A ~240 ka record of Ice Sheet and Ocean interactions on the Snorri Drift, SW of Iceland

Core MD99-2323 was extracted from the Snorri Drift at a water depth of 1062 m, just south Denmark Strait, and ~120 km Last Glacial Maximum (LGM) margins Iceland East Greenland Ice Sheets. The core chronology (~7.5 to 240 cal ka) is derived radiocarbon dates, marker tephra, paleomagnetic excursion, correlation with North Atlantic δ18O records on Neogloboquadrina pachyderma (δ18ONp). Sedimentation averaged ~7.5 cm/kyr. Records proxy flow speed, ice rafted debris (IRD) oxygen isotopes show that many IRD abundance peaks represent winnowing fine fraction by faster flows rather than pulses increased flux. overall pattern speed does not resemble classic fast interglacial/slow glacial seen in Nordic Sea overflow, current record suggested be partly controlled production brine-driven gravity adjacent fronts, especially during cold periods. On smaller scale usual glacial/slow – interglacial/fast appears case ~5 kyr oscillations Marine Isotope Stage (MIS) 6 where periodic low matched high values planktonic isotope ratios. Eight quartz wt% reflect contributions erosion Precambrian Caledonian bedrock E NE Greenland; dolomite may glacial-marine transport Laurentide Sheet. Cross wavelet analysis δ18ONp versus sortable silt indicate significant precession obliquity periodicities, but little temporal correlations due leads lags responses.