Stable isotopes and Mg/Ca of sediment core MSM45/19-2 ...

• Main Authors: Lochte, Annalena Antonia, Schneider, Ralph R
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: 8.2 ka event; Labrador Sea; Mg/Ca-based paleotemperatures; stable oxygen isotopes; DEPTH, sediment/rock; AGE; Islandiella helenae, Magnesium/Calcium ratio; Islandiella helenae, Magnesium/Calcium ratio, standard deviation; Bottom water temperature; Bottom water temperature, standard deviation; Islandiella helenae, δ18O; δ18O, seawater, reconstructed; δ18O, ice volume free, seawater; Gravity corer; Inductively coupled plasma-optical emission spectrometer ICP-OES, Thermo Electron, Iris Intrepid II; Mass spectrometer, Thermo Finnigan, MAT 253; Calculated from Mg/Ca ratios and d18O corrected; Calculated from Mg/Ca ratios and d18O and corrected for ice volume; MSM45; Maria S. Merian; Hudson Bay
• Online Access: https://dx.doi.org/10.1594/pangaea.945715; https://doi.pangaea.de/10.1594/PANGAEA.945715

The presented data originates from the 1306cm long gravity core MSM45-19-2 (58°45.68 N, 61°56.25 W, 202m water depth) taken during R/V Maria S. Merian cruise MSM45 in August 2015 at 202 m water depth on the northern Labrador Shelf, northeast Canada, northwest Atlantic.Here, we present a high-resolution and well-dated sediment record from the northern Labrador Shelf that provides new evidence of the freshwater signature and the mechanisms involved in the Hudson Bay Ice Saddle collapse. A combination of Mg/Ca ratios and stable oxygen isotopes of benthic foraminifera indicate temperature changes and freshening of Labrador Shelf bottom waters.About 60 specimens of I. helenae were handpicked from the 200–315 μm fraction in 5-cm intervals downcore, weighed, and crushed between two glass plates. The crushed samples were then split for Mg/Ca and stable isotope measurements (see below). About two thirds of each crushed sample was transferred into pre-leached Eppendorf vials and cleaned following the full protocol of ...