FN Archimer Export Format
PT J
TI What forced the collapse of European ice sheets during the last two glacial periods (150 ka BP and 18 ka cal BP)? Palynological evidence
BT 
AF PENAUD, A.
   EYNAUD, F.
   TURON, J. L.
   ZARAGOSI, S.
   MALAIZE, B.
   TOUCANNE, Samuel
   BOURILLET, Jean-Francois
AS 1:1;2:1;3:1;4:1;5:1;6:1;7:2;
FF 1:;2:;3:;4:;5:;6:;7:PDG-DOP-DCB-GM-LES;
C1 Univ Bordeaux 1, CNRS, EPOC, UMR 5805, F-33405 Talence, France.
   IFREMER, Dept Geosci Marines, Lab Environm Sedimentaires, F-29280 Plouzane, France.
C2 UNIV BORDEAUX, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-DOP-DCB-GM-LES
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.646
TC 31
UR https://archimer.ifremer.fr/doc/00000/11116/6725.pdf
   https://archimer.ifremer.fr/doc/00000/11116/8061.pdf
LA English
DT Article
CR IMAGES 1-MD101
   MD 123 / GEOSCIENCES 1
   MD 133 / SEDICAR
BO Marion Dufresne
DE ;Dinoflagellate cysts;European ice sheets;Celtic Armorican margin;MIS 2 and MIS 6;Terminations I and II
AB We present a new marine palynological record from the temperate North-eastern Atlantic (core MD03-2692, Celtic-Armorican margin) in the area of influence of the 'Fleuve Manche' paleoriver during glacial times. The runoff of this paleoriver was connected to the glacial history of European ice sheets (including the British Irish Ice Sheet-BIIS). Our study conducted on dinoflagellate cysts assemblages over the last 200 ka, associated with quantification of palynological remains reflecting continental influence (pre-Quaternary dinocysts and micro-algae Pediastrum spp. coenobia), yields detailed insights into the sea-surface paleoenvironments of this sector. More specifically, mechanisms responsible for the origin of unusual deposits of laminated sequences found at the end of Marine Isotope Stage (MIS) 2 and within mid-MIS 6 are here constrained. We provide evidence of genetic similarities between fluvial discharges occurring before and during times of deposition of the laminated deposits. Our study clarifies the causes of the collapse of European glaciated systems. At the end of MIS 2, prior to the deposition of the laminated deposits, plenioceanic influence characterized by high concentrations of Quaternary dinocysts prevailed, and a dinocyst species tracing the penetration of the warm North Atlantic Drift into the Bay of Biscay is recorded. However, this scenario did not recur prior to the deposition of laminated sediments of mid-MIS 6. In addition, contrary to the laminated deposits found at the end of MIS 2 and directly associated with Termination I, MIS 6 laminae appeared 20 ka earlier than Termination II. Our work shows that, during the penultimate glacial stage, the collapse of mid-latitudes ice sheets around 170 ka B.P. may have immediately followed the MIS 6.5 warming phase. Then, the most important melting event around 150 ka B.P. may be linked to a peak in insolation at 65 degrees N, though less important than those during MIS 6.5 and Termination II.
PY 2009
PD OCT
SO Palaeogeography Palaeoclimatology Palaeoecology
SN 0031-0182
PU Elsevier Science Bv
VL 281
IS 1-2
UT 000271361400006
BP 66
EP 78
DI 10.1016/j.palaeo.2009.07.012
ID 11116
ER

EF