FN Archimer Export Format
PT J
TI A ~240 ka record of Ice Sheet and Ocean interactions on the Snorri Drift, SW of Iceland
BT 
AF Andrews, J.T.
   McCave, I.N.
   Syvitski, Jaia
AS 1:1;2:2;3:1;
FF 1:;2:;3:;
C1 INSTAAR & Dept. Geological Sciences, University of Colorado, Boulder, CO 80309, USA
   Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
C2 UNIV COLORADO, USA
   UNIV CAMBRIDGE, UK
IF 4.956
TC 1
UR https://archimer.ifremer.fr/doc/00691/80344/83434.pdf
LA English
DT Article
CR IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   IMAGES V LEG 5
BO Marion Dufresne
DE ;Snorri Drift;Deep Northern Boundary Current;MIS 1-7;Mineral composition;Sortable silt;Flow speed;Saline gravity current;IRD
AB Core MD99-2323 was extracted from the Snorri Drift at a water depth of 1062 m, just south of the Denmark Strait, and ~120 km from the Last Glacial Maximum (LGM) margins of the Iceland and East Greenland Ice Sheets. The core chronology (~7.5 to 240 cal ka) is derived from radiocarbon dates, marker tephra, paleomagnetic excursion, and correlation with North Atlantic δ18O records on Neogloboquadrina pachyderma (δ18ONp). Sedimentation averaged ~7.5 cm/kyr. Records of proxy flow speed, ice rafted debris (IRD) and oxygen isotopes show that many IRD abundance peaks represent winnowing of the fine fraction by faster flows rather than pulses of increased IRD flux. The overall pattern of flow speed does not resemble the classic fast interglacial/slow glacial pattern seen in records of Nordic Sea overflow, rather the current record is suggested to be partly controlled by the production of brine-driven gravity flows from adjacent ice fronts, especially during cold periods. On a smaller scale the usual glacial/slow – interglacial/fast pattern appears to be the case during ~5 kyr oscillations during Marine Isotope Stage (MIS) 6 where periodic low flow speed is matched by high values of planktonic oxygen isotope ratios. Eight peaks in quartz wt% reflect increased contributions from glacial erosion of Precambrian and Caledonian bedrock from E and NE Greenland; peaks in dolomite may reflect glacial-marine transport from the Laurentide Ice Sheet. Cross wavelet analysis of the δ18ONp versus sortable silt and quartz records indicate significant precession and obliquity periodicities, but with little temporal correlations due to leads and lags in responses. 
PY 2021
PD JUL
SO Global And Planetary Change
SN 0921-8181
PU Elsevier BV
VL 201
UT 000651378900005
DI 10.1016/j.gloplacha.2021.103498
ID 80344
ER

EF