Vertical zonation of bioturbation and mass movements in the Portimão Bank (Gulf of Cadiz, SW Iberia)
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AuthorsRoque, C.; Silva, P.F.; Drago, T.; Lopes, A.; Alonso, B.; Vázquez, J.T. (Juan Tomás); Casas, D.; López-González, N. (Nieves); Ercilla, G.; Neres, M.
Editor/sDíaz-del-Río-Español, V. (Víctor); Bárcenas, P.; Fernández-Salas, L.M. (Luis Miguel); López-González, N. (Nieves); Palomino, D. (Desirée); Rueda, J.L. (José Luis); Sánchez-Guillamón, O. (Olga); Vázquez, J.T. (Juan Tomás)
Gulf of Cadiz
This work presents results from bioturbation intensity and trace fossil analysis of the piston core PC07, recovered at Portimão Bank during the MONTERA cruise in 2012. The aim was to investigate the potential of bioturbation analysis as an indicator for mass movement events. Bioturbation and trace fossil identification was complemented with results from sedimentological analysis (grain-size, carbonates, organic matter), measurements of magnetic fabric parameters (mass magnetic susceptibility and anisotropy of magnetic susceptibility), and AMS 14C dating. Considering the vertical zonation of bioturbation, magnetic fabric changes, sedimentology and AMS radiocarbon dating, two intervals were identified, Interval A (0-180 cm) and Interval B (180-356 cm), being the limit between them placed at 180-181cm. These intervals seem to replicate almost the same vertical zonation of bioturbation and the trend of carbonates and organic matter changes downcore. The magnetic fabric parameters ...
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