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RESEARCH PROGRAM

italiano - inglese
Research Units
Similar research programs:
Scientific and education field classification
International Patent Classification
  • FIXED CONSTRUCTIONS
    • BUILDING (layered materials, layered products in general B32B)
      • GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; [N: electromagnetic shielding H05K9/00A])
    • DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
      • FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00)
  • PHYSICS
    • MEASURING (counting G06M); TESTING
      • GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS (detecting or locating foreign bodies for diagnostic, surgical or person-identification purposes A61B; means for indicating the location of accidentally buried, e.g. snow-buried persons A63B29/02; investigating or analysing earth materials by determining their chemical or physical properties G01N; measuring electric or magnetic variables in general, other than direction or magnitude of the earth\'s field G01R; electronic or nuclear magnetic resonance arrangements G01R33/20; radar, sonar or analogous methods in general, detecting masses or objects involving these methods G01S)
Geographical classification
Keywords
CALABRIA (SOUTHERN ITALY); SUBDUCTION; CRUSTAL AND UPPER MANTLE STRUCTURE; UPLIFT; LABORATORY MODELLING; GEOCHEMISTRY; OROGENIC WEDGE; MANTLE CIRCULATION; ISOTOPIC GEOCHEMISTRY

Recent evolution of Calabrian subduction zone: geological, seismological, geochemical constraints and laboratory modelling.

Università degli Studi Roma Tre
Abstract
About 30-35 Myr ago, the subduction plane, which presently occurs beneath the Calabrian arc, was developed along the Iberian margin between the Apennines and Gibraltar. In the Central Mediterranean the neogenic evolution was characterised mostly by the backward motion of the subduction zone. This motion induced the formation of the Liguro-Provencal (30-16 Ma) and Tyrrhenian (12-0 Ma) backarc basins. During the last 10 Myr, the subucting slab has been progressively deformed such that subuction windows formed within the slab. These windows are presently recognised beneath the Sicily Channel and beneath the Apennines. This process has led to the reduction of the width of the active subduction zone (less than300 km) and to the formation of the Calabrian arc. Deformations of the subducting slab probably influenced the thermal regime of the arc region, the volcanism, and the slab kinematics. Although the Calabrian subduction zone has been studied through geological, seismological, and geochemical methods, several aspects of subduction in this region are still unclear. It is not clear, in fact, whether the subduction and accretion processes are still active, the shallow geometry of the subduction zone, the cause and the mechanism of the Calabrian uplift, the temporal and spatial relationships between orogenic and anorogenic volcanism. The principal aim of this research project consists in defining thermal and mechanical mechanisms, which controlled the evolution of subduction >>>

Principal Investigator
Claudio FACCENNA Università degli Studi ROMA TRE
Research Objectives
The principal aim of this research project is the definition of thermal and mechanical mechanisms, which controlled the evolution of subduction, convergence and magmatism processes in the Calabrian arc during the past 10 Myr. The above-mentioned aim will be pursued by integrating different methods. Partial objectives are as follows:
- Definition of the present geometry and structure both at the crust and at the mantle levels for the subduction system. These results will be obtained by seismic tomography and by the analysis of anisotropy of seismic wave propagation (the seismic tomography will provide also important parameters about the seismic sources) (Messina Unit).
- Definition of seismic structures and of seismic stress regime in the subducting plate and in the overlying tectonic units. These results will be obtained by the analysis of earthquake data (hypocentral location, focal mechanisms, stress and strain tensors) (Messina Unit).
- Analysis of active deformation in the Calabrian accretionary wedge by interpretation of offshore seismic reflection profiles. New seismic reflection profiles (high-resolution) will also be acquired in some key offshore areas (Roma TRE Unit).
- Definition of geometries and age of thrust-and-fold deformation in the Calabrian accretionary wedge by interpretation of offshore seismic reflection profiles. By balanced restoration of the geological cross sections, we will reconstruct the spatial-temporal convergence >>>

Timescale
24 months
National and international background
The slow convergence between Africa and Europe has produced collisions among continental blocks and subduction of oceanic basins. During Neogene, in particular, subduction processes in the Mediterranean area were particularly active and generated back-arc basins such as the Ligurian-Provencal basin, the Algerian basin, the Tyrrhenian basin, and the Aegean basins. At present, remains of the subduction processes are seismologically recognised beneath the Ellenic arc and the Calabrian arc. In Calabria, the Wadati-Benioff plane and the tomographic images allow recognition of a narrow subducting slab (less than 300 km) dipping at high-angle toward the northwest and presently undergoing in-plane compression stresses (Selvaggi and Chiarabba, 1995; Figura 1).

image


Figure 1 - Tectonic map of the Southern Tyrrhenian Sea showing subduction related volcanoes (light grey) and alkaline intraplate volcanoes (dark grey). Note that the Vulture affinity is controversial. Dashed lines indicate isobath of the Wadati-Benioff zone.
While several Authors agree on the key role played by the subduction processes in the Mediterranean tectonics (e.g., Malinverno and Ryan, 1986; Patacca et al., 1990; Bonardi et al., 2001; Doglioni et al., 2001; Faccenna et al., 2004), the present and recent tectonic activity of the slab as well as the causes for its narrow thickness are still uncertain. High-resolution tomographic analyses have recently >>>