Ionian Abyssal Plain: a window into the Tethys oceanic lithosphere

Autor: Anke Dannowski, Heidrun Kopp, Frauke Klingelhoefer, Dirk Klaeschen, Marc-André Gutscher, Anne Krabbenhoeft, David Dellong, Marzia Rovere, David Graindorge, Cord Papenberg, Ingo Klaucke
Přispěvatelé: Helmholtz Centre for Ocean Research [Kiel] (GEOMAR), Unité de recherche Géosciences Marines (Ifremer) (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire Géosciences Océan (LGO), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Istituto di Science Marine (ISMAR ), Consiglio Nazionale delle Ricerche (CNR), Géosciences Marines (GM), Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Solid Earth
Solid Earth, European Geosciences Union, 2019, 10 (2), pp.447-462. ⟨10.5194/se-10-447-2019⟩
[Poster] In: EGU General Assembly 2019, 08.-13.04.2019, Vienna, Austria .
Solid Earth, 2019, 10 (2), pp.447-462. ⟨10.5194/se-10-447-2019⟩
Solid Earth (1869-9510) (Copernicus GmbH), 2019-04, Vol. 10, N. 2, P. 447-462
Solid Earth, 10 (2). pp. 447-462.
[Poster] In: 79. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG), 5.3.-8.3.2019, Braunschweig, Germany .
ISSN: 1869-9529
1869-9510
DOI: 10.5194/se-10-447-2019⟩
Popis: The nature of the Ionian Sea crust has been the subject of scientific debate for more than 30 years, mainly because seismic imaging of the deep crust and upper mantle of the Ionian Abyssal Plain (IAP) has not been conclusive to date. The IAP is sandwiched between the Calabrian and Hellenic subduction zones in the central Mediterranean. A NNE–SSW-oriented 131 km long seismic refraction and wide-angle reflection profile, consisting of eight ocean bottom seismometers and hydrophones, was acquired in 2014. The profile was designed to univocally confirm the proposed oceanic nature of the IAP crust as a remnant of the Tethys and to confute its interpretation as a strongly thinned part of the African continental crust. A P-wave velocity model developed from travel-time forward modelling is refined by gravimetric data and synthetic modelling of the seismic data. A roughly 6–7 km thick crust with velocities ranging from 5.1 to 7.2 km s−1, top to bottom, can be traced throughout the IAP. In the vicinity of the Medina seamounts at the southern IAP boundary, the crust thickens to about 9 km and seismic velocities decrease to 6.8 km s−1 at the crust–mantle boundary. The seismic velocity distribution and depth of the crust–mantle boundary in the IAP document its oceanic nature and support the interpretation of the IAP as a remnant of the Tethys lithosphere with the Malta Escarpment as a transform margin and a Tethys opening in the NNW–SSE direction.
Databáze: OpenAIRE
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