Numerical modelling of opposing subduction in the Western Mediterranean

The geodynamic evolution of the Western Mediterranean related to closure Ligurian-Tethys ocean is not yet fully resolved. We present a new 3D numerical model double subduction with opposite polarities fostered by inherited segmentation margins and rifting system between Iberia NW Africa. constrained plate kinematic reconstructions assumes that both Alboran-Tethys Algerian-Tethys segments are separated NW-SE transform zone enabling polarity changes from SE-dipping in segment NW-dipping segment. starts about late Eocene times at 36.5 Ma temporal simulation tied geological comparing rates convergence trench retreat, onset end opening Alboran Basin. Curvature slab imposed pinning its western edge when reaching adjacent west-Africa continental block. progressive curvature explains observed regional stress reorientation changing N-S E -W central regions increase retreat slabs compatible west-to-east transition continental-to-magmatic-to-oceanic crustal nature massive partially synchronous calc-alkaline alkaline magmatism. • propose opposing simulating tectonic setting Mediterranean. consistent duration Algerian basins.