Journal ArticleDOI
A proposal for the kinematic modelling of W-dipping subductions - possible applications to the Tyrrhenian-Apennines system
TLDR
In this article, a frontal wedge is constructed from the stacking of the upper layers of the subducting plate and the syntectonic clastics that fill the foredeep which are progressively involved in thrusting and later by extension.Abstract:
In W-dipping subduction zones there is a general eastward progression of the back-arc basin-accretionary wedge-foredeep complex. With the forward progression, early stages of the complex are revealed by slices of upper crust and sedimentary cover abandoned to the west left floating above a new section of mantle. A major shear zone should form at the new Moho separating upper crust slices of earlier accretionary stages and the eastward flowing mantle. The mantle wedging at the top of the subduction plane could be responsible for the uplift of the central parts of the belt. The retreating of the subduction hinge is interpreted as due to the push generated by the ‘eastward mantle flow detected in the hot spot reference frame. The foredeep depth is mainly a function of the radius of curvature of the subduction hinge. The frontal wedge is constructed from the stacking of the upper layers of the subducting plate and the syntectonic clastics that fill the foredeep which are progressively involved in thrusting and later by extension. In order to preserve volume balance, the lithosphere of the eastern plate before subduction has to be the same size as that which has been subducted: due to the longer length of the arc with respect to the original length of the linear margin between the two converging plates, laterally stretched subducted lithosphere is predicted at depth. W-dipping subductions usually have a short life probably due to their inherent capability to produce new lateral heterogeneities of the lithosphere (the thin back-arc) which are a key factor in controlling and generating new subductions (both E- and W-dipping). This model is applied to the Apennines-Tyrrhenian Sea system.read more
Citations
More filters
Journal ArticleDOI
On the post-25 Ma geodynamic evolution of the western Mediterranean
TL;DR: Palaeo-reconstruction of the Apenninic arc suggests about 775 km of migration from the Late Oligocene to present along a transect from the Gulf of Lions to Calabria.
Journal ArticleDOI
Markers of the last interglacial sea-level high stand along the coast of Italy: Tectonic implications
Luigi Ferranti,Fabrizio Antonioli,Barbara Mauz,Alessandro Amorosi,Giuseppe Dai Pra,Giuseppe Mastronuzzi,Carmelo Monaco,Paolo E. Orrù,Marta Pappalardo,Ulrich Radtke,P. Renda,Paola Romano,Paolo Sansò,Vladimiro Verrubbi +13 more
TL;DR: A compilation of the Marine Isotope Substage (MIS 5.5) sites spanning the coastline of Italy allows a picture of the vertical displacement pattern affecting the Central Mediterranean coasts since the Late Pleistocene to be drawn.
Journal ArticleDOI
The Puglia uplift (SE Italy): An anomaly in the foreland of the Apenninic subduction due to buckling of a thick continental lithosphere
TL;DR: In this paper, structural signatures comparing the central Adriatic Sea and the Puglia region were found, and the geometry and the kinematics of the frontal accretionary wedge and related foreland changed from that moment on between the two areas.
Journal ArticleDOI
Active Tectonics in the Central Apennines (Italy) – Input Data for Seismic Hazard Assessment
Fabrizio Galadini,Paolo Galli +1 more
TL;DR: In this paper, the authors defined a reliable framework of active faults in the southern Umbria and AbruzziApennines and showed that activation of the investigated faults may result in earthquakes ofM = 6.5-7.5 which originated in the investigated Apennine sector.
References
More filters
Journal ArticleDOI
Extension in the Tyrrhenian Sea and Shortening in the Apennines as Result of Arc Migration Driven by Sinking of the Lithosphere
TL;DR: In this paper, an arc migration model was proposed to explain the dynamic relationship between extension in the Tyrrhenian basin and compression in the Apennines, and the estimated contemporaneous (post-middle Miocene) amounts of extension and shortening in the apennines appear to be very similar.
Journal ArticleDOI
Geological evolution of the tethys belt from the atlantic to the pamirs since the LIAS
J. Dercourt,L.P. Zonenshain,L. E. Ricou,V. G. Kazmin,X. Le Pichon,A. L. Knipper,C. Grandjacquet,I.M. Sbortshikov,J. Geyssant,Claude Lepvrier,D.H. Pechersky,J. Boulin,Jean-Claude Sibuet,L. A. Savostin,O. Sorokhtin,M. Westphal,Mikhail L. Bazhenov,J. P. Lauer,B. Biju-Duval +18 more
TL;DR: In this article, the evolution of the Tethys belt from the Pliensbachian (190 Ma) to the Tortonian (10 Ma) is depicted at 1 20,000,000 scale.
Journal ArticleDOI
Sea-floor spreading and continental drift
TL;DR: In this article, a geometrical model of the surface of the earth is obtained in terms of rigid blocks in relative motion with respect to each other, and a simplified but complete and consistent picture of the global pattern of surface motion is given on the basis of data on sea-floor spreading.
Journal ArticleDOI
The hellenic arc and trench system: A key to the neotectonic evolution of the eastern mediterranean area
TL;DR: In this paper, the authors used the fault plane mechanisms of shallow earthquakes along the Hellenic arc and the extent of the intermediate seismic belt to make a quantitative estimate of the relative motion occurring between the Hellenians arc and adjacent sea floor.
Journal ArticleDOI
Back-arc opening and the mode of subduction
Seiya Uyeda,Hiroo Kanamori +1 more
TL;DR: In this paper, the authors investigated the difference in the stress state in the back-arc area between the two types of trench-arc systems: compression in the Chilean type and tension in the Marianas type.