FN Archimer Export Format
PT J
TI Nature and rates of fine-sedimentation on a mid-shelf: "La Grande Vasiere" (Bay of Biscay, France)
BT 
AF DUBRULLE, C
   JOUANNEAU, J
   LESUEUR, P
   BOURILLET, Jean-Francois
   WEBER, O
AS 1:1,2;2:2;3:1;4:3;5:2;
FF 1:;2:;3:;4:PDG-DOP-DCB-GM-LES;5:;
C1 Univ Caen, CNRS, UMR Morphodynam Continentale & Cotiere M2C 6143, F-14000 Caen, France.
   Univ Bordeaux 1, CNRS, UMR 5805, EPOC, F-33405 Talence, France.
   IFREMER, DRO GM, F-29280 Plouzane, France.
C2 UNIV CAEN, FRANCE
   UNIV BORDEAUX, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-DOP-DCB-GM-LES
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 1.684
TC 14
TU Centre national de la recherche scientifique
   Université de Bordeaux
   Université de Caen Normandie
   Université de Rouen
   École pratique des hautes études
UR https://archimer.ifremer.fr/doc/2007/publication-3539.pdf
LA English
DT Article
CR GASPROD 1
   GASPROD 2
   TROPHAL I
   TROPHAL II
BO Thalassa
   Le Suroît
DE ;Bay of Biscay;Continental shelf;Sedimentation rate;Radionuclides;Fine sediment fraction;Mud
AB The study area, "La Grande Vasiere" (LGV), stretches out on the French Atlantic continental shelf (at ca. 100 m water depth), along 250 km from the Glenan Islands at the north to the southwest of Rochebonne at the south. Box-cores were sampled in this mid-shelf area during four cruises in June 1995, and in April, June and September 2002. They were investigated using sedimentologicat approaches (X-radiographs and grain-size analyses) and radionuclide studies (Pb-210 geochronology and excess Th-234). The main results are: (1) the surficial sediments are generally organized into a decimetrescale fining up sequence which can be the result of extreme storms; (2) an upper mixing layer of 7-20cm reflects an important biological benthic activity and/or the impact of fishing (i.e. trawlers); (3) a thin (i.e. a few mm) surficial mud-rich layer is the result of the present-day sedimentation; (4) an apparent annual sedimentation rate of 1-3 mm is recorded in several loci of the study area. Some seasonal variations appear, corresponding to the deposition of fine material from April to September, and to the reworking and the re-suspension during the winter. This fine material is the result of the decantation of estuarine plumes, mainly the Loire and the Vilaine rivers, over the study area. LGV ties (1) under the influence of a winter-to-spring thermo-hatine wedge that acts as a filter for the transfer of fine river-borne material to the slope and the open sea, and (2) below water depths where the mean swell action permits sedimentation, mainly in summer.   From the point of view of the nature of its sediments, LGV is not a mud-belt, but a heterolithic and patchy sandy area that is submitted to increasing silting with environmental changes, on a seasonal-time scale.   (c) 2007 Elsevier Ltd. All rights reserved.
PY 2007
PD SEP
SO Continental Shelf Research
SN 0278-4343
PU Elsevier
VL 27
IS 16
UT 000250285100003
BP 2099
EP 2115
DI 10.1016/j.csr.2007.05.002
ID 3539
ER

EF