural analysis and stratigraphy of Internal units (Calabria-Lucania boundary, Southern Italy)
No full textTectonic evolution of the ‘Liguride’ accretionary wedge in the Cilento area, southern Italy: a record of early Apennine geodynamics
No full textThe early stages of southern Apennine development have been unraveled by integrating the available stratigraphic record provided by synorogenic strata (of both foredeep and wedge-top basin environments) with new structural data on the Liguride accretionary wedge cropping out in the Cilento area, southern Italy. Our results indicate that the final oceanic subduction stages and early deformation of the distal part of the Apulian continental margin were controlled by dominant NW–SE shortening. Early Miocene subduction-accretion, subsequentwedgeemplacement on top of the Apulian continental margin and onset of footwall imbrication involving detached Apulian continental margin carbonate successions
were followed by extensional deformation of the previously ‘obducted’ accretionary wedge. Wedge thinning also enhanced the development of accommodation space, filled by the dominantly siliciclastic Cilento Group deposits. The accretionary wedge units and the unconformably overlying wedge-top basin sediments experienced renewed NW–SE shortening immediately following the deposition of the Cilento Group (reaching the early Tortonian), confirming that the preceding wedge thinning represented an episode of synorogenic extension occurring within the general framework of NW–SE convergence. The documented Early to the Late Miocene steps of southern Apennine development are clearly distinct with respect to the subsequent (late Tortonian-Quaternary) stages of fold and thrust belt evolution coeval with Tyrrhenian back-arc extension, which were characterized by NE-directed thrusting in the southern Apennines
Inversion tectonics in southern Apennines: an example from the Chianello Mt (Campania, southern Italy)
No full textImproved statistical multi-scale analysis of fractured reservoir analogues.
No full textThis paper includes the results of the application of novel methodologies for the statistical analysis of tensile
fracture attributes (spacing, density, and aperture). The statistical methods have been applied to a fractured
Lower Cretaceous carbonate succession cropping out in the Sorrento Peninsula (Naples area, Italy),
representing a geological analogue of buried reservoirs of southern Apennines major oil fields. As fracture
networks (observable from outcrop to the crystal scale) can significantly affect the hydraulic behavior of a
fractured reservoir, the definition of appropriate models of fracture spacing and aperture probability
distribution at various scales represents an important goal of structural analysis. In order to achieve such an
objective, sampling has been carried out at different scales, by means of traditional scan lines at outcrop, as
well as micro-scan lines carried out both by a digital micro-camera (50×) and by the optical microscope
(200×). Fracture spacing and density analysis are mainly aimed at establishing the characteristics of joint
spatial distribution over a range of scales. Aperture analysis is aimed at verifying that the aperture cumulative
frequency is described by a power law and, in the latter instance, to provide an effective method for a more
precise determination of the exponent of the power law. Finally, new expressions are provided, in closed
form, in order to calculate the confidence interval of the power-law exponent. The proposed criteria provide
handy and effective methods for a significantly improved statistical analysis of fracture attributes
- …
