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Theses

Processus sédimentaires et activité de la Veine d'Eau
Méditerranéenne au cours du Quaternaire terminal dans le
Golfe de Cadix

Abstract : This thesis represents a multidisciplinary approach of present and past deposits in the
eastern part of the Gulf of Cadiz in order to improve the understanding of the MOW dynamics
and to characterise the forcing parameters at the origin of the sedimentary variability that has
been observed since the Late Pleistocene. The present circulation pattern perfectly reflects the
sedimentary facies distribution and shows widespread failure scars. The seafloor morphology
and the Coriolis force play an important role on the orientation and intensity of the distinct
MOW branches. The westward decrease of both velocity and competence of the MOW comes
with a reduction of the deposit grain-size. Chronostratigraphic and seismic studies allow
constraining the contouritic sequence deposits at temporal and spatial scales. Climate is a
major forcing parameter on the sedimentation during the last 50 000 years. In addition to
high-frequency climatic changes, glacio-eustatic variations appear to be responsible for the
important change of the sedimentation environment at the early beginning of the present
interglacial period. Finally, the multiphased formation of the channel-lobe systems located at
the mouth of the contouritic channels shows the interaction between contouritic and gravity
processes. The activity of these systems appears mainly controlled by the MOW, the seafloor
morphology and the climatic change during the Late Quaternary.
Document type :
Theses
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https://tel.archives-ouvertes.fr/tel-00173663
Contributor : Vincent Hanquiez <>
Submitted on : Thursday, September 20, 2007 - 1:22:15 PM
Last modification on : Friday, September 18, 2020 - 2:34:10 PM
Long-term archiving on: : Thursday, April 8, 2010 - 8:35:15 PM

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  • HAL Id : tel-00173663, version 1

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CNRS | AOM | INSU | EPHE | PSL

Citation

Vincent Hanquiez. Processus sédimentaires et activité de la Veine d'Eau
Méditerranéenne au cours du Quaternaire terminal dans le
Golfe de Cadix. Minéralogie. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00173663⟩

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