Crustal structure of the Ionian basin and eastern Sicily margin: results from a wide-angle seismic survey.

Type Article
Date 2018-03
Language English
Author(s) Dellong David1, 2, Klingelhoefer FraukeORCID2, Kopp Heidrun3, Graindorge David1, Margheriti LuciaORCID4, Moretti MilenaORCID4, Murphy ShaneORCID2, Gutscher Marc-Andre1
Affiliation(s) 1 : Univ Brest, CNRS, Lab Geosci Ocean, IUEM, Plouzane, France.
2 : IFREMER, Ctr Brest, Geosci Marines, Plouzane, France.
3 : Geomar Helmholtz Ctr Ocean Res, Kiel, Germany.
4 : Ist Nazl Geofis & Vulcanol, Rome, Italy.
Source Journal Of Geophysical Research-solid Earth (2169-9313) (Amer Geophysical Union), 2018-03 , Vol. 123 , N. 3 , P. 2090-2114
DOI 10.1002/2017JB015312
WOS© Times Cited 37
Keyword(s) Ionian basin, crustal structure, wide-angle seismic, geodynamic, Mediterranean, Malta Escarpment

In the Ionian Sea (Central Mediterranean) the slow convergence between Africa and Eurasia results in the formation of a narrow subduction zone. The nature of the crust of the subducting plate remains debated and could represent the last remnants of the Neo-Tethys ocean. The origin of the Ionian basin is also under discussion, especially concerning the rifting mechanisms as the Malta Escarpment could represent a remnant of this opening. This subduction retreat toward the south-east (motion occurring since the last 35 Ma) but is confined to the narrow Ionian Basin. A major lateral slab tear fault is required to accommodate the slab roll-back. This fault is thought to propagate along the eastern Sicily margin but its precise location remains controversial.

This study focuses on the deep crustal structure of the Eastern-Sicily margin and the Malta Escarpment. We present two two-dimensional P-wave velocity models obtained from forward modeling of wide-angle seismic data acquired onboard the R/V Meteor during the DIONYSUS cruise in 2014.

The results image an oceanic crust within the Ionian basin as well as the deep structure of the Malta Escarpment, which presents characteristics of a transform margin. A deep and asymmetrical sedimentary basin is imaged south of the Messina strait and seems to have opened between the Calabrian and Peloritan continental terranes. The interpretation of the velocity models suggests that the tear fault is located east of the Malta Escarpment, along the Alfeo fault system (AFS).

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Dellong David, Klingelhoefer Frauke, Kopp Heidrun, Graindorge David, Margheriti Lucia, Moretti Milena, Murphy Shane, Gutscher Marc-Andre (2018). Crustal structure of the Ionian basin and eastern Sicily margin: results from a wide-angle seismic survey. Journal Of Geophysical Research-solid Earth, 123(3), 2090-2114. Publisher's official version : , Open Access version :