FN Archimer Export Format PT J TI Ionian Abyssal Plain: A window into the Tethys oceanic lithosphere BT AF Dannowski, Anke Kopp, Heidrun Klingelhoefer, Frauke Klaeschen, Dirk Gutscher, Marc-Andre Krabbenhoeft, Anne Dellong, David Rovere, Mickael Graindorge, David Papenberg, Cord Klaucke, Ingo AS 1:1;2:1,2;3:3;4:1;5:4;6:1;7:3,4;8:5;9:6;10:1;11:1; FF 1:;2:;3:PDG-REM-GM-LAD;4:;5:;6:;7:PDG-REM-GM-LAD;8:PDG-REM-GM-LGS;9:;10:;11:; C1 Dynamics of the Ocean Floor, GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, 24148, Germany Department of Geosciences, Kiel University, Kiel, 24118, Germany Géosciences Marines, Ifremer, Centre de Brest, Plouzané, 29280, France Laboratoire Géosciences Océan, IUEM, Université Brest, CNRS, Plouzané, 29280, France Institute of Marine Sciences National Research Council, ISMAR – CNR, Bologna, 40129, Italy Laboratoire Géosciences Océan, IUEM, Université Brest, CNRS, Plouzané, 29280, France C2 IFM GEOMAR, GERMANY UNIV KIEL, GERMANY IFREMER, FRANCE CNRS, FRANCE CNR ISMAR, ITALY UBO, FRANCE SI BREST SE PDG-REM-GM-LAD PDG-REM-GM-LGS UM LGO IN WOS Ifremer UPR DOAJ copubli-france copubli-europe copubli-univ-france IF 2.921 TC 21 UR https://archimer.ifremer.fr/doc/00473/58431/61006.pdf https://archimer.ifremer.fr/doc/00473/58431/63456.pdf LA English DT Article AB 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. PY 2019 PD APR SO Solid Earth SN 1869-9510 PU Copernicus GmbH VL 10 IS 2 UT 000463352400001 BP 447 EP 462 DI 10.5194/se-10-447-2019 ID 58431 ER EF