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Comptes Rendus Géoscience
Volume 335, n° 5
pages 487-494 (mai 2003)
Doi : 10.1016/S1631-0713(03)00066-X
Received : 6 January 2003 ;  accepted : 1 April 2003
La vallée d'Ys : un paléoréseau hydrographique immergé en baie de Douarnenez (Finistère, France)
Ys Valley: a submerged palaeoriver pattern in the Bay of Douarnenez (Brittany, France)

Gwénaël  Jouet a ,  Claude  Augris b * ,  Bernard  Hallegouët c ,  Pascal  Le Roy a ,  Joël  Rolet a
aInstitut universitaire européen de la Mer, UMR 6538 « Domaines océaniques », place Nicolas-Copernic, 29280 Plouzané, France 
bIfremer, « Géosciences marines », technopôle Brest-Iroise, BP 70, 29280 Plouzané, France 
cUniversité de Bretagne occidentale, département de géographie, BP 817, 29285 Brest cedex, France 

*Auteur correspondant.
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L'interprétation de données de sismique réflexion acquises dans la baie de Douarnenez (Finistère) au cours de la campagne Canadou 2000 a permis la restitution de la morphologie du substratum et l'étude des remplissages sédimentaires. Le toit du substratum de la baie de Douarnenez révèle ainsi un réseau de paléovallées, entaillé lors de périodes d'émersion dans un soubassement sédimentaire briovérien et paléozoïque. Au cours des derniers interglaciaires, les invasions marines répétées déterminent la répartition des formations sédimentaires du domaine côtier, déposées successivement en conditions continentales, fluvio-estuariennes, puis marines. Pour citer cet article : G. Jouet et al., C. R. Geoscience 335 (2003). Pour citer cet article : G. Jouet et al., C. R. Geoscience 335 (2003).

Mots clés  : baie de Douarnenez ; sismique ; Bretagne ; paléovallées ; paléorivages ; remplissages sédimentaires ; eustatisme ; Quaternaire ; France.

Abstract

Interpretation of the recent high-resolution survey, CANADOU 2000, in the Bay of Douarnenez (Finistère, France) allowed us to restore the morphology of the substratum and the sedimentary filling of the bay. The Brioverian and Palaeozoic substratum reveals a well-defined network of incised valleys as results of successive emergence stages of the Bay during the Quaternary. Valleys join in a westward-widened mean valley, called Ys Valley. The present-day sedimentary fill of the bay of Douarnenez appears mainly controlled by the Holocene rise and the consecutive highstand. It comprises fluvial and estuarine deposits filling up incised valleys and marine sedimentation extending out of the incised valleys. To cite this article: G. Jouet et al., C. R. Geoscience 335 (2003). To cite this article: G. Jouet et al., C. R. Geoscience 335 (2003).

Mots clés  : Bay of Douarnenez ; seismic ; Brittany ; incised valley ; palaeoshoreline ; sedimentary filling ; eustasy ; Quaternary ; France.




© 2003  Académie des sciences@@#104156@@

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