Sediment structure and deposition rates in the Yukon coast ...

• Main Authors: Carnero-Bravo, Vladislav, Falardeau, Jade, Chassiot, Léo, Tanski, George, Hillaire-Marcel, Claude, Ghaleb, Bassam, de Vernal, Anne, Vonk, Jorien E, Lantuit, Hugues, Fritz, Michael, Preda, Michel
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2021
• Subjects: Arctic Ocean; chronology; estuaries; Lagoon; marine sediments; mineralogy; Nearshore; Permafrost coasts; Beaufort Sea; Herschel; permafrost; Yukon
• Online Access: https://dx.doi.org/10.1594/pangaea.937387; https://doi.pangaea.de/10.1594/PANGAEA.937387

The aim of this project was to investigate nearshore depositional processes in the Arctic within the last century. For this study sediment cores were retrieved from lagoon and marine sites at Kanivaliuraq – Ptarmigan Bay (lagoon) and Herschel Basin (marine). The lagoon (YC18-PB-SC01, 64 cm length) and two marine (YC18-HB-GC01, 40 cm length; and PG2303-1, 20 cm length) sediment cores, were collected at 3, 18 and 43 m water depth, respectively. Sampling missions took place in April 2016 and August 2018 in the nearshore areas of the southern Beaufort Sea along the Yukon North Slope in the western Canadian Arctic. Lagoon core YC18-PB-SC01 was taken with a percussion corer and marine cores with an UWITEC gravity corer. The cores were kept cool and dark until further analysis in the laboratories. Mineralogy composition was obtained by X-ray diffraction (XRD) of bulk sediment (well ground and mixed) through a Siemens D500 X-Ray diffractometer and the spectra were resolved with EVA Bruker-AXS software. The grain ...