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Deep structure of the Southern Apennines as imaged by active and passive seismic data along the CROP-04 (crustal) reflection seismic profile

View ORCID ProfileL. Savastano and View ORCID ProfileN. Piana Agostinetti
Journal of the Geological Society, 176, 1284-1290, 11 July 2019, https://doi.org/10.1144/jgs2018-201
L. Savastano
1Institute of Applied Geoscience, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
Roles: [Conceptualization (Equal)], [Data curation (Equal)], [Methodology (Supporting)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Supporting)>
  • Find this author on Google Scholar
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  • ORCID record for L. Savastano
  • For correspondence: eelsa@leeds.ac.uk
N. Piana Agostinetti
2Department of Geodynamics and Sedimentology, University of Vienna, Althanstraße 14, 1090 Vienna, Austria
3Centro Nazionale Terremoti, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Roles: [Conceptualization (Equal)], [Data curation (Equal)], [Methodology (Lead)], [Writing - Original Draft (Equal)], [Writing - Review & Editing (Equal)
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Abstract

We combine active and passive seismic data to reconstruct a coherent picture of the deep crust beneath the Southern Apennines orogen. The Southern Apennines collisional setting is characterized by deep structural complexities, which have been here investigated through different seismic data from both active and passive surveys. Several geological reconstructions have been carried out in the last two decades to interpret the detected substructures, but failed to provide a univocal interpretation of the Apennine roots. At present, strong disagreements exist among geologists about the tectonic style of the chain in that portion of the Italian peninsula. In this study, we first combine five passive seismic datasets from the overall available literature and we then project them at relative depths on a co-located active seismic profile (CROP-04). The general aim of the study is to shed light on the Southern Apennines structure at depths greater than 25 km, where, through the adopted approach, an approximate shape of the lower crust and upper mantle structure can be delineated. Our results indicate the following: (1) during the Adriatic slab retreat, the crust along the Tyrrhenian margin was only marginally thinned (Moho depth about 28–30 km), much less than along the Tyrrhenian coast of the Northern Apennines and Calabria (where Moho depth has been found at 20–25 km); (2) the subduction process has locally been stationary for a long time, leading to the complete eclogitization of the subducted crust and total regeneration of the Tyrrhenian Moho; (3) subduction fluids underwent a complete migration out of the mantle wedge, as testified by the high velocities found in the upper mantle below the Moho in the Tyrrhenian region (observed nowhere else in the Apennine subduction setting).

Thematic collection: This article is part of the ‘Apennines and Tyrrhenian system’ collection available at: https://www.lyellcollection.org/cc/the-apennines-tyrrhenian-system

  • © 2019 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 176 (6)
Journal of the Geological Society
Volume 176, Issue 6
November 2019
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Deep structure of the Southern Apennines as imaged by active and passive seismic data along the CROP-04 (crustal) reflection seismic profile

L. Savastano and N. Piana Agostinetti
Journal of the Geological Society, 176, 1284-1290, 11 July 2019, https://doi.org/10.1144/jgs2018-201
L. Savastano
1Institute of Applied Geoscience, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
Roles: [Conceptualization (Equal)], [Data curation (Equal)], [Methodology (Supporting)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Supporting)>
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for L. Savastano
  • For correspondence: eelsa@leeds.ac.uk
N. Piana Agostinetti
2Department of Geodynamics and Sedimentology, University of Vienna, Althanstraße 14, 1090 Vienna, Austria
3Centro Nazionale Terremoti, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Roles: [Conceptualization (Equal)], [Data curation (Equal)], [Methodology (Lead)], [Writing - Original Draft (Equal)], [Writing - Review & Editing (Equal)
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for N. Piana Agostinetti

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Deep structure of the Southern Apennines as imaged by active and passive seismic data along the CROP-04 (crustal) reflection seismic profile

L. Savastano and N. Piana Agostinetti
Journal of the Geological Society, 176, 1284-1290, 11 July 2019, https://doi.org/10.1144/jgs2018-201
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