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Seismic geomorphological reconstructions at Goban Spur: Implications for Plio-Pleistocene MOW bottom current variability
Delivet, S.; Van Rooij, D.; Van Eetvelt, B.; Monteys, X.F. (2014). Seismic geomorphological reconstructions at Goban Spur: Implications for Plio-Pleistocene MOW bottom current variability, in: Van Rooij, D. et al. (Ed.) Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69: pp. 55-56
In: Van Rooij, D.; Rüggeberg, A. (Ed.) (2014). Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69. Ghent University, Department of Geology and Soil Science/Flanders Marine Institute (VLIZ): Oostende. xviii, 152 pp., meer
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, meer

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Documenttype: Samenvatting

Trefwoorden
    Geological time > Phanerozoic > Geological time > Cenozoic > Quaternary > Pleistocene
    Geological time > Phanerozoic > Geological time > Cenozoic > Tertiary > Cenozoic > Neogene > Pliocene
    Motion > Water motion > Water currents > Bottom currents
    ANE, Goban Spur [Marine Regions]
    Marien
Author keywords
    Sediment waves; Mediterranean Outflow Water

Auteurs  Top 
  • Delivet, S., meer
  • Van Rooij, D., meer
  • Van Eetvelt, B., meer
  • Monteys, X.F.

Abstract
    DSDP Site 548 on Goban Spur has been investigated using high-resolution single channel sparker reflection seismic data. Alongslope bottom currents are thought to be the driving mechanism for large-scale sediment waves development. These currents are driven on their turn by an enhanced internal tide regime that could be attributed to the MOW introduction, which characterized the presence of a strong pycnal gradient. The integration of the seismic stratigraphy with the DSDP Site 548 downhole geophysical data allowed the proposition of a better chronostratigraphic and lithostratigraphic correlation. The early to late Pliocene sequence (from ~4.2 to ~2.7Ma) shows no morphological evidence of bottom current driven sedimentation. However, from the late Pliocene (i.e. ~2.7Ma) to present, large-scale sediment waves have gradually developed in close association with palaeo-seafloor irregularities, inferring that sedimentation resumed with a marked large bottom current energy increase. The late Pliocene and the middle Pleistocene units contain mass wasting intervals. Although the Goban Spur sediment waves cannot be regarded as a contourite drift as such, the stratigraphic evolution shows striking similarities to well-documented MOW induced contourite drift systems along the northeast Atlantic margin, more especially as an intermediate site between le Danois bank and the Porcupine Seabight.

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