FN Archimer Export Format
PT J
TI The evolution of a Holocene banner bank controlled by morphodynamics and structural setting of a macrotidal coast: Saint-Brieuc Bay (NW-EUROPE)
BT 
AF Traoré, Kalil
   Menier, David
   Gensac, Erwan
   LE ROY, Pascal
   Lambert, Clément
   Bessin, Paul
   Pédoja, Kevin
   Duperret, Anne
   Le Gall, Romain
AS 1:1;2:1;3:1;4:2;5:1;6:3;7:4;8:5;9:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 Laboratoire Géoscience Océan, UMR 6538, CNRS, Université Bretagne Sud, Campus de Tohannic, 56000 Vannes, France
   Laboratoire Géoscience Océan, UMR 6538, CNRS, IUEM, Université Bretagne Occidentale, 29280 Plouzané, France
   Laboratoire de Planétologie et Géodynamique, UMR 6112, CNRS, Le Mans Université, Avenue Olivier Messiaen, 72085 Le Mans CEDEX 9, France
   Laboratoire Morphodynamique Continentale et Côtière, UMR 6143, CNRS, Université Caen Normandie, campus 1, 2-4, Rue des Tilleuls, 14000 Caen cedex, France
   Laboratoire Ondes et Milieux Complexes, UMR 6294, CNRS, Université Le Havre Normandie, 53 rue de Prony, CS, 80540, 76058 Le Havre cedex, France
C2 CNRS, FRANCE
   UBO, FRANCE
   UNIV LE MANS, FRANCE
   UNIV CAEN, FRANCE
   UNIV LE HAVRE, FRANCE
UM LGO
IF 7.483
TC 1
UR https://archimer.ifremer.fr/doc/00685/79660/82424.pdf
LA English
DT Article
CR GEOSAINTBRIEUC18
   SAGRAMANCHE
BO Thalia
   Petite Marie Françoise
DE ;Sand banks;Banner bank;Holocene climate;Geomorphology;Sea level rise;Tidal gyre
AB The morphology and internal structure of the Horaine Bank (Bay of Saint-Brieuc, NW France) are described based on multibeam echosounder and high-resolution seismic datasets coupled with vibro-core data. The Horaine Bank shows large-scale bedforms in the lee of a submerged rocky shoal, which allowed defining it as a Banner Bank. The internal structure of the sandbank reveals four seismic units (U1–U4) on a Cambrian basement (U0). The basal unit U1 is interpreted as reworked lowstand fluvial sediments those infilled micro incised valleys during a rise in sea level. This unit is overlain by paleo-coastal barrier sand-spit (U2) whose development was controlled by swell in the context of a rapid rise in sea level. The successive prograding unit (U3) is interpreted as flooding deposits in continuity with unit U2. The unit U4 is characterized by oblique reflectors oriented in two opposite directions. This last unit, dated post 3500 yr BP, corresponds to migrating dunes superimposed on the bank and observable in the high-resolution bathymetric data. The strong correlation between tidal currents and the apparent clockwise migration of dune crests suggests the presence of a tidal gyre controlling the current dynamics of most of the Horaine bank dunes. This study proposes a new model for the construction of banner banks characterized by the gradual transition of a sand spit to a banner bank during marine transgression and ensuing hydrodynamic variability. 
PY 2021
PD SEP
SO Geoscience Frontiers
SN 1674-9871
PU Elsevier BV
VL 12
IS 5
UT 000692319300011
DI 10.1016/j.gsf.2021.101183
ID 79660
ER

EF