KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum) ...

• Main Authors: Gil, Isabelle M, Keigwin, Lloyd D
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2022
• Subjects: detrital events; diatoms; Ice Rafted Debris; Last Glacial Maximum; Laurentide Ice Sheet; subglacial flows; Canada; Ice Sheet; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.943366; https://doi.pangaea.de/10.1594/PANGAEA.943366

Millennial scale events marked by the contribution of detrital sand are recorded in North Atlantic sediments during the Last Glacial Maximum (LGM), between Heinrich events (HE) 1 and 2, and left their imprint on Laurentian Fan (LF – 43◦N) sediments off eastern Canada. The LF counterpart of the wellknown detrital events consist of glacial red-brick sediments resulting from subglacial flows separated by olive-grey sediments appears at ∼21.4–19.9 and ∼19.5–18.65 cal kyr BP. High-resolution analyses of diatom assemblages and lithic grains coupled with planktonic oxygen isotopic records reveal that while the red sediment is almost barren of diatoms, foraminifera and lithics (>150 μm), they are abundant in the olive-grey sediment. Diatom assemblages reveal three phases during these events: (1) initial relatively warm/temperate conditions followed by (2) very cold surface water and drifting ice, and (3) a final phase characterized by relatively warmer waters and the appearance of detrital carbonate. Although ...