Radiocarbon ages, clay mineral content and planktic foraminifera counts of sediment cores from the SW Barents Sea, supplement to: Junttila, Juho; Aagaard-Sørensen, Steffen; Husum, Katrine; Hald, Morten (2010): Late Glacial–Holocene clay minerals elucidating glacial history in the SW Barents Sea. Marine Geology, 276(1-4), 71-85
Detailed investigations of the distribution of clay minerals of Late Glacial-Holocene sediments from the SW Barents Sea provide important new information about the provenance and transport paths of the sediments. This information leads to better understanding of the onset of the last deglaciation an...
| Main Authors: | , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA - Data Publisher for Earth & Environmental Science
2010
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.811757 https://doi.pangaea.de/10.1594/PANGAEA.811757 |
| Summary: | Detailed investigations of the distribution of clay minerals of Late Glacial-Holocene sediments from the SW Barents Sea provide important new information about the provenance and transport paths of the sediments. This information leads to better understanding of the onset of the last deglaciation and subsequent advances/retreats of the Barents Sea- and Fennoscandian Ice Sheets. The results show interaction and changes in the Fennoscandian Ice Sheet and Bj0rn0yrenna Ice Stream during the last deglaciation. High illite content and maximum kaolinite content (>18700 cal yr B.P.) indicate glacial erosion from both the Fennoscandian Ice Sheet and Bjornoyrenna Ice Stream (LGM II). The occurrence of a C. reniforme dominated benthic foraminiferal assemblage (~18700 cal yr B.P.) indicates that the northern most cores site in Ingoydjupet had already been deglaciated and was probably situated in a glacier distal environment. In addition, smectite content reaching its highest level, concurrent with the presence of Neogloboquadrina pachyderma (sin) dominated planktic foraminifera can be related to the strengthening of the Atlantic Current. The inflow of the Atlantic Water may have triggered deglaciation of the Fennoscandian Ice Sheet (Bolling interstadial). A rapid increase in illite content, reflecting strong melting of the Fennoscandian Ice Sheet (~15 000 cal yr B.P.), indicates the onset of deglaciation in a core closer to the continent. Decrease of illite and IRD content, together with the deposition of laminated sediments during the Older Dryas stadial (15000-14000 cal yr B.P.) indicates colder conditions and formation of at least seasonal sea-ice. In addition, increased kaolinite content indicates increased glacial erosion of the Bjornoyrenna Ice Stream. The highest values of illite content and increased IRD content (14000-13000 cal yr B.P.) can be related to strong melting of the Fennoscandian Ice Sheet. A slight indication of the Younger Dryas cold period is given by the decrease in illite and IRD contents. All clay contents are more stable during Holocene compared to LGM and the last deglaciation. : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 |
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