LODEX : sémantisation & visualisation

Site exemple

Title

Sedimentary archives of the French Atlantic coast (inner Bay of Vilaine, south Brittany): Depositional history and late Holocene climatic and environmental signals

Publication Year

2010

Author(s)
  • Sorrel, Philippe
  • Tessier, Bernadette
  • Demory, Francois
  • Baltzer, Agnes
  • Bouaouina, Firas
  • Proust, Jean-Noel
  • Menier, David
  • Traini, Camille
Source
CONTINENTAL SHELF RESEARCH Volume: 30 Issue: 10-11 Pages: 1250-1266 Published: 2010
ISSN
0278-4343
Abstract

The late Holocene is of particular interest to our understanding of the evolution of coastal sedimentary systems because this period encompasses warmer and cooler periods, and rising sea level in northern Europe. Based on an approach combining AMS (14)C, sedimentological and rock magnetic analyses on sediment cores complemented with seismic data collected in the macrotidal Bay of Vilaine (south Brittany), we document the depositional history of the inner bay coeval to the mid-to late-Holocene transgression in south Brittany. Correlation between sedimentary archives revealed the main sedimentary infilling phases during the last 6000 years. Four units (U1-U4) are recognized in the coastal sediment wedge of the system, corresponding to the stepwise marine invasion of the bay. We show that (1) marine inundation, due to the steep morphology of the bedrock, is diachronous between distal and proximal records. A time lag of similar to 1000 years is inferred over a distance of less than 5 km: (2) in the outer areas, the sedimentation has been condensed since 3000 years; (3) proximal estuarine archives offer the best record of sedimentary processes covering the last 2000 years, including the Medieval Warm Period (MWP). Correlations in proximal records in the Bay of Vilaine assess the connection between coastal sedimentary dynamics, climatic conditions and anthropogenic activities during the MWP. We match the preservation of clay deposits to increased river-borne suspended matter transported to the estuary probably as a result of accelerated land-use development (higher soil erosion) in the catchment area between ca. 880 and 1050 AD. Because the preservation of estuarine sedimentary successions is favoured when coastal wave sediment reworking is minimal, it is proposed that the prevailing climatic regime in south Brittany during the MWP likely resembled to that of the preferred negative phase of the North Atlantic Oscillation (NAO). Our data are fairly consistent with other late Holocene records from northern Europe including the Atlantic seaboard. However, they outline the difficulty in interpreting climatic and anthropogenic signatures in coastal sedimentary records where high-resolution chronologies required to unravel their respective influences are still missing. (C) 2010 Elsevier Ltd. All rights reserved.

Author Keyword(s)
  • Sedimentary infilling
  • Holocene transgression
  • Climatic change
  • North Atlantic Oscillation
  • Medieval Warm Period
  • Human activity
KeyWord(s) Plus
  • INCISED VALLEY-FILL
  • ROMNEY MARSH REGION
  • MARENNES-OLERON BAY
  • ESTUARY NW FRANCE
  • NORTH-ATLANTIC
  • WESTERN FRANCE
  • LAKE BAIKAL
  • MAGNETIC-PROPERTIES
  • CONTINENTAL-SHELF
  • SEISMIC PROFILES
ESI Discipline(s)
  • Geosciences
  • Plant & Animal Science
Web of Science Category(ies)
  • Oceanography
Adress(es)

[Sorrel, Philippe; Tessier, Bernadette; Baltzer, Agnes; Bouaouina, Firas] Univ Caen, CNRS, UMR 6143, F-14000 Caen, France; [Demory, Francois] CEREGE, UMR 6635, F-13090 Aix En Provence, France; [Proust, Jean-Noel] Univ Rennes 1, CNRS, UMR 6118, F-35042 Rennes, France; [Menier, David; Traini, Camille] Univ Europeenne Bretagne, EA Geoarchitecture 2219, F-56017 Vannes, France; [Menier, David; Traini, Camille] Univ Europeenne Bretagne, UMR Geosci 6118, F-56017 Vannes, France

Reprint Adress

Sorrel, P (reprint author), Univ Lyon 1, CNRS, UMR PEPS 5125, 27-43 Bld 11 Novembre, F-69622 Villeurbanne, France.

Country(ies)
  • France
CNRS - Adress(es)
  • Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE), UMR6635
  • Géosciences Rennes, UMR6118
  • Laboratoire de Morphodynamique continentale et côtière (M2C), UMR6143
  • PaléoEnvironnements et PaléobioSphère (PEPS), UMR5125
Accession Number
WOS:000279137500007
uid:/KGSQX8PC
Powered by Lodex 8.21.4