FN Archimer Export Format
PT J
TI Buried fluvial incisions as a record of Middle-Late Miocene eustasy fall on the Armorican Shelf (Bay of Biscay, France)
BT 
AF PAQUET, Fabien
   MENIER, David
   ESTOURNES, Guilhem
   BOURILLET, Jean-Francois
   LEROY, Pascal
   GUILLOCHEAU, Francois
AS 1:1,5;2:1;3:1;4:2;5:3;6:4;
FF 1:;2:;3:;4:PDG-DPCP;5:;6:;
C1 Univ Bretagne Sud, EA GeoArchitecture 2219, F-56017 Vannes, France.
   IFREMER, Ctr Brest, F-29280 Plouzane, France.
   IUEM, F-29280 Plouzane, France.
   Univ Rennes 1, CNRS, UMR Geosci Rennes 6118, F-35042 Rennes, France.
   Bur Rech Geol & Minieres, Geol Div, F-45060 Orleans 2, France.
C2 UBS, FRANCE
   IFREMER, FRANCE
   UBO, FRANCE
   UNIV RENNES, FRANCE
   BRGM, FRANCE
SI BREST
SE PDG-DPCP
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-p187
   copubli-univ-france
IF 2.517
TC 24
UR https://archimer.ifremer.fr/doc/00001/11200/8047.pdf
   https://archimer.ifremer.fr/doc/00001/11200/8048.pdf
LA English
DT Article
DE ;Armorican Shelf;incised valleys;Miocene;eustasy;passive margin
AB High-resolution seismic data have been acquired in June 2008 on the Armorican Shelf (AS), in the northern Bay of Biscay, in order to reassess its stratigraphic architecture in detail and to study the impact of eustasy, tectonic and sediment delivery on the margin sedimentary record. Several profiles show fluvial-type incisions of several tens of meters (up to 54 m) associated to a widespread erosion surface. Several hypotheses are proposed for the stratigraphic position of this surface and incisions. We suggest Middle to Late Miocene age. Considering the relatively quiescent tectonic activity of the margin, we infer that the relative sea-level fall responsible of aerial incision on the Miocene shelf is eustasy-related. We propose the attested Serravallian-Tortonian eustatic lowstand (c. 11.6 Ma) as the key event responsible of such erosion and incision. This event marks the early beginning of the high-amplitude sea-level fluctuations that culminated during the Pleistocene and significantly controlled the present day AS morphology. The variability of vertical incision observed along single reaches can be explained by the confluence of several tributaries, the sinuosity of the channel and can be amplified by the unconsolidated nature of the Miocene substratum. The main pathways of the fluvial network corresponding to these buried valleys have been reconstructed and connections to other existing networks are proposed. (C) 2009 Elsevier B.V. All rights reserved.
PY 2010
PD JAN
SO Marine Geology
SN 0025-3227
PU Elsevier Science Bv
VL 268
IS 1-4
UT 000274610100012
BP 137
EP 151
DI 10.1016/j.margeo.2009.11.002
ID 11200
ER

EF