Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins
Abstract Continental shelves serve as critical transfer zones in sediment routing systems, linking the terrestrial erosional and deep‐water depositional domains. The degree to which clastic sediment is mixed and homogenised during transfer across broad shelves has important implications for understa...
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Online Access: | https://doi.org/10.1002/dep2.203 https://doaj.org/article/3b97d6dffbab4d9287f4f022e0fd9c9e |
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ftdoajarticles:oai:doaj.org/article:3b97d6dffbab4d9287f4f022e0fd9c9e 2023-05-15T15:43:14+02:00 Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins Matthew A. Malkowski Samuel A. Johnstone Glenn R. Sharman Colin J. White Daniel S. Scheirer Ginger A. Barth 2022-09-01T00:00:00Z https://doi.org/10.1002/dep2.203 https://doaj.org/article/3b97d6dffbab4d9287f4f022e0fd9c9e EN eng Wiley https://doi.org/10.1002/dep2.203 https://doaj.org/toc/2055-4877 2055-4877 doi:10.1002/dep2.203 https://doaj.org/article/3b97d6dffbab4d9287f4f022e0fd9c9e The Depositional Record, Vol 8, Iss 3, Pp 1008-1030 (2022) Bering Sea continental shelves detrital provenance Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.1002/dep2.203 2022-12-30T21:50:57Z Abstract Continental shelves serve as critical transfer zones in sediment routing systems, linking the terrestrial erosional and deep‐water depositional domains. The degree to which clastic sediment is mixed and homogenised during transfer across broad shelves has important implications for understanding deep sea detrital records. Wide continental shelves are thought to act as capacitors characterised by transient sediment storage during sea‐level rise and sediment remobilisation during sea‐level fall. This study attempts to test the hypothesis that sea‐level lowstand yields more efficient and direct sediment transfer from fluvial sources to deep sea sinks compared to highstand when sediment is sequestered and mixed on the shelf. This hypothesis is tested by evaluating U–Pb and Lu–Hf detrital zircon provenance trends along the vast Bering Sea shelf and deep‐marine Beringian continental margin. Presented here are 5884 U–Pb ages and 402 Lu–Hf analyses from 30 samples to characterise the provenance of modern to Pleistocene sediment across the Bering Sea region. Both forward and inverse numerical mixture modelling was used to estimate the abundance of distinct fluvial sources in shelfal and deep‐water deposits. These results demonstrate that sediment in the Bering Sea is derived from a mixture of regional fluvial sources, but that the Yukon River is the primary detrital source for sediment throughout the region. Although Yukon River signatures are abundant in all basin samples, the relative proportions of Yukon River versus other sources vary spatially across the shelf. A comparison of Holocene and surficial sediment with Pleistocene deposits shows that sediment across the shelf and in the deep sea remains well‐mixed between climate states. Thus, detrital provenance signatures in deep‐marine deposits outward of broad transfer zones are likely to represent mixtures of fluvial sources regardless of sea level. Article in Journal/Newspaper Bering Sea Yukon river Yukon Directory of Open Access Journals: DOAJ Articles Yukon Bering Sea The Depositional Record 8 3 1008 1030 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Bering Sea continental shelves detrital provenance Geology QE1-996.5 |
spellingShingle |
Bering Sea continental shelves detrital provenance Geology QE1-996.5 Matthew A. Malkowski Samuel A. Johnstone Glenn R. Sharman Colin J. White Daniel S. Scheirer Ginger A. Barth Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins |
topic_facet |
Bering Sea continental shelves detrital provenance Geology QE1-996.5 |
description |
Abstract Continental shelves serve as critical transfer zones in sediment routing systems, linking the terrestrial erosional and deep‐water depositional domains. The degree to which clastic sediment is mixed and homogenised during transfer across broad shelves has important implications for understanding deep sea detrital records. Wide continental shelves are thought to act as capacitors characterised by transient sediment storage during sea‐level rise and sediment remobilisation during sea‐level fall. This study attempts to test the hypothesis that sea‐level lowstand yields more efficient and direct sediment transfer from fluvial sources to deep sea sinks compared to highstand when sediment is sequestered and mixed on the shelf. This hypothesis is tested by evaluating U–Pb and Lu–Hf detrital zircon provenance trends along the vast Bering Sea shelf and deep‐marine Beringian continental margin. Presented here are 5884 U–Pb ages and 402 Lu–Hf analyses from 30 samples to characterise the provenance of modern to Pleistocene sediment across the Bering Sea region. Both forward and inverse numerical mixture modelling was used to estimate the abundance of distinct fluvial sources in shelfal and deep‐water deposits. These results demonstrate that sediment in the Bering Sea is derived from a mixture of regional fluvial sources, but that the Yukon River is the primary detrital source for sediment throughout the region. Although Yukon River signatures are abundant in all basin samples, the relative proportions of Yukon River versus other sources vary spatially across the shelf. A comparison of Holocene and surficial sediment with Pleistocene deposits shows that sediment across the shelf and in the deep sea remains well‐mixed between climate states. Thus, detrital provenance signatures in deep‐marine deposits outward of broad transfer zones are likely to represent mixtures of fluvial sources regardless of sea level. |
format |
Article in Journal/Newspaper |
author |
Matthew A. Malkowski Samuel A. Johnstone Glenn R. Sharman Colin J. White Daniel S. Scheirer Ginger A. Barth |
author_facet |
Matthew A. Malkowski Samuel A. Johnstone Glenn R. Sharman Colin J. White Daniel S. Scheirer Ginger A. Barth |
author_sort |
Matthew A. Malkowski |
title |
Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins |
title_short |
Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins |
title_full |
Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins |
title_fullStr |
Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins |
title_full_unstemmed |
Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins |
title_sort |
continental shelves as detrital mixers: u–pb and lu–hf detrital zircon provenance of the pleistocene–holocene bering sea and its margins |
publisher |
Wiley |
publishDate |
2022 |
url |
https://doi.org/10.1002/dep2.203 https://doaj.org/article/3b97d6dffbab4d9287f4f022e0fd9c9e |
geographic |
Yukon Bering Sea |
geographic_facet |
Yukon Bering Sea |
genre |
Bering Sea Yukon river Yukon |
genre_facet |
Bering Sea Yukon river Yukon |
op_source |
The Depositional Record, Vol 8, Iss 3, Pp 1008-1030 (2022) |
op_relation |
https://doi.org/10.1002/dep2.203 https://doaj.org/toc/2055-4877 2055-4877 doi:10.1002/dep2.203 https://doaj.org/article/3b97d6dffbab4d9287f4f022e0fd9c9e |
op_doi |
https://doi.org/10.1002/dep2.203 |
container_title |
The Depositional Record |
container_volume |
8 |
container_issue |
3 |
container_start_page |
1008 |
op_container_end_page |
1030 |
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1766377292598083584 |