The Shackleton Fracture Zone represents the present-day boundary between the Antarctic and Scotia plates in the<br>Drake Passage. The West Scotia Ridge is an extinct spreading center, which formed the oceanic crust of the Scotia<br>Plate in this region and that intersects with the Shackleton Fracture Zone. New multichannel seismic, gravimetric,<br>magnetometric and multibeam swath bathymetry data were acquired during the ANTPAC 97/98 cruise with the Spanish<br>vessel B/O HESPERIDES in the area and reveal that these structures are asymmetric and developed as a consequence<br>of the overprinting of extensional and contractional deformation events. Thrusting of these young oceanic crusts<br>produces crustal thickening and shallow oceanic reliefs and ridges.


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