Oceanographic processes and morphosedimentary products along the Iberian margins: A new multidisciplinary approach

F. Javier Hernández-Molina, Anna Wåhlin, Miguel Bruno, Gemma Ercilla, Gemma Ercilla, Nuno Serra, Gabriel Rosón, Pere Puig, Michele Rebesco, David Van Rooij, David Roque, César González-Pola, Francisco Sánchez, María Gómez, Benedict Preu, Tilmann Schwenk, Till J. J. Hanebuth, Ricardo F. Sánchez Leal, Jesús García-Lafuente, Rachel BrackenridgeCarmen Juan, Dorrik A. V. Stow, José María Sánchez-González

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Our understanding of bottom-currents and associated oceanographic processes (e.g., overflows, barotropic tidal currents) including intermittent processes (e.g., vertical eddies, deep sea storms, horizontal vortices, internal waves and tsunamis) is rapidly evolving. Many deep-water processes remain poorly understood due to limited direct observations, but can generate significant depositional and erosional features on both short and long term time scales. This paper represents a review work, which describes for the first time these oceanographic processes and examines their potential role in the sedimentary features along the Iberian continental margins. This review explores the implications of the studied processes, given their secondary role relative to other factors such as mass-transport and turbiditic processes, and highlights three major results: a) contourite depositional and erosional features are ubiquitous along the margins, indicating that bottom currents and associated oceanographic processes control the physiography and sedimentation; b) the position of interfaces between major water masses and their vertical and spatial variation in time specifically appears to exert primary control in determining major morphologic changes along the slope gradient, including the contourite terraces development; and c) contourites deposits exhibit greater variation than the established facies model suggests. Therefore, a consistent facies model however faces substantial challenges in terms of the wide range of oceanographic processes that can influence in their development. An integrated interpretation of these oceanographic processes requires an understanding of contourites, seafloor features, their spatial and temporal evolution, and the near-bottom flows that form them. This approach will synthesize oceanographic data, seafloor morphology, sediments and seismic images to improve our knowledge of permanent and intermittent processes around Iberia, and evaluate their conceptual and regional role in the margin's sedimentary evolution. Given their complexes, three-dimensional and temporally-variable nature, integration of these processes into sedimentary, oceanographic and climatological frameworks will require a multidisciplinary approach that includes Geology, Physical oceanography, Paleoceanography and Benthic Biology.

Original languageEnglish
Pages (from-to)127–156
Number of pages30
JournalMarine Geology
Volume378
Early online date20 Dec 2015
DOIs
Publication statusPublished - 1 Aug 2016

Keywords

  • Bottom currents
  • Contourites
  • Iberian margins
  • Oceanographic processes
  • Sedimentary processes

ASJC Scopus subject areas

  • Oceanography
  • Geochemistry and Petrology
  • Geology

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    Hernández-Molina, F. J., Wåhlin, A., Bruno, M., Ercilla, G., Ercilla, G., Serra, N., Rosón, G., Puig, P., Rebesco, M., Van Rooij, D., Roque, D., González-Pola, C., Sánchez, F., Gómez, M., Preu, B., Schwenk, T., Hanebuth, T. J. J., Sánchez Leal, R. F., García-Lafuente, J., ... Sánchez-González, J. M. (2016). Oceanographic processes and morphosedimentary products along the Iberian margins: A new multidisciplinary approach. Marine Geology, 378, 127–156. https://doi.org/10.1016/j.margeo.2015.12.008