FN Archimer Export Format
PT J
TI Sediment failures within the Peach Slide (Barra Fan, NE Atlantic Ocean) and relation to the history of the British-Irish Ice Sheet
BT 
AF OWEN, Matthew J.
   MASLIN, Mark A.
   DAY, Simon J.
   LONG, David
AS 1:1,4;2:1;3:2;4:3;
FF 1:;2:;3:;4:;
C1 UCL, Dept Geog, Gower St, London WC1E 6BT, England.
   UCL, Dept Earth Sci, Gower St, London WC1E 6BT, England.
   British Geol Survey, Murchison House,West Mains Rd, Edinburgh EH9 3LA, Midlothian, Scotland.
   Geol Survey Denmark & Greenland, C F Mollers Alle 8,Bldg 1110, DK-8000 Aarhus C, Denmark.
C2 UNIV COLL LONDON, UK
   UNIV COLL LONDON, UK
   BRITISH GEOL SURVEY, UK
   GEOL SURVEY DENMARK & GREENLAND, DENMARK
IF 4.641
TC 3
UR https://archimer.ifremer.fr/doc/00495/60704/101196.pdf
LA English
DT Article
CR IMAGES 1-MD101
BO Marion Dufresne
DE ;Barra fan;Peach slide;Submarine mass movement;Quaternary;British-Irish Ice Sheet;Glaciation;North atlantic;Sedimentology-marine cores
AB The Peach Slide is the largest known submarine mass movement on the British continental margin and is situated on the northern flank of the glacigenic Barra Fan. The Barra Fan is located on the northwest British continental margin and is subject to cyclonic ocean circulation, with distinct differences between the circulation during stadial and inter-stadial periods. The fan has experienced growth since continental uplift during the mid-Pliocene, with the majority of sediments deposited during the Pleistocene when the fan was a major depocentre for the British-Irish ice Sheet (BIIS). Surface and shallow sub-surface morphology of the fan has been mapped using newly digitised archival paper pinger and deep towed boomer sub-bottom profile records, side scan sonar and multibeam echosounder data. This process has allowed the interpretation and mapping of a number of different seismic facies, including: contourites, hemipelagites and debrites. Development of a radiocarbon based age model for the seismic stratigraphy constrains the occurrence of two periods of slope failure: the first at circa 21 ka cal BP, shortly after the BIIS's maximum advance during the deglaciation of the Hebrides Ice Stream; and the second between 12 and 11 ka cal BP at the termination of the Younger Dryas stadial. Comparison with other mass movement events, which have similar geological and oceanographic settings, suggests that important roles are played by contouritic and glacigenic sedimentation, deposited in inter-stadial and stadial periods respectively when different thermohaline regimes and sediment sources dominate. The effect of this switch in sedimentation is to rapidly deposit thick, low permeability, glacigenic layers above contourite and hemipelagite units. This process potentially produced excess pore pressure in the fan sediments and would have increased the likelihood of sediment failure via reduced shear strength and potential liquefaction. 
PY 2018
PD MAY
SO Quaternary Science Reviews
SN 0277-3791
PU Pergamon-elsevier Science Ltd
VL 187
UT 000430901700001
BP 1
EP 30
DI 10.1016/j.quascirev.2018.03.018
ID 60704
ER

EF