Subduction or delamination beneath the Apennines? Evidence from regional tomography

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Abstract

In this study we present a new regional tomography model of the upper mantle beneath Italy and surrounding areas derived from inversion of travel times of <i>P</i> and <i>S</i> waves from the updated ISC catalogue. Beneath Italy we identify a high-velocity anomaly which behaves as 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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Koulakov, I., Jakovlev, A., Zabelina, I., Roure, F., Cloetingh, S., El Khrepy, S., & Al-Arifi, N. (2015). Subduction or delamination beneath the Apennines? Evidence from regional tomography. Solid Earth, 6(2), 669–679. https://doi.org/10.5194/se-6-669-2015

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