FN Archimer Export Format
PT J
TI Altered volcanic deposits as basal failure surfaces of submarine landslides
BT 
AF MIRAMONTES, Elda
   SULTAN, Nabil
   GARZIGLIA, Sebastien
   JOUET, Gwenael
   PELLETER, Ewan
   CATTANEO, Antonio
AS 1:1;2:1;3:1;4:1;5:1;6:1;
FF 1:PDG-REM-GM-LAD;2:PDG-REM-GM;3:PDG-REM-GM-LAD;4:PDG-REM-GM-LGS;5:PDG-REM-GM-LCG;6:PDG-REM-GM-LAD;
C1 IFREMER, Geosci Marines, F-29280 Plouzane, France.
C2 IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LAD
   PDG-REM-GM
   PDG-REM-GM-LGS
   PDG-REM-GM-LCG
IN WOS Ifremer jusqu'en 2018
IF 5.006
TC 9
UR https://archimer.ifremer.fr/doc/00444/55565/57176.pdf
LA English
DT Article
CR PRISME 2
   PRISME 3
BO L'Atalante
   Pourquoi pas ?
AB One of the main concerns regarding the development of submarine landslides is the role played by weak layers in the failure process and, in particular, their impact in terms of volume, shape, and evolution of mass movements. In the present study we identified a weak layer in the eastern margin of the Corsica Trough (northern Tyrrhenian Sea) that formed the basal failure surface of the Pianosa Slump at 42–50 ka. This layer is characterized by high water content, high plasticity, high compressibility, and post-peak strain softening behavior (i.e., strength loss with increasing strain). These specific mechanical and sedimentological properties seem to be related to the presence of analcime zeolites with a concentration of 2–4% in the muddy sediment. Zeolites commonly form by the alteration of volcanic rocks and were deposited on the slope during a sea level low-stand. The influence of the zeolitic layer on slope instability was tested numerically using an elastic-perfectly plastic model that exhibits strain softening. Modeling results show that erosion at the foot of the slope could lead to enough strain to reduce the shear strength of the zeolitic layer and lead to slip in this layer. We conclude that the strain softening behavior of muddy zeolitic sediment plays an important role in predisposing submarine landslides on continental slopes. 
PY 2018
PD JUN
SO Geology
SN 0091-7613
PU Geological Soc Amer, Inc
VL 46
IS 7
UT 000436464200022
BP 663
EP 666
DI 10.1130/G40268.1
ID 55565
ER

EF