Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift
In locations of rapid sediment accumulation receiving substantial amounts of laterally transported material the timescales of transport and accurate quantification of the transportedmaterial are at the focus of intense research. Here we present radiocarbon data obtained on co-occurring planktic fora...
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Online Access: | https://epic.awi.de/id/eprint/25271/ https://epic.awi.de/id/eprint/25271/1/Mollenhauer_et_al_2011.pdf https://hdl.handle.net/10013/epic.39130 https://hdl.handle.net/10013/epic.39130.d001 |
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ftawi:oai:epic.awi.de:25271 2024-09-15T18:23:49+00:00 Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift Mollenhauer, Gesine McManus, J. F. Wagner, Thomas McCave, I. Nick Eglinton, T. I. 2011 application/pdf https://epic.awi.de/id/eprint/25271/ https://epic.awi.de/id/eprint/25271/1/Mollenhauer_et_al_2011.pdf https://hdl.handle.net/10013/epic.39130 https://hdl.handle.net/10013/epic.39130.d001 unknown ELSEVIER SCIENCE BV https://epic.awi.de/id/eprint/25271/1/Mollenhauer_et_al_2011.pdf https://hdl.handle.net/10013/epic.39130.d001 Mollenhauer, G. orcid:0000-0001-5138-564X , McManus, J. F. , Wagner, T. , McCave, I. N. and Eglinton, T. I. (2011) Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift , Earth and Planetary Science Letters, 301 , pp. 373-381 . doi:10.1016/j.epsl.2010.11.022 <https://doi.org/10.1016/j.epsl.2010.11.022> , hdl:10013/epic.39130 EPIC3Earth and Planetary Science Letters, ELSEVIER SCIENCE BV, 301, pp. 373-381, ISSN: 0012-821X Article isiRev 2011 ftawi https://doi.org/10.1016/j.epsl.2010.11.022 2024-06-24T04:03:41Z In locations of rapid sediment accumulation receiving substantial amounts of laterally transported material the timescales of transport and accurate quantification of the transportedmaterial are at the focus of intense research. Here we present radiocarbon data obtained on co-occurring planktic foraminifera, marine haptophyte biomarkers (alkenones) and total organic carbon (TOC) coupled with excess Thorium-230 (230Thxs)measurements on four sediment cores retrieved in 1649–2879 mwater depth fromtwo such high accumulation drift deposits in the Northeast Atlantic, Björn and Gardar Drifts.While 230Thxs inventories imply strong sediment focussing, no age offsets are observed between planktic foraminifera and alkenones, suggesting that redistribution of sediments is rapid and occurs soon after formation ofmarine organic matter, or that transported material contains negligible amounts of alkenones. An isotopic mass balance calculation based on radiocarbon concentrations of co-occurring sediment components leads us to estimate that transported sediment components contain up to 12% of fossil organic matter that is free of or very poor in alkenones, but nevertheless appears to consist of a mixture of fresh and eroded fossil material. Considering all available constraints to characterize transported material, our results showthat although focussing factors calculated frombulk sediment 230Thxs inventoriesmay allowuseful approximations of bulk redeposition, they do not provide a unique estimate of the amount of each laterally transported sediment component. Furthermore, our findings provide evidence that the occurrence of lateral sediment redistribution alone does not always hinder the use ofmultiple proxies but that individual sediment fractions are affected to variable extents by sediment focussing. Article in Journal/Newspaper North Atlantic Northeast Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Earth and Planetary Science Letters 301 1-2 373 381 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
In locations of rapid sediment accumulation receiving substantial amounts of laterally transported material the timescales of transport and accurate quantification of the transportedmaterial are at the focus of intense research. Here we present radiocarbon data obtained on co-occurring planktic foraminifera, marine haptophyte biomarkers (alkenones) and total organic carbon (TOC) coupled with excess Thorium-230 (230Thxs)measurements on four sediment cores retrieved in 1649–2879 mwater depth fromtwo such high accumulation drift deposits in the Northeast Atlantic, Björn and Gardar Drifts.While 230Thxs inventories imply strong sediment focussing, no age offsets are observed between planktic foraminifera and alkenones, suggesting that redistribution of sediments is rapid and occurs soon after formation ofmarine organic matter, or that transported material contains negligible amounts of alkenones. An isotopic mass balance calculation based on radiocarbon concentrations of co-occurring sediment components leads us to estimate that transported sediment components contain up to 12% of fossil organic matter that is free of or very poor in alkenones, but nevertheless appears to consist of a mixture of fresh and eroded fossil material. Considering all available constraints to characterize transported material, our results showthat although focussing factors calculated frombulk sediment 230Thxs inventoriesmay allowuseful approximations of bulk redeposition, they do not provide a unique estimate of the amount of each laterally transported sediment component. Furthermore, our findings provide evidence that the occurrence of lateral sediment redistribution alone does not always hinder the use ofmultiple proxies but that individual sediment fractions are affected to variable extents by sediment focussing. |
format |
Article in Journal/Newspaper |
author |
Mollenhauer, Gesine McManus, J. F. Wagner, Thomas McCave, I. Nick Eglinton, T. I. |
spellingShingle |
Mollenhauer, Gesine McManus, J. F. Wagner, Thomas McCave, I. Nick Eglinton, T. I. Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift |
author_facet |
Mollenhauer, Gesine McManus, J. F. Wagner, Thomas McCave, I. Nick Eglinton, T. I. |
author_sort |
Mollenhauer, Gesine |
title |
Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift |
title_short |
Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift |
title_full |
Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift |
title_fullStr |
Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift |
title_full_unstemmed |
Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift |
title_sort |
radiocarbon and 230th data reveal rapid redistribution and temporal changes in sediment focussing at a north atlantic drift |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2011 |
url |
https://epic.awi.de/id/eprint/25271/ https://epic.awi.de/id/eprint/25271/1/Mollenhauer_et_al_2011.pdf https://hdl.handle.net/10013/epic.39130 https://hdl.handle.net/10013/epic.39130.d001 |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_source |
EPIC3Earth and Planetary Science Letters, ELSEVIER SCIENCE BV, 301, pp. 373-381, ISSN: 0012-821X |
op_relation |
https://epic.awi.de/id/eprint/25271/1/Mollenhauer_et_al_2011.pdf https://hdl.handle.net/10013/epic.39130.d001 Mollenhauer, G. orcid:0000-0001-5138-564X , McManus, J. F. , Wagner, T. , McCave, I. N. and Eglinton, T. I. (2011) Radiocarbon and 230Th data reveal rapid redistribution and temporal changes in sediment focussing at a North Atlantic drift , Earth and Planetary Science Letters, 301 , pp. 373-381 . doi:10.1016/j.epsl.2010.11.022 <https://doi.org/10.1016/j.epsl.2010.11.022> , hdl:10013/epic.39130 |
op_doi |
https://doi.org/10.1016/j.epsl.2010.11.022 |
container_title |
Earth and Planetary Science Letters |
container_volume |
301 |
container_issue |
1-2 |
container_start_page |
373 |
op_container_end_page |
381 |
_version_ |
1810464089350078464 |