FN Archimer Export Format PT J TI Tectonic inheritance and Pliocene-Pleistocene inversion of the Algerian margin around Algiers: Insights from multibeam and seismic reflection data BT AF STRZERZYNSKI, Pierre DEVERCHERE, Jacques CATTANEO, Antonio DOMZIG, Anne YELLES, Karim DE LEPINAY, Bernard Mercier BABONNEAU, Nathalie BOUDIAF, Azzedine AS 1:1,2;2:1,2;3:3;4:4;5:5;6:6;7:1,2;8:5; FF 1:;2:;3:PDG-DOP-DCB-GM-LES;4:;5:;6:;7:;8:; C1 Univ Europeenne Bretagne, Brest, France. Univ Brest Occidentale, IUEM, CNRS, UMR 6538, F-29280 Plouzane, France. IFREMER, Dept Marine Geosci, Lab Environm Sedimentaires, F-29280 Plouzane, France. Midland Valley Explorat Ltd, Glasgow G2 2HG, Lanark, Scotland. CRAAG, Algiers 16340, Algeria. Univ Nice Sophia Antipolis, CNRS, UMR 6526, F-06560 Valbonne, France. C2 UEB, FRANCE UBO, FRANCE IFREMER, FRANCE MIDLAND VALLEY EXPLORAT LTD, UK CRAAG, ALGERIA UNIV NICE, FRANCE SI BREST SE IUEM PDG-DOP-DCB-GM-LES IN WOS Ifremer jusqu'en 2018 copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe copubli-sud IF 3.147 TC 34 UR https://archimer.ifremer.fr/doc/00008/11883/9286.pdf https://archimer.ifremer.fr/doc/00008/11883/9287.pdf LA English DT Article CR MARADJA MARADJA/2 SAMRA BO Le SuroƮt DE ;messinian salinity crisis;western mediterranean sea;northern algeria;intraplate deformation;incipient subduction;plate kinematics;salt tectonics;boundary;basin;miocene AB The Algerian margin has originated from the opening of the Algerian basin about 25-30 Ma ago. The central margin provides evidence for large-scale normal faults of Oligo-Miocene age, whereas transcurrent tectonics characterizes the western margin. A set of NW-SE oriented dextral transform faults was active during basin opening and divided the 600 km long central margin into segments of similar to 120-150 km. The upper Miocene, Plio-Quaternary, and present-day tectonic setting is, however, compressional and supports the occurrence of a margin inversion, a process still poorly documented worldwide. We show that the central Algerian margin represents a rare example of inverted margin, where the process of subduction inception is particularly well expressed and helps understand how extensional and transtensive structures are involved in margin shortening. Using multibeam bathymetry and multichannel seismic reflection sections from the MAR-ADJA 2003 and 2005 cruises, we evidence Pliocene-Pleistocene shortening with contrasting styles along the margin between west (Khayr Al Din bank) and east (Boumerdes-Dellys margin) of Algiers. Pre-Miocene structures such as basement highs and transform faults appear to control changes of the deformation pattern along this part of the margin, resulting in different widths, geometries, and relative positions of folds and faults. Plio-Quaternary and active blind thrust faults do not reuse Oligo-Miocene normal and transform faults during inversion, but instead grow within the continental margin (as testified for instance by the 21 May 2003 M-w 6.8 Boumerdes-Zemmouri earthquake), at the foot of the continental slope and at the northern sides of basement highs interpreted as stretched continental blocks of the rifted margin. The inherited structures of the margin appear, therefore, to determine this deformation pattern and ultimately the earthquake and tsunami sizes offshore. The complex geometry of the fault system along the Algerian margin suggests a process of initiation of subduction in its central and eastern parts. PY 2010 PD MAR SO Tectonics SN 0278-7407 PU Amer Geophysical Union VL 29 IS TC2008 UT 000278233200001 BP 1 EP 22 DI 10.1029/2009TC002547 ID 11883 ER EF