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9 results on '"Vezzani, L."'

7. Normal faulting, extension and uplift in the outer thrust belt of the central Apennines (Italy): role of the Caramanico fault.

Author

Ghisetti, F and Vezzani, L

Subjects
*THRUST faults (Geology), *KINEMATICS
Abstract

Abstract The outer Adriatic zones of the central Apennines (Italy) provide good conditions for analysing geometry and kinematics of the earliest normal faults, superposed onto the thrust belt. During the latest stages of thrusting onto the Adriatic foreland (late Pliocene–early Pleistocene), the outermost imbricates of the thrust belt were subjected to normal faulting, coeval with differential uplift. Crosscutting normal faults get younger towards the foreland, thus the easternmost normal faults record the latest stages of fault propagation and growth. The Caramanico fault, on the western flank of Mt. Maiella, is the largest outcropping normal fault of the outer zones. This high-angle fault (dip > 70°) has cumulative offsets ≤ €4.2 km, and propagated with slip rates of 2.6 mm/year in a short time interval (≤ 1.6 Ma), concomitant with intense uplift of Mt. Maiella. In contrast with normal faults in a more internal position, the Caramanico fault maintains a high-angle planar geometry, and does not reach the major basal detachment of the thrust belt. Thus the fault did not cause large extensional displacements; its major role was rather to accommodate ongoing components of vertical uplift of the overthickened thrust wedge. Downfaulting of the thrust belt on the western flank of Mt. Maiella represents the youngest end member of the same processes that have operated since 11 Ma in the Tyrrhenian hinterland, where large extensional strains and crustal thinning of the orogenic belt were achieved by long-lasting activity of listric normal faults detached at lower crustal depths. [ABSTRACT FROM AUTHOR]

Published
2002
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9. Peri-Adriatic mélanges and their evolution in the Tethyan realm

Author

Yildirim Dilek, Claudio Corrado Lucente, Gian Andrea Pini, Andrea Festa, Livio Vezzani, Giulia Codegone, Kei Ogata, Francesca Ghisetti, Festa, A., Pini, G. A., Dilek, Y., Codegone, G., Vezzani, L., Ghisetti, F., Lucente, C. C., Ogata, K., Geology and Geochemistry, Pini, GIAN ANDREA, Festa A., Pini G.A., Dilek Y., Codegone G., Vezzani L., Ghisetti F., Lucente C.C., and Ogata K.

Subjects
Continental collision, mud diapirs, subduction channels, Olistostrome, Obduction, broken formations, Paleontology, Oceanic crust, Passive margin, Subduction processe, Broken formation, subduction processes, Extensional tectonics, SDG 14 - Life Below Water, Mud diapir, Olistostromes, olistostromes, Mud diapirs, Subduction processes, Subduction channels, Subduction, Subduction channel, Geology, Geophysics, obduction, Tectonics, Sedimentary rock, broken formation
Abstract

In the peri-Adriatic region, mélanges represent a significant component of the Apennine and Dinaride-Albanide-Hellenide orogenic belts as well as ancient and present-day accretionary wedges. Different mélange types in this broad region provide an excellent case study to investigate the mode and nature of main processes (tectonic, sedimentary, and diapiric) involved in mélange formation in contrasting geodynamic settings. We present a preliminary subdivision and classification of the peri-Adriatic melanges based on several years of field studies on chaotic rock bodies, including detailed structural and stratigraphic analyses. Six main categories of melanges are distinguished on the basis of the processes and geodynamic settings of their formation. These mélange types are spatially and temporally associated with extensional tectonics, passive margin evolution, strike-slip tectonics, oceanic crust subduction, continental collision, and deformation. There appears to have been a strong interplay and some overlap between tectonic, sedimentary, and diapiric processes during mélange formation; however, in highly deformed regions, it is still possible to distinguish those melanges that formed in different geodynamic environments and their main processes of formation. This study shows that a strong relationship exists between melange-forming processes and the palaeogeographic settings and conditions of mélange formation. Given the differences in age, geographic location, and evolutionary patterns, we document the relative importance of mélanges and broken formations in the tectonic evolution of the peri-Adriatic mountain belts.

Published
2010

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