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

• Main Authors: Casas Layola, David, García, M., Bohoyo Muñoz, Fernando, Maldonado, Andrés, Ercilla, Gemma
• Format: Other/Unknown Material
• Language: English
• Published: Sociedad Geológica de España 2020
• Subjects: Antarctic Peninsula; morphosedimentary features; submarine mass movements; Península Antártica; Antarctic; The Antarctic; Antarc*; Antarctica; Antártica; Antártida
• Online Access: https://hdl.handle.net/20.500.12468/609

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. Instituto Geológico y Minero de España, España Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas, España Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada, España Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas, España