Vertical zonation of bioturbation and mass movements in the Portimão Bank (Gulf of Cadiz, SW Iberia)
Authors
Roque, 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/s
Díaz-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)Date
2015-09Type
bookPartKeywords
bioturbationmagnetic fabric
landslide
Portimão Bank
Gulf of Cadiz
Abstract
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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