FN Archimer Export Format
PT J
TI Middle Pleistocene seismically induced clay diapirism in an intraplate zone, western Brittany, France
BT 
AF VAN VLIET-LANOE, Brigitte
   AUTHEMAYOU, Christine
   MOLLIEX, Stephane
   FIELD, Michael Hugh
   FRECHEN, Manfred
   LE ROY, Pascal
   PERROT, Julie
   ANDRIEU-PONEL, Valerie
   GREGOIRE, Gwendoline
   HALLEGOUET, Bernard
AS 1:1;2:1;3:1;4:2;5:3;6:1;7:1;8:4;9:1;10:5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 IUEM, CNRS, UBO, UMR Geosci Ocean 6538, Pl N Copernic, F-29280 Plouzane, France.
   Leiden Univ, Fac Archaeol, Archaeo & Palaeobot Lab, POB 9515, NL-2300 RA Leiden, Netherlands.
   Leibniz Inst Angew Geophys, Stilleweg 2, D-30655 Hannover, Germany.
   Avignon Univ, Aix Marseille Univ, CNRS, IRD,IMBE, Technopole Arbois Mediterranee,BP 80, F-13545 Aix En Provence, France.
   UBO, Geog Dept, 40 Rue Commandant Boennec, F-29490 Guipavas, France.
C2 UBO, FRANCE
   UNIV LEIDEN, NETHERLANDS
   LEIBNIZ INST ANGEW GEOPHYS, GERMANY
   UNV AVIGNON, FRANCE
   UBO, FRANCE
UM LGO
IF 2.31
TC 2
UR https://archimer.ifremer.fr/doc/00637/74955/76029.pdf
LA English
DT Article
DE ;Clay diapirism;Liquefaction;Earthquake;Saprolite;Brittany;Variscan structures;Paleoseismology;Intraplate;Middle Pleistocene
AB The Brittany region of France is located in a low seismicity intraplate zone. Most of the instrumented earthquakes are limited to a shallow crustal depth without surface rupture. A paleoseismological analysis was performed on deposits on the Crozon Peninsula and in the Elorn estuary. We highlight hydroplastic deformations induced by liquefaction leading to clay diapirism, which were likely triggered by past earthquakes. This diapirism seems to be frequent in continental nonconsolidated sediments and to develop on the inherited tectonic structures, when a shallow water table and confining layers exist. Timing of deformation is dated using paleoenvironmental data, and electron spin resonance and infrared-stimulated luminescence dating methods. Two seismic periods were identified in western Europe during early Marine Oxygen Isotope Stage (MIS) 10 (380 ka) and early MIS 8 (280-265 ka). The lack of similar deformations affecting the Holocene tidal deposits in the Bay of Brest suggests that the magnitude of the triggering paleoearthquakes is probably higher (M-w 6) than the recent events (M-w 5.4). These unusual intraplate major paleoearthquakes need specific factors affecting the far-field crustal stress loading to be triggered, such as a brief acceleration of the Africa-Eurasia lithospheric plate convergence, glacio-isostatic stress perturbations associated with the onset of major glaciations in northern Europe, or other processes induced by orbital forcing. 
PY 2019
PD JAN
SO Quaternary Research
SN 0033-5894
PU Cambridge Univ Press
VL 91
IS 1
UT 000488837500020
BP 301
EP 324
DI 10.1017/qua.2018.63
ID 74955
ER

EF