FN Archimer Export Format
PT J
TI Influence of early diagenesis on geotechnical properties of clay sediments (Romania, Black Sea)
BT 
AF BALLAS, Gregory
   GARZIGLIA, Sebastien
   SULTAN, Nabil
   PELLETER, Ewan
   TOUCANNE, Samuel
   MARSSET, Tania
   RIBOULOT, Vincent
   KER, Stephan
AS 1:1,2;2:1;3:1;4:1;5:1;6:1;7:1;8:1;
FF 1:PDG-REM-GM-LAD;2:PDG-REM-GM-LAD;3:PDG-REM-GM;4:PDG-REM-GM-LCG;5:PDG-REM-GM-LGS;6:PDG-REM-GM-LGS;7:PDG-REM-GM-LAD;8:PDG-REM-GM-LAD;
C1 IFREMER, Geosci Marines, BP70, F-29280 Plouzane, France.
   Montpellier Univ, Lab Geosci Montpellier, Campus Triolet Cc060,Pl Eugene Bataillon, F-34095 Montpellier 5, France.
C2 IFREMER, FRANCE
   UNIV MONTPELLIER, FRANCE
SI BREST
SE PDG-REM-GM-LAD
   PDG-REM-GM
   PDG-REM-GM-LCG
   PDG-REM-GM-LGS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 3.909
TC 20
UR https://archimer.ifremer.fr/doc/00439/55064/56545.pdf
LA English
DT Article
CR GHASS
BO Pourquoi pas ?
DE ;Lacustrine clay sediment;Structured material;Sulfur cement;Carbonate cement;Early diagenesis;Weak layer
AB The geotechnical properties of clay sediments were investigated using laboratory and in-situ measurements as part of the geohazard assessment in the Romanian sector of the Black Sea affected by landslides and seafloor deformation features. The sediments were characterized as predominantly high plastic silty clay of high compressibility, low undrained shear strength, low cohesion and moderate sensitivity. A shallow increase in shear strength exceeding the general trend could have been reconciled with evidence for the precipitation of iron sulfides and calcium carbonates related to early diagenetic reactions of sulfate reduction (e.g. cryptic sulfur cycle) and anaerobic oxidation of methane. Comparison of the compression behaviour of natural and reconstituted samples indicated that precipitation of these materials at particle contacts produced cementation. The analysis of deeper sediments sharing similar geochemical properties illustrated that the early precipitation of even low quantity of sulfur and carbonate cements allowed clays to develop sufficient strength to preserve an abnormal high water content even under tens of meters burial depth. Because this cementation process was observed to be associated with an enhanced sensitivity and a strain softening response to undrained shearing it was concluded that such early diagenesis should be considered as a key environmental factor, leading to weak layer formation that may influence the susceptibility of seafloor to failure. 
PY 2018
PD JUL
SO Engineering Geology
SN 0013-7952
PU Elsevier Science Bv
VL 240
UT 000435060500015
BP 175
EP 188
DI 10.1016/j.enggeo.2018.04.019
ID 55064
ER

EF