Ionian Abyssal Plain: A window into the Tethys oceanic lithosphere.

Dannowski, Anke , Kopp, Heidrun , Klingelhoefer, Frauke, Klaeschen, Dirk , Gutscher, Marc-Andre, Krabbenhoeft, Anne, Dellong, David , Rovere, Marzia, Graindorge, David, Papenberg, Cord and Klaucke, Ingo (2019) Ionian Abyssal Plain: A window into the Tethys oceanic lithosphere. Open Access Solid Earth, 10 (2). pp. 447-462. DOI 10.5194/se-10-447-2019.

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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.

Document Type: Article
Keywords: Central Mediterranean, Continental crusts, Hellenic subduction zone, Ocean bottom seismometer, Seismic refraction, Seismic velocities, Tethys oceanic lithospheres, Wide-angle reflection
Research affiliation: IFREMER
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/se-10-447-2019
ISSN: 1869-9529
Date Deposited: 13 Dec 2018 14:03
Last Modified: 08 Feb 2021 07:28

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