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., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more
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Document type: Summary
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| Keywords |
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]
Marine/Coastal |
| Author keywords |
Sediment waves; Mediterranean Outflow Water |
| Authors | | Top |
- Delivet, S., more
- Van Rooij, D., more
- Van Eetvelt, B., more
- Monteys, X.F.
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| 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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