Radiocarbon dating and physical properties of sediment core GeoB17623-2 ...

• Main Authors: Zecchin, Massimo, Rebesco, Michele, Lucchi, Renata G, Caffau, Mauro, Lantzsch, Hendrik, Hanebuth, Till J J
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Center for Marine Environmental Sciences MARUM; Barents Sea; Spitsbergenbanken
• Online Access: https://dx.doi.org/10.1594/pangaea.873865; https://doi.pangaea.de/10.1594/PANGAEA.873865

PARASOUND (3.5 kHz) subbottom echosounder profiles acquired on the southern Spitsbergenbanken, NW Barents Sea, show iceberg-keel scouring features which are buried by sediment that accumulated during the post Last Glacial Maximum (LGM) sea-level rise. Four acoustic units (Units 1 to 4 in stratigraphic order) were differentiated, based on the characterization of their acoustic facies and reflection surfaces. Unit 1 shows a chaotic internal structure and is interpreted as a glacial till, whereas the laminated Units 2 to 4 accumulated by sediment settling from suspension clouds and bottom currents during the last deglaciation phase. The top of Unit 2 was frequently incised by iceberg keels, resulting in up to 12 m deep ploughmarks which were later filled and buried by Unit 3 and 4 sediments. Three main paleo-evironmental changes controlled the evolution of the facies succession: (1) The major shift from till formation (Unit 1) below grounded ice to the accumulation of laminated sediments (Unit 2) which are ... : Supplement to: Zecchin, Massimo; Rebesco, Michele; Lucchi, Renata G; Caffau, Mauro; Lantzsch, Hendrik; Hanebuth, Till J J (2016): Buried iceberg-keel scouring on the southern Spitsbergenbanken, NW Barents Sea. Marine Geology, 382, 68-79 ...