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Contourites drifts and cold-water coral mounds in the Atlantic Moroccan coral province : origin, evolution and driving factors

Thomas Vandorpe UGent (2017)
abstract
Research highlights: - Topographic obstacles have a profound effect on sedimentation patterns. When bottom currents encounter topographic obstacles, they focus and intensify, leading to sediment drifts at the base. Along the tectonic ridges of the Atlantic Moroccan margin, 11° is the threshold for sediment drift formation, while along the mud volcanoes, sediment drifts are present at the southern and/or northern side and are related to the size of the mud volcano. - Internal tides play an important role in the build-up of sediment drifts. Although the sediment drifts along the Atlantic Moroccan margin were mainly driven by glacial water masses, internal tidal currents play an important role in their development. They are driving long-term bottom currents and consequently influence sediment drift deposition along the tectonic ridges and mud volcanoes. Sediment drifts created or influenced by internal tidal currents could be named tidal sediment drifts and a limited extent is proposed. - Coral mound build-up is related to climatic changes and interferes with its immediate surroundings. The Atlantic Moroccan coral province is the largest discovered coral mound province in the world so far and possesses stratigraphic evidence, 10 different initiation horizons in the subsurface, of climate-dependant growth cycles of cold-water corals. Small-scale sediment drifts are created around some of the coral mounds, evidencing deviated and intensified bottom currents. This creates elevated fluxes of food particles and sediment towards the corals, allowing proliferation. - Diagnostic criteria for contourites could be developed based on CT analyses of sediment cores. A workflow for analysing CT-scans, based on the grey values within the radiographs, of sediment cores has been developed which can aid in the discovery of diagnostic criteria to distinguish contourites from turbidites and pelagites. Higher Hounsfield unit values have been linked to more energetic sedimentation environments, related to the strength of the bottom currents at the time of deposition.
Please use this url to cite or link to this publication:
author
promoter
UGent and UGent
organization
alternative title
Contourietdriften en koudwaterkoraalheuvels in de Atlantische Marokkaanse koraalprovincie : oorsprong, evolutie en sturende factoren
year
type
dissertation
publication status
published
subject
keyword
Sediment drifts, Gulf of Cadiz, Computed Tomography, Quaternary
pages
XXIII, 172 pages
publisher
Ghent University. Faculty of Sciences
place of publication
Ghent, Belgium
defense location
Gent : Het Pand
defense date
2017-03-29 16:00
language
English
UGent publication?
yes
classification
D1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8514984
handle
http://hdl.handle.net/1854/LU-8514984
date created
2017-03-21 08:57:41
date last changed
2017-05-16 07:16:56
@phdthesis{8514984,
  abstract     = {Research highlights:
- Topographic obstacles have a profound effect on sedimentation patterns. When bottom currents encounter topographic obstacles, they focus and intensify, leading to sediment drifts at the base. Along the tectonic ridges of the Atlantic Moroccan margin, 11{\textdegree} is the threshold for sediment drift formation, while along the mud volcanoes, sediment drifts are present at the southern and/or northern side and are related to the size of the mud volcano.
- Internal tides play an important role in the build-up of sediment drifts. Although the sediment drifts along the Atlantic Moroccan margin were mainly driven by glacial water masses, internal tidal currents play an important role in their development. They are driving long-term bottom currents and consequently influence sediment drift deposition along the tectonic ridges and mud volcanoes. Sediment drifts created or influenced by internal tidal currents could be named tidal sediment drifts and a limited extent is proposed.
- Coral mound build-up is related to climatic changes and interferes with its immediate surroundings. The Atlantic Moroccan coral province is the largest discovered coral mound province in the world so far and possesses stratigraphic evidence, 10 different initiation horizons in the subsurface, of climate-dependant growth cycles of cold-water corals. Small-scale sediment drifts are created around some of the coral mounds, evidencing deviated and intensified bottom currents. This creates elevated fluxes of food particles and sediment towards the corals, allowing proliferation.
- Diagnostic criteria for contourites could be developed based on CT analyses of sediment cores. A workflow for analysing CT-scans, based on the grey values within the radiographs, of sediment cores has been developed which can aid in the discovery of diagnostic criteria to distinguish contourites from turbidites and pelagites. Higher Hounsfield unit values have been linked to more energetic sedimentation environments, related to the strength of the bottom currents at the time of deposition.},
  author       = {Vandorpe, Thomas},
  keyword      = {Sediment drifts,Gulf of Cadiz,Computed Tomography,Quaternary},
  language     = {eng},
  pages        = {XXIII, 172},
  publisher    = {Ghent University. Faculty of Sciences},
  school       = {Ghent University},
  title        = {Contourites drifts and cold-water coral mounds in the Atlantic Moroccan coral province : origin, evolution and driving factors},
  year         = {2017},
}

Chicago
Vandorpe, Thomas. 2017. “Contourites Drifts and Cold-water Coral Mounds in the Atlantic Moroccan Coral Province : Origin, Evolution and Driving Factors”. Ghent, Belgium: Ghent University. Faculty of Sciences.
APA
Vandorpe, T. (2017). Contourites drifts and cold-water coral mounds in the Atlantic Moroccan coral province : origin, evolution and driving factors. Ghent University. Faculty of Sciences, Ghent, Belgium.
Vancouver
1.
Vandorpe T. Contourites drifts and cold-water coral mounds in the Atlantic Moroccan coral province : origin, evolution and driving factors. [Ghent, Belgium]: Ghent University. Faculty of Sciences; 2017.
MLA
Vandorpe, Thomas. “Contourites Drifts and Cold-water Coral Mounds in the Atlantic Moroccan Coral Province : Origin, Evolution and Driving Factors.” 2017 : n. pag. Print.