GEBRA-MAGIA Complex. Recent Mass-transport processes affecting the central Bransfield basin (Antarctica)

• Main Authors: Casas, David, García, M., Bohoyo, Fernando, Maldonado, Andrés, Ercilla, Gemma
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Sociedad Geológica de España 2016
• Subjects: Antarctic Peninsula; morphosedimentary features; submarine mass movements; Península Antártica; Antarctic; The Antarctic; Antarc*; Antarctica; Antártica; Antártida
• Online Access: http://hdl.handle.net/10261/276968

IX Congreso Geológico de España, 12-14 septiembre 2016, Huelva.-- 4 pages, 4 figures. [EN] The GEBRA-MAGIA complex is an important example of submarine mass-movement located in the lower continental slope of the the Central Bransfield Basin (CBB) in the Antarctic Peninsula. Based on the identification of the main features, repeated slope failures are inferred to have affected the area configuring the GEBRA-MAGIA complex. It is therefore classified as a mass-movement composite that has contributed to the outbuilding of the lower continental slope by merging different mass-transport deposits. This complex is composed of the GEBRA valley to the east and an irregular area to the west (MAGIA area) where numerous instability features affect the seafloor. The GEBRA valley has been defined as a Quaternary Debris valley formed as a result of repeated large-scale mass transport processes. This evolution has determined its striking relief and the architecture of this part of the continental slope. Although sedimentary instabilities are also the main processes, in the case of the adjacent area of MAGIA, the resulting sedimentary architecture and morphology are completely different. The new data recorded in the poorly known area of MAGIA allowed defining the occurrence of flows intercalated with mass transport of diverse magnitude as the main recent processes along the whole GEBRAMAGIA complex. [ES] El complejo GEBRA-MAGIA es un significativo ejemplo de procesos de inestabilidad sedimentaria submarina que se localiza en el talud continental inferior de la Península Antártica, en la Cuenca de Bransfield central (CBB). La identificación de sus principales características morfosedimentarias, permite inferir que el complejo GEBRA-MAGIA ha sido configurado por la combinación de diferentes depósitos de transporte en masa que se han repetido a través del tiempo contribuyendo a la evolución del talud continental. El valle GEBRA se ha definido como un valle Cuaternario formado como resultado de repetidos procesos de inestabilidad ...