Toward a Holocene sediment budget of the central Kara Sea shelf
High-resolution acoustic data and several sediment gravity cores taken in the Ob and Yenisei estuaries and the central Kara Sea shelf allow us to balance the Holocene sediment budget of the central Kara Sea shelf and to reconstruct the sedimentary history. Cores were radiocarbon dated and linked to...
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ftoceanrep:oai:oceanrep.geomar.de:27402 2023-05-15T14:22:49+02:00 Toward a Holocene sediment budget of the central Kara Sea shelf Dittmers, Klaus Niessen, Frank Stein, Rüdiger 2005 text https://oceanrep.geomar.de/id/eprint/27402/ https://oceanrep.geomar.de/id/eprint/27402/1/2003_Dittmers-etal-Toward_OSM-SEARCH.pdf en eng ARCUS, Arctic Research Consortium of the US https://oceanrep.geomar.de/id/eprint/27402/1/2003_Dittmers-etal-Toward_OSM-SEARCH.pdf Dittmers, K., Niessen, F. and Stein, R. (2005) Toward a Holocene sediment budget of the central Kara Sea shelf. [Poster] In: Open Science Meeting Study of Environmental Arctic Change. , 27.10.-30.10.2003, Seattle, Washington, USA . Proceedings of the Open Science Meeting Study of Environmental Arctic Change, SEARCH. p. 167 . cc_by_nc Conference or Workshop Item PeerReviewed 2005 ftoceanrep 2023-04-07T15:17:31Z High-resolution acoustic data and several sediment gravity cores taken in the Ob and Yenisei estuaries and the central Kara Sea shelf allow us to balance the Holocene sediment budget of the central Kara Sea shelf and to reconstruct the sedimentary history. Cores were radiocarbon dated and linked to acoustic profiles using whole-core physical properties. The Ob and Yenisei estuaries, with their sea water fresh water mixing zone, act as major sediment sinks for fluvial derived terrigeneous material in Holocene times. Most of the suspended and large amounts of dissolved matter precipitate in this zone termed “marginal filter”. High thickness of Holocene sediments occurs between 72°N and 73°30`N where a distinct decrease in thickness is observed to the north. Two major acoustic Units could be differentiated, separated by a prominent reflector interpreted as the base of the Holocene. High-resolution echosound data suggest a fluvial dominated depositional environment for the early Holocene displaying lateral accretion as point bars and vertical accreted overbank deposits in a fluvial channel-levee-complex. During the early Holocene sea-level rise the marginal filter migrated progressively southward (upstream) to its present position forming a typical high-stand system tract in acoustic images. Estuarine sedimentation in a sedimentary environment similar to today started at approximately 5 Cal. kyrs. BP. An estimated total of 14.3 * 1010 t and 9.2 * 1010 t of fine-grained brackish-marine sediments, in the Ob and Yenisei estuaries, respectively, were accumulated during Holocene times. This is only about 75 % and about 50 % of Ob and Yenisei estuarine sediment budgets, respectively, estimated by extrapolation of recent river run-off data over the last 7500 years. Filled paleoriver channels indicate active river incision in the southern part of the Kara Sea shelf prior to the Holocene. New Parasound data obtained during the recent (2003) cruise of RV “Boris Petrov” and the interpretation of the existing data allow a first ... Conference Object Arctic Kara Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Kara Sea |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
High-resolution acoustic data and several sediment gravity cores taken in the Ob and Yenisei estuaries and the central Kara Sea shelf allow us to balance the Holocene sediment budget of the central Kara Sea shelf and to reconstruct the sedimentary history. Cores were radiocarbon dated and linked to acoustic profiles using whole-core physical properties. The Ob and Yenisei estuaries, with their sea water fresh water mixing zone, act as major sediment sinks for fluvial derived terrigeneous material in Holocene times. Most of the suspended and large amounts of dissolved matter precipitate in this zone termed “marginal filter”. High thickness of Holocene sediments occurs between 72°N and 73°30`N where a distinct decrease in thickness is observed to the north. Two major acoustic Units could be differentiated, separated by a prominent reflector interpreted as the base of the Holocene. High-resolution echosound data suggest a fluvial dominated depositional environment for the early Holocene displaying lateral accretion as point bars and vertical accreted overbank deposits in a fluvial channel-levee-complex. During the early Holocene sea-level rise the marginal filter migrated progressively southward (upstream) to its present position forming a typical high-stand system tract in acoustic images. Estuarine sedimentation in a sedimentary environment similar to today started at approximately 5 Cal. kyrs. BP. An estimated total of 14.3 * 1010 t and 9.2 * 1010 t of fine-grained brackish-marine sediments, in the Ob and Yenisei estuaries, respectively, were accumulated during Holocene times. This is only about 75 % and about 50 % of Ob and Yenisei estuarine sediment budgets, respectively, estimated by extrapolation of recent river run-off data over the last 7500 years. Filled paleoriver channels indicate active river incision in the southern part of the Kara Sea shelf prior to the Holocene. New Parasound data obtained during the recent (2003) cruise of RV “Boris Petrov” and the interpretation of the existing data allow a first ... |
format |
Conference Object |
author |
Dittmers, Klaus Niessen, Frank Stein, Rüdiger |
spellingShingle |
Dittmers, Klaus Niessen, Frank Stein, Rüdiger Toward a Holocene sediment budget of the central Kara Sea shelf |
author_facet |
Dittmers, Klaus Niessen, Frank Stein, Rüdiger |
author_sort |
Dittmers, Klaus |
title |
Toward a Holocene sediment budget of the central Kara Sea shelf |
title_short |
Toward a Holocene sediment budget of the central Kara Sea shelf |
title_full |
Toward a Holocene sediment budget of the central Kara Sea shelf |
title_fullStr |
Toward a Holocene sediment budget of the central Kara Sea shelf |
title_full_unstemmed |
Toward a Holocene sediment budget of the central Kara Sea shelf |
title_sort |
toward a holocene sediment budget of the central kara sea shelf |
publisher |
ARCUS, Arctic Research Consortium of the US |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/27402/ https://oceanrep.geomar.de/id/eprint/27402/1/2003_Dittmers-etal-Toward_OSM-SEARCH.pdf |
geographic |
Kara Sea |
geographic_facet |
Kara Sea |
genre |
Arctic Kara Sea |
genre_facet |
Arctic Kara Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/27402/1/2003_Dittmers-etal-Toward_OSM-SEARCH.pdf Dittmers, K., Niessen, F. and Stein, R. (2005) Toward a Holocene sediment budget of the central Kara Sea shelf. [Poster] In: Open Science Meeting Study of Environmental Arctic Change. , 27.10.-30.10.2003, Seattle, Washington, USA . Proceedings of the Open Science Meeting Study of Environmental Arctic Change, SEARCH. p. 167 . |
op_rights |
cc_by_nc |
_version_ |
1766295327580618752 |