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Volume 6, issue 2
Solid Earth, 6, 669–679, 2015
https://doi.org/10.5194/se-6-669-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Solid Earth, 6, 669–679, 2015
https://doi.org/10.5194/se-6-669-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Jun 2015

Research article | 10 Jun 2015

Subduction or delamination beneath the Apennines? Evidence from regional tomography

I. Koulakov1,2, A. Jakovlev1,2, I. Zabelina1,2, F. Roure3,4, S. Cloetingh4, S. El Khrepy5,6, and N. Al-Arifi6 I. Koulakov et al.
  • 1Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Prospekt Koptyuga, 3, 630090, Novosibirsk, Russia
  • 2Novosibirsk State University, Novosibirsk, Russia, Pirogova 2, 630090, Novosibirsk, Russia
  • 3IFP-Energies Nouvelles, Rueil-Malmaison, France
  • 4Tectonics Group, Utrecht University, the Netherlands
  • 5King Saud University, Riyadh, Saudi Arabia, P.O. Box 2455, Riyadh 11451, Saudi Arabia
  • 6National Research Institute of Astronomy and Geophysics, NRIAG, 11421, Helwan, Egypt

Abstract. In this study we present a new regional tomography model of the upper mantle beneath Italy and the surrounding area derived from the inversion of travel times of P and S waves from the updated International Seismological Centre (ISC) catalogue. Beneath Italy, we identify a high-velocity anomaly which has the appearance of a long, narrow "sausage" with a steeply dipping part down to a depth of 400 km and then expanding horizontally over approximately 400 km. Rather than to interpret it as a remnant of the former Tethyan oceanic slab, we consider that it is made up of the infra continental lithospheric mantle of Adria, which is progressively delaminated, whereas its overlying crust becomes progressively accreted into the Apenninic tectonic wedge.

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A new regional seismic tomography model of the upper mantle beneath Italy is presented. Here we identify a high-velocity anomaly, identifiable as a long, narrow sausage-shaped body with a steeply dipping part down to a depth of 400km and then expanding horizontally over ~400km. We propose that it could be made up of infra continental lithospheric mantle of Adria, which is progressively delaminated, whereas its overlying crust becomes progressively accreted into the Apenninic tectonic wedge.
A new regional seismic tomography model of the upper mantle beneath Italy is presented. Here we...
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