Stratigraphy in the Greenland/ Iceland/Norwegian (GIN) seas: A multiproxy approach on Pleistocene sediments

• Main Authors: Sabine, Marjolaine, Eynaud, Frédérique, Zaragosi, Sébastien, Giraudeau, Jacques, Debret, Maxime, Rossignol-Malaize, Linda, Charlier, Karine, Billy, Isabelle, Malaize, Bruno, Daynac, Jimmy, Marches, Elodie, Garlan, Thierry
• Other Authors: UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Service Hydrographique et Océanographique de la Marine (SHOM), Ministère de la Défense
• Format: Book Part
• Language: English
• Published: HAL CCSD 2022
• Subjects: Nordic seas; Pleistocene; glacial sediments; multiproxy stratigraphy; [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy; Greenland; Iceland; Nordic Seas; North Atlantic
• Online Access: https://hal-cnrs.archives-ouvertes.fr/hal-03809979; https://hal-cnrs.archives-ouvertes.fr/hal-03809979/document; https://hal-cnrs.archives-ouvertes.fr/hal-03809979/file/pagination_SATS_53.pdf; https://doi.org/10.1016/bs.sats.2022.09.004

International audience A multiproxy sedimentological study was conducted on five sediment cores retrieved between 67 and 79°N in the Greenland/Iceland/Norwegian seas in order to infer a common chronostratigraphic model for the selected cores. This model is based on the use of a series of geochemical, physical and micropaleontological proxies which are routinely measured in sedimentological investigations of marine sediment cores: the major and minor element content derived from X-Ray Fluorescence (XRF) core scanner analyses; the lightness and color of the sediment derived from spectrophotometry analyses; the magnetic susceptibility of the sediment; the distribution of planktonic foraminiferal assemblages combined to coccolith stratigraphy (acme zones) providing preliminary stratigraphic tie points. All those proxies are correlated independently between the five sediment cores. Our results demonstrate that high resolution studies using those standard paleoceanographical tools are powerful for establishing core-to-core correlation. A chronostratigraphical framework is proposed based on the correlation of the planktonic δ 18 O isotopic record obtained in core M17KC03 with the LR04 benthic δ 18 O reference stack. A comparison between the M17KC03 stratigraphy and other dated cores from the sub-polar North Atlantic confirms the robustness of the approach. Our study suggests that XRF core scanner-derived elemental ratios (especially those related to Ca), the lightness L* and the coccolith-based biostratigraphy provide robust stratigraphic tie-points at the scale of the whole Greenland/Iceland/Norwegian seas. The elemental ratio Sr/sum, the magnetic