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Interpretación paleoambiental de las facies holocenas de Urdaibai (golfo de Vizcaya)

Palaeoenvironmental interpretation of the Holocene facies from Urdaibai (Bay of Biscay)

Océanographie du Golfe de Gasgogne (Biarritz, 4-6 avril 2000)

Auteur(s) et Affiliation(s)

PASCUAL, Ana
Universidad del País Vasco/EHU, Facultad de Ciencias, Dpto de Estratigrafía y Paleontología, Apdo 644, 48080 Bilbao, Espagne
WEBER, Olivier
Université de Bordeaux 1, département géologie et océanographie, UMR-CNRS-EPOC 5805, avenue des Facultés, 33405 Talence, France
Universidad del País Vasco/EHU, Facultad de Ciencias, Dpto de Estratigrafía y Paleontología, Apdo 644, 48080 Bilbao, Espagne
JOUANNEAU, Jean-Marie
Université de Bordeaux 1, département géologie et océanographie, UMR-CNRS-EPOC 5805, avenue des Facultés, 33405 Talence, France
CABALLERO, Fernando
Universidad del País Vasco/EHU, Facultad de Ciencias, Dpto de Estratigrafía y Paleontología, Apdo 644, 48080 Bilbao, Espagne


Description :
In this work have been analyzed the sedimentology and micropalaeontological content (benthic foraminifers, ostracods) of two cores located at the right margin of the Urdaibai estuary (southern bay of Biscay). Four sedimentary episodes with a maximum age of 6 400 years have been recognized. During the first phase this area was under marine conditions, with a maximum marine influence at around 5 000 years BP, which is coincident with the pulsation described during the Atlantic-Subboreal transition. This episode ends with the transgressive pulsation described in previous works at 2 500 years BP. The second phase (1 960 BP) shows outer estuarine palaeoenvironments that were progressively filled, till the appearance of a vegetated marsh during the third episode. The core top bears fine sediment with very scarce microfauna indicative of the filling of this part of the estuary. This marsh, which is progressively isolated from the tidal influence, was anthropologically transformed from the XVIIIth Century onwards.


Type de document :
Congrès

Source :
Colloque international d'océanographie du Golfe de Gascogne, 7, Biarritz, France, 2000-04-04, Actes de colloques - IFREMER, issn : 0761-3962, 2001, vol. 31, p. 262-267, Collation : Illustration, Références bibliographiques : 8 ref.

Date :
2001

Identifiants :
isbn : 2-84433-054-1

Editeur :
Pays édition : France, Plouzané, Institut français de recherche pour l'exploitation de la mer

Langue :
EspagnolAnglais
Droits :
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