FN Archimer Export Format
PT J
TI The Danube submarine canyon (Black Sea): morphology and sedimentary processes
BT 
AF POPESCU, Irina
   LERICOLAIS, Gilles
   PANIN, Nicolae
   NORMAND, Alain
   DINU, Cornel
   LE DREZEN, Eliane
AS 1:;2:;3:;4:;5:;6:;
FF 1:PDG-DRO-GM-SEDIMENTS;2:PDG-DRO-GM-SEDIMENTS;3:;4:PDG-DRO-GM;5:;6:PDG-DRO-GM;
C1 GeoEcoMar Constanta, RO-8700 Constanta, Romania.
   IFREMER, Ctr Brest, DRO, GM LES, F-29280 Plouzane, France.
   GeoEcoMar Bucharest, RO-70318 Bucharest, Romania.
   Univ Bucharest, Fac Geol & Geophys, RO-70139 Bucharest, Romania.
C2 GEOECOMAR CONSTANTA, ROMANIA
   IFREMER, FRANCE
   GEOECOMAR BUCHAREST, ROMANIA
   UNIV BUCHAREST, ROMANIA
SI BREST
SE PDG-DRO-GM-SEDIMENTS
   PDG-DRO-GM
IN WOS Ifremer jusqu'en 2018
   copubli-europe
IF 1.818
TC 114
UR https://archimer.ifremer.fr/doc/2004/publication-476.pdf
LA English
DT Article
CR BLASON
   BLASON 2
   CALMAR99
   ITSAS II
   ITSAS V
   MD 139 / ASSEMBLAGE - 1
BO Le Suroît
   L'Europe
   Thalia
   Marion Dufresne
DE ;Gas;Wave cut terrace;Buried fluvial channels;Headward erosion;Submarine canyon;Black Sea
AB The Danube Canyon is a large shelf-indenting canyon that has developed seaward of the late Pleistocene paleo-Danube valley. Mechanisms of canyon evolution and factors that controlled it are revealed by analyzing the morphology and the sedimentary structure of the canyon, as well as the main features of the continental margin around the canyon. This is based on investigation by swath bathymetry in the canyon area combined with different types of seismic data. The canyon is a major erosional trough with a flat bottom cut by an entrenched axial thalweg. The thalweg path varies from highly meandering to fairly straight in relation to the local gradient. Segments of the canyon are characterized by specific morphology, orientation and gradient along the axial thalweg. We interpret these segments in terms of canyon maturity. The sedimentary structure of the canyon documents an older phase of erosion followed by partial infilling, and thus attests for repeated cycles of canyon development. Canyon morphology is interpreted as a result of erosive sediment flows along the entrenched axial thalweg that caused downcutting into the canyon bottom and instability of the canyon walls, and hence enlargement of the canyon and expansion by headward erosion. During the last lowstand level of the Black Sea the canyon was located in an area of high sediment supply close to the paleo-Danube River mouths. This is indicated by buried fluvial channels on the shelf and by a wave-cut terrace associated with a water level situated about - 90 m below the present level. We infer that erosive flows in the canyon resulted from hyperpycnal currents at the river mouths, probably favored by the low salinity environment that characterized the Black Sea during lowstand times. Other mechanisms could have contributed to trigger sediment failure along the canyon, such as instability related to the presence of shallow gas, or the effect of a deep fault.
PY 2004
PD MAY
SO Marine Geology
SN 0025-3227
PU Elsevier
VL 206
IS 1-4
UT 000222257900013
BP 249
EP 265
DI 10.1016/j.margeo.2004.03.003
ID 476
ER

EF