Ionian Abyssal Plain: A window into the Tethys oceanic lithosphere

Type Article
Date 2019-04
Language English
Author(s) Dannowski Anke1, Kopp Heidrun1, 2, Klingelhoefer FraukeORCID3, Klaeschen Dirk1, Gutscher Marc-Andre4, Krabbenhoeft Anne1, Dellong David3, 4, Rovere Mickael5, Graindorge David6, Papenberg Cord1, Klaucke Ingo1
Affiliation(s) 1 : Dynamics of the Ocean Floor, GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, 24148, Germany
2 : Department of Geosciences, Kiel University, Kiel, 24118, Germany
3 : Géosciences Marines, Ifremer, Centre de Brest, Plouzané, 29280, France
4 : Laboratoire Géosciences Océan, IUEM, Université Brest, CNRS, Plouzané, 29280, France
5 : Institute of Marine Sciences National Research Council, ISMAR – CNR, Bologna, 40129, Italy
6 : Laboratoire Géosciences Océan, IUEM, Université Brest, CNRS, Plouzané, 29280, France
Source Solid Earth (1869-9510) (Copernicus GmbH), 2019-04 , Vol. 10 , N. 2 , P. 447-462
DOI 10.5194/se-10-447-2019
WOS© Times Cited 3
Abstract

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. To univocally confirm the proposed oceanic nature of the IAP crust as a remnant of the Tethys ocean and to confute its interpretation as a strongly thinned part of the African continental crust, a NE-SW oriented 131 km long seismic refraction and wide-angle reflection profile consisting of eight ocean bottom seismometers and hydrophones was acquired in 2014. 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 6km thick crust with velocities ranging from 5.1km/s to 7.2km/s, 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 9km and seismic velocities decrease to 6.8km/s 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 oceanic lithosphere formed during the Permian and Triassic period.

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Dannowski Anke, Kopp Heidrun, Klingelhoefer Frauke, Klaeschen Dirk, Gutscher Marc-Andre, Krabbenhoeft Anne, Dellong David, Rovere Mickael, Graindorge David, Papenberg Cord, Klaucke Ingo (2019). Ionian Abyssal Plain: A window into the Tethys oceanic lithosphere. Solid Earth, 10(2), 447-462. Publisher's official version : https://doi.org/10.5194/se-10-447-2019 , Open Access version : https://archimer.ifremer.fr/doc/00473/58431/