Sedimentary facies of glacial-interglacial cycles in the Norwegian Sea during the last 350 ka
Sediment fluxes were highest in the Norwegian Sea during late glacial/early deglacial periods, i.e., at oxygen isotope transition 43, below transition 65, at various levels within stage 6, and below stage 9. Dark diamictons deposited at these times reflect intense iceberg rafting in surface waters f...
| Published in: | Marine Geology |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Elsevier
1989
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| Subjects: | |
| Online Access: | https://oceanrep.geomar.de/id/eprint/26913/ https://oceanrep.geomar.de/id/eprint/26913/1/1989_Henrich-etal-Sedimentary_MarGeol-86.pdf http://ac.els-cdn.com/002532278990090X/1-s2.0-002532278990090X-main.pdf?_tid=03ea235c-9afd-11e4-81fc-00000aacb35d&acdnat=1421137401_930c82608f068a7f9c65b4d0c4cdb09f https://doi.org/10.1016/0025-3227(89)90090-X |
| Summary: | Sediment fluxes were highest in the Norwegian Sea during late glacial/early deglacial periods, i.e., at oxygen isotope transition 43, below transition 65, at various levels within stage 6, and below stage 9. Dark diamictons deposited at these times reflect intense iceberg rafting in surface waters fed by surges along the front of the marine-based parts of the continental ice sheets in the southeastern sector of the Norwegian Sea. The high organic carbon content (0.5–1.3%) in these layers reflects input from erosion of terrigenious matter-rich sediments outcropping on the shelves. Partial oxidation of organic matter and decreased deep-water renewal may explain the strong carbonate dissolution observed during these periods. Interglacial environments were strongly variable throughout the last 350 ka. Circulation patterns of stage 5e best resemble modern conditions, while stage 7 and 9 sediments record a much weaker Norwegian Current. |
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