4/9/2023 0 Comments Hesperides antartidaBAS (misc) 3, Cambridge.Ĭanals, M, Acosta, J, Gracia, E, Escartin, J, and ORCA Group.: 1992, Caracterización Geológica de la región de enlace entre la cuenca de Bransfield y la dorsal sur de Scotia (Antártida)’. British Antarctic Survey Scientific Reports 78, 81 pp.īritish Antarctic Survey: 1985, ‘Tectonic Map of the Scotia Arc’. and Roobol, M.J.: 1975, ‘The geology of the South Shetland Islands: V. Tingey (Ed.), Antarctic Geology, Oxford University Press, Oxford, 215–248.īaker, P.E., McReath, I., Harvey, M.R. and Storey, B.C.: 1991, ‘Tectonic development of the Scotia Arc region’. and King, E.C.: 1984, ‘An early Miocene ridge crest-trench collision on the South Scotia Ridge near 36° W’. American Geophysical Union Geodynamics Series, 9, 137–170.īarker, P.F, Barber, P.L. (Ed.), Geodynamics of the Eastern Pacific Region, Caribbean and Scotia Arcs. and Dalziel, I.W.D.: 1983, ‘Progress in geodynamics in the Scotia arc region’. and Burrell, J.: 1977, ‘The opening of Drake Passage’. IAVCEI Special Series, Santiago, Chile, 330–346.īarker, P.F.: 1982, ‘The Cenozoic subduction history of the Pacific margin of the Antarctic Peninsula: ridge crest-trench intercations’. González-Ferrán (Ed.), Symposium on Andean and Antarctic Volcanology Problems. ‘The tectonic framework in the Cenozoic volcanism in the Scotia Sea region, a review’. 66, 1328–1347.īarker, D.H.N, and Austin, J.A., Jr.: 1994, ‘Crustal diapirism in Bransfield Strait, west Antarctica - evidence for distributed extension in marginal basin formation’. ‘Continental - oceanic crustal transitionm off Southwest Africa’. Geologic Evolution of Atlantic Continental Rises New York, Van Nostrand Reinhold, 49–61.Īshcroft, W.A.: 1972‘, ’Crustal structure of the South Shetland Islands and Bransfield Strait’ British Antarctic Survey scientific Report 66,1–43.Īllen, A.: 1966, ‘Seismic refraction investigations in the Scotia Sea”’ British Antarctic Survey Scientific Reports, 55, 1–44.Īustin, J.A. and Uchupi, E.: 1992, ‘Antarctic continental margin: Bransfield Trough, An Incipient Ocean Basin’. and Sastre, J.C.: 1989c, ‘Anomalias magnéticas al sur del mar de Bransfield’. Canals, M., Diez, J.L., Fernandez Lopez, J.M., Herranz, P., Ortiz, R. Oceanografia (2), 9–82.Īcosta, J., Canals, M., Harranz, P., and Sanz, J.L.: 1989b ‘Perfiles sísmicos en la Shetlands del sur y estrecho de Bransfield. Resultados de la Campaña ’ANTARTIDA 8611”. and Sanz, J.L.: 1989a, ‘Investigación geológica y geofisica en el Arco de Scotia y Penínsulas Antártica. This process is experimental and the keywords may be updated as the learning algorithm improves.Īcosta, J., Canals, M., Herranz, P. These keywords were added by machine and not by the authors. This smooth surface could represent the top of a sequence of volcanics and sediments resting on oceanic crust. Except for a few local swells the basement surface lacks the relief typical of oceanic basement which is found in the Scotia Sea. This basin located within the Antarctic plate was formed by back-arc spreading shortly before the collision of a spreading axis with a trench east of Jane Bank about 20 Ma. On two of the three profiles crossing of the South Scotia Ridge boundary there is evidence of compression due to local convergence along the Scotia-Antarctic plate boundary. The surface of the crust is quite rough and in places it displays sub-crustal reflections. This structural province, north of the South Scotia Ridge has an oceanic crust. It consists of continental crustal fragments transported eastward from their original position along the South America-Antarctic isthmus during the opening of Drake Passage about 29 Ma ago. South Scotia Ridge, a chain of highs and depressions along the boundary between the Scotia and Antarctic plates. It was formed either by a combination of continental rifting and back-arc sea-floor spreading and the volcanic chain along its axis represents a poorly organized spreading axis or by continental extension due either to a 110 º bend in the Scotia-Antarctic plate boundary in the vicinity of Clarence Island or to complex plate interactions in the northern Antarctic Peninsula. Bransfield Trough, a half-graben in the back of the South Shetland trench/island arc with the master fault on the Antarctic Peninsula side and a chain of volcanic structures along its axis. These provinces which differ in structural style and crustal character include: A total of 1.500 km of multichannel seismic reflection profiles recorded aboard B/O Hesperides using a seven gun array and a 96 channel streamer during the austral summer of 1991-1992 were used to study four structural provinces on the Antarctic and Scotia plates.
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