FN Archimer Export Format
PT J
TI Control factors of Holocene sedimentary infilling in a semi-closed tidal estuarine-like system: the bay of Brest (France)
BT 
AF GREGOIRE, Gwendoline
   LE ROY, Pascal
   EHRHOLD, Axel
   JOUET, Gwenael
   GARLAN, Thierry
AS 1:1,2;2:1;3:2;4:2;5:3;
FF 1:;2:;3:PDG-REM-GM-LGS;4:PDG-REM-GM-LGS;5:;
C1 Inst Univ Europeen Mer, UMR Domaines Ocean Technopole Brest Iroise 6538, F-29280 Plouzane, France.
   IFREMER, Geosci Marines Ctr, BP70,CS10070, F-29280 Plouzane, France.
   SHOM, Ctr Hydrog, BP426, F-29275 Brest, France.
C2 UBO, FRANCE
   IFREMER, FRANCE
   SHOM, FRANCE
SI BREST
SE PDG-REM-GM-LGS
UM LGO
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.364
TC 30
UR https://archimer.ifremer.fr/doc/00358/46968/46883.pdf
LA English
DT Article
CR GEOBREST
   GEOBREST 2018
   GEOBREST 2019
   HALIORADE 1
   SAMDISOIR
   SERABEQ-01 LEG1
   SERABEQ-01 LEG2
   SERABEQ-02 LEG1
   SERABEQ-02 LEG2
   SERABEQ-03
BO Côtes De La Manche
   Haliotis
   Thalia
   Albert Lucas
DE ;Tide-dominated estuary;incised-valley;holocene infill;seismic stratigraphy;estuarine processes;Bay of Brest
AB This study details the sedimentary infilling of an original tidal-dominated estuary system during the final stage of the last marine transgression. The Bay of Brest is confined and connects the rivers Elorn and Aulne, to the sea of Iroise by a narrow strait encasing a well preserved paleo-channel. The compilation of high- and very-high-resolution bathymetric and seismic data, constrained by sediments datations, allows us to classify the paleo-morphology of the bay into three stepped domains: the paleo-valley floor surrounded by fluvial terraces, the central plateau, and the shallow embayments. Taking into account the main factors controlling the infilling, including sea-level rise, substratum morphology, and hydrodynamics, the stratigraphic scheme of the bay has been reconstructed. The lowstand system track (LST) is assumed to correspond to relict Pleistocene continental deposits associated with the last low sea level around 21,000 cal yr B.P. The transgressive phase, represented by the transgressive system track (TST), is divided into two parts. The lower part (TST1) constitutes the first stage of transgressive deposition in the bay. Starting around 9000 cal yr B.P. and currently conserved in the shallowest parts, it is characterized by tidal flats associated with deposits in the inner estuary. This stage ends at about 7000 cal yr B.P. and is separated from the upper part (TST2) by a tidal ravinement surface that occurs around 7700 cal yr B.P. at the foot slope. TST2 formed sand bodies in the central part of the bay between 6800 and 3000 cal yr B.P. These deposits, interpreted as tidal banks, are associated with the outer estuarine environment. The maximum flooding surface (MFS), dated around 3000 and 2000 cal yr B.P., marked the installation of a highstand system track (HST) under the combined influence of tidal currents, storms events, and anthropogenic activity. The geometry deposition of each system track is controlled at the first order by the combination of the irregular Holocene sea level rise and the inherited rocky substratum morphology. The retreat of the shoreline, and estuarine environments, is function of the successive flooding of stepped domains. The direct evolution of the volume of the assumed accumulated sea water in the bay favoured the gradual installation of the present-day hydrodynamic circulation.
PY 2017
PD MAR
SO Marine Geology
SN 0025-3227
PU Elsevier Science Bv
VL 385
UT 000398764600007
BP 84
EP 100
DI 10.1016/j.margeo.2016.11.005
ID 46968
ER

EF