Stefano Vitale | Università degli Studi di Napoli "Federico II" (original) (raw)

Stefano Vitale

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Papers by Stefano Vitale

Journal of Structural Geology, Sep 17, 2014

A new technique for estimating the finite strain of deformed elliptical markers is presented. Thi... more A new technique for estimating the finite strain of deformed elliptical markers is presented. This method is based on the property of the arithmetic mean (Rf) of the deformed object aspect ratios Rf to reach its minimum value in the undeformed state when they correspond to the initial aspect ratios Ri. The minimized (Ri) (MIRi) iterative method furnishes the best results when, in the pre-strain state, the markers are uniformly orientated for every aspect ratio (Ri) class. A Matlab code, provided in this study, finds the best values of strain Rs and maximum stretching direction X that minimize the arithmetic mean (Ri) ̅ by means of several iterations. In order to define the uncertainties of Rs and X, the code: (i) re-samples h-times the original (Ri,θ) dataset; (ii) assigns random values to the initial long axis angles tetha; (iii) deforms newly the synthetic dataset; (iv) re-applies the MIRi method; and finally (v) estimates the standard deviation for the (Rs,X) values. Tests of the...

Bollettino Societa Geologica Italiana, 2012

This work is aimed to analyze the out-of-sequence thrust fault crosscutting the Apennine Platform... more This work is aimed to analyze the out-of-sequence thrust fault crosscutting the Apennine Platform Unit and the unconformable upper Tortonian wedge-top-basin deposits cropping out in the western sector of the Sorrento Peninsula. These thrusts can be correlated to other out-of-sequence structures spread out in the whole southern Apennine chain. According to their wide diffusion and the constant vergence toward the northern sectors, it is possible to ascribe these structures to a well-defined tectonic stage during the Apennine orogenic evolution, occurred in the upper Messinian-Lower Pliocene interval.

Journal of Geodynamics, 2015

ABSTRACT In order to better understand the orogenic evolution of the Rif chain in the Eocene-Mioc... more ABSTRACT In order to better understand the orogenic evolution of the Rif chain in the Eocene-Miocene interval, we provide new structural and kinematic data for the Jebha area, a key-sector of the Central Rif. Here the thrust sheet superposition occurs along the well-known Jebha-Chrafate lineament, widely considered as a major left-lateral transfer fault that enabled the Miocene westward migration of the internal thrust front. Our structural analysis was mainly focused on (i) the internal deformation of stacked nappes and (ii) the kinematics of the main thrust faults. Five main deformation stages were recognized for the Eocene-Miocene tectonic evolution of this area. The first orogenic pulse (D1), which occurred in the Eocene-Oligocene interval, was responsible for the tectonic stacking of the Ghomaride Nappes. Subsequently between the late Aquitanian and the late Burdigalian, imbrication (stage D2) occurred for some Internal Dorsale Calcaire thrust sheets within a dominant regional ENE-WSW shortening. At the Rif scale, different displacements of the WSW-migrating thrust front were accommodated by transfer structures including the Jebha-Chrafate fault. The following late Burdigalian-Langhian stage (D3) was defined, on the contrary, by a prevalence of the radial thrust front migration. In the Jebha area the early thrusting (stage D3a) was characterized by a main SE-vergence. In this phase the External Dorsale Calcaire and the Maghrebian Flysch Basin units were included in the accretionary wedge. Two late D3 regional deformation phases were probably related to the buttressing effect that followed the collision of the thrust sheet pile against the crustal ramp of the External Rif domain. The first stage (D3b) consisted of an out-of-sequence thrusting recorded in the western sector of the Jebha area with the superposition of the Ghomaride Unit onto the External Dorsale Calcaire Unit, and in the eastern sector with the stacking of the Internal Dorsale Calcaire Unit directly onto the Predorsalian Unit. The second stage (D3c) included a late back-thrusting affecting the whole orogenic chain and deforming all the tectonic contacts. The fourth stage (D4) was characterized by strike-slip faulting and SW-verging folding. This latter mostly affected the successions located to the East of the Jebha village and was partially synchronous with the D3 stage. It was most probably related to the SW migration of the internal thrust-front of the Bokkoya Dorsale Calcaire Complex and a renewed activity of the Jebha-Chrafate fault zone. The last tectonic stage (D5) included a radial extension expressed by high and low-angle normal faults.