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Deep Crustal Structure Of The Area Of Intersection Between The Shackleton Fracture Zone And The West Scotia Ridge (Drake Passage, Antarctica)Normal access

Authors: A. Maldonado, J. Galindo-Zaldívar, A. Jabaloy, J.M. Martínez-Martínez, C.S. de Galdeano, L. Somoza and E. Surinach
Event name: 6th International Congress of the Brazilian Geophysical Society
Session: Marine Geophysics
Publication date: 15 August 1999
Organisations: SBGf
Language: English
Info: Extended abstract, PDF ( 189.35Kb )

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

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