Holocene sedimentary environment of a High−Arctic fjord in Nordaustlandet, Svalbard
Abstract A2.5−metrelong marine core from Isvika bay inNordaustlandet (80°N, 18°E) was AMS 14 C dated and analysed for its sedimentological and magnetic parameters. The studied record was found to cover the entire Holocene and indicates major turnovers in the palaeo− hydrography and sedimentary depos...
| Published in: | Polish Polar Research |
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| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
Walter de Gruyter GmbH
2014
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.2478/popore-2014-0006 https://content.sciendo.com/view/journals/popore/35/1/article-p73.xml https://www.degruyter.com/view/j/popore.2014.35.issue-1/popore-2014-0006/popore-2014-0006.pdf |
| Summary: | Abstract A2.5−metrelong marine core from Isvika bay inNordaustlandet (80°N, 18°E) was AMS 14 C dated and analysed for its sedimentological and magnetic parameters. The studied record was found to cover the entire Holocene and indicates major turnovers in the palaeo− hydrography and sedimentary depositional history. The area was deglaciated at around 11,300 BP. The earlyHolocene has indications of rapidmelting of glaciers and frequent deposition of ice−rafted debris (IRD). The climatic optimum terminated with a probable glacier re−advance event occurring ca. 5800 cal BP. This event caused the deposition of a diamicton unit in Isvika bay, followed by a shift towards a colder and amore stratified hydrographic set− ting. The reduction in IRD indicates gradual cooling, which led to the stratification of the bay and eventually to more persistent fast sea−ice conditions by 2500 cal BP. For the last 500 years, Isvika has again been seasonally open. |
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