Data/hora: 05/06/2024 01:02:43

Provedor de dados: | 5
País: | France
Título: | Crustal structure of the Ionian basin and eastern Sicily margin: results from a wide-angle seismic survey.
Autores: | Dellong, David; Klingelhoefer, Frauke; Kopp, Heidrun; Graindorge, David; Margheriti, Lucia; Moretti, Milena; Murphy, Shane; Gutscher, Marc-andre.
Data: | 2018-03
Ano: | 2018
Palavras-chave: | Ionian basin; Crustal structure; Wide-angle seismic; Geodynamic; Mediterranean; Malta Escarpment.
Resumo: | 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).
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00427/53885/54956.pdf

https://archimer.ifremer.fr/doc/00427/53885/54957.pdf

DOI:10.1002/2017JB015312

https://archimer.ifremer.fr/doc/00427/53885/

Editor: | Amer Geophysical Union
Formato: | application/pdf
Fonte: | Journal Of Geophysical Research-solid Earth (2169-9313) (Amer Geophysical Union), 2018-03 , Vol. 123 , N. 3 , P. 2090-2114

Fonte:

2018 American Geophysical Union. All rights reserved.

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