Tectonics and paleoceanography in the northern sector of the Antarctic Peninsula: Preliminary results of HESANT 1992/93 cruise with the B/O HESPERIDES

• Main Authors: Maldonado, Andrés, Aldaya, Florencio, Balanyá, Juan Carlos, Galindo Zaldívar, Jesús, Livermore, Roy, Monseñe, Francisco Miguel, Rodríguez-Fernández, José, Roussanov, Momtchil, Sanz de Galdeano, Carlos, Suriñach, Emma, Viseras, C.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Consejo Superior de Investigaciones Científicas (España) 1993
• Subjects: Tectonic; Paleoceanography; Antarctic Peninsula; Seismic stratigraphy; Tectónica; Paleoceanografía; Península Antártica; Estratigrafía sísmica; Antarctic; The Antarctic; Weddell Sea; Shackleton; Weddell; Límite; Shetland del Sur; South Scotia Ridge; Powell Basin; Shackleton Fracture Zone; South Shetland Trench; Antarc*; Antártica
• Online Access: http://hdl.handle.net/10261/28453

11 páginas, 7 figuras. [EN] The boundaries between the plates located in the northern sector of the Antarctic Peninsula were investigated during the B10 HESPERIDES HESANT 92/93 cruise using multichannel seismic profiles, magnetometry, and multibeam echo sounding. The investigation focused on the analysis of the tectonic relationships between the main lithospheric elements of the area and the paleoceanographic evolution of the continental margins and basins during the Upper Cenozoic. The triple junction defined by the southern end of the Shackleton Fracture Zone, the South Shetland Trench and the South Scotia Ridge shows a compressive structure where tectonic blocks and deep rooted diapirs develop. The boundary between the Scotia and Antarctic plates is characterized by a succession of structural highs, which represent continental crustal blocks, and intervening transtensive basins bounded by strike-slip faults. The Powell Basin and the continental margins of the Antarctic Peninsula in the Weddell Sea show several evolutionary styles which may represent an asymmetric opening of the basin and the relative importance of extensional and strikeslip faults in its development. [ES] Durante la campaña HESANT 92/03 con el B/O Hespérides, se han investigado con perfiles de sísmica multicanal, magnetometría y sondas multihaz, las relaciones geodinámicas en el límite de las placas situadas en la parte septentrional de la Península Antártica, así como la evolución paleoceanográfica de los márgenes continentales y cuencas de este sector durante el Cenozóico superior. La unión triple definida por la terminación meridional de la Zona de Fractura Shackleton, la fosa de las Shetland del Sur y la dorsal meridional del Mar de Scotia muestra una estructura compresiva, con el desarrollo de bloques y diapiros profundamente enraizados en la corteza. El límite entre las placas de Scotia y Antártica está ocupado por una alternancia de altos estructurales, correspondientes a fragmentos de corteza continental, y cuencas transtensivas ...