Glacial-interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing
A large sediment deposit known as the Meiji Drift, located in the northwestern Pacific Ocean, is thought to have formed from deep water exiting the Bering Sea, although no notable deep water forms there presently. We determine the terrigenous sources since 140 ka to the drift using bulk sediment 40A...
Published in: | Earth and Planetary Science Letters |
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1451 2023-06-11T04:10:39+02:00 Glacial-interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing VanLaningham, Sam Pisias, Nicklas G. Duncan, Robert A. Clift, Peter D. 2009-01-15T08:00:00Z https://digitalcommons.lsu.edu/geo_pubs/452 https://doi.org/10.1016/j.epsl.2008.09.033 unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/452 doi:10.1016/j.epsl.2008.09.033 Faculty Publications 40 39 Ar- Ar ages Bering Sea Chukchi Sea contourite Detroit Seamount Kamchatka Strait mid-Pleistocene transition Nd isotopes ODP Site 884 provenance thermohaline circulation Yukon River text 2009 ftlouisianastuir https://doi.org/10.1016/j.epsl.2008.09.033 2023-05-28T18:16:53Z A large sediment deposit known as the Meiji Drift, located in the northwestern Pacific Ocean, is thought to have formed from deep water exiting the Bering Sea, although no notable deep water forms there presently. We determine the terrigenous sources since 140 ka to the drift using bulk sediment 40Ar-39Ar and Nd isotopic analyses on the silt-sized (20-63 μm) terrigenous fraction from Ocean Drilling Program (ODP) Site 884 to reconstruct paleo-circulation patterns. There are large changes in both isotopic tracers, varying on glacial-interglacial cycles. During glacial intervals, bulk sediment 40Ar-39Ar ages range between 40 and 80 Ma, while Nd isotopic values range from εNd = - 1 to + 2. During interglacial intervals, sediments become much younger and more radiogenic, with bulk sediment ages falling to 2-15 Ma and Nd isotopic values ranging between εNd = + 5 and + 9. These data and quantitative comparison to potential source rocks indicate that the young Kamchatkan and Aleutian Arcs, lying NW and NE of the Meiji Drift, contribute the majority of sediment during interglacials. Conversely, older source rocks, such as those drained by the Yukon River and northeast Russia are the dominant origin of sediments during glacials. Mixing model calculations suggest that as much as 35-45% of the sediment deposited in the Meiji Drift during glacials is from the Bering Sea. It remains unclear whether thermohaline-type circulation or focussing of Bering Sea flow lead to the glacial-interglacial sediment source changes observed here. © 2008 Elsevier B.V. All rights reserved. Text Bering Sea Chukchi Chukchi Sea Kamchatka Yukon river Yukon LSU Digital Commons (Louisiana State University) Yukon Bering Sea Chukchi Sea Pacific Detroit ENVELOPE(-60.000,-60.000,-64.167,-64.167) Earth and Planetary Science Letters 277 1-2 64 72 |
institution |
Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
topic |
40 39 Ar- Ar ages Bering Sea Chukchi Sea contourite Detroit Seamount Kamchatka Strait mid-Pleistocene transition Nd isotopes ODP Site 884 provenance thermohaline circulation Yukon River |
spellingShingle |
40 39 Ar- Ar ages Bering Sea Chukchi Sea contourite Detroit Seamount Kamchatka Strait mid-Pleistocene transition Nd isotopes ODP Site 884 provenance thermohaline circulation Yukon River VanLaningham, Sam Pisias, Nicklas G. Duncan, Robert A. Clift, Peter D. Glacial-interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing |
topic_facet |
40 39 Ar- Ar ages Bering Sea Chukchi Sea contourite Detroit Seamount Kamchatka Strait mid-Pleistocene transition Nd isotopes ODP Site 884 provenance thermohaline circulation Yukon River |
description |
A large sediment deposit known as the Meiji Drift, located in the northwestern Pacific Ocean, is thought to have formed from deep water exiting the Bering Sea, although no notable deep water forms there presently. We determine the terrigenous sources since 140 ka to the drift using bulk sediment 40Ar-39Ar and Nd isotopic analyses on the silt-sized (20-63 μm) terrigenous fraction from Ocean Drilling Program (ODP) Site 884 to reconstruct paleo-circulation patterns. There are large changes in both isotopic tracers, varying on glacial-interglacial cycles. During glacial intervals, bulk sediment 40Ar-39Ar ages range between 40 and 80 Ma, while Nd isotopic values range from εNd = - 1 to + 2. During interglacial intervals, sediments become much younger and more radiogenic, with bulk sediment ages falling to 2-15 Ma and Nd isotopic values ranging between εNd = + 5 and + 9. These data and quantitative comparison to potential source rocks indicate that the young Kamchatkan and Aleutian Arcs, lying NW and NE of the Meiji Drift, contribute the majority of sediment during interglacials. Conversely, older source rocks, such as those drained by the Yukon River and northeast Russia are the dominant origin of sediments during glacials. Mixing model calculations suggest that as much as 35-45% of the sediment deposited in the Meiji Drift during glacials is from the Bering Sea. It remains unclear whether thermohaline-type circulation or focussing of Bering Sea flow lead to the glacial-interglacial sediment source changes observed here. © 2008 Elsevier B.V. All rights reserved. |
format |
Text |
author |
VanLaningham, Sam Pisias, Nicklas G. Duncan, Robert A. Clift, Peter D. |
author_facet |
VanLaningham, Sam Pisias, Nicklas G. Duncan, Robert A. Clift, Peter D. |
author_sort |
VanLaningham, Sam |
title |
Glacial-interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing |
title_short |
Glacial-interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing |
title_full |
Glacial-interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing |
title_fullStr |
Glacial-interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing |
title_full_unstemmed |
Glacial-interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing |
title_sort |
glacial-interglacial sediment transport to the meiji drift, northwest pacific ocean: evidence for timing of beringian outwashing |
publisher |
LSU Digital Commons |
publishDate |
2009 |
url |
https://digitalcommons.lsu.edu/geo_pubs/452 https://doi.org/10.1016/j.epsl.2008.09.033 |
long_lat |
ENVELOPE(-60.000,-60.000,-64.167,-64.167) |
geographic |
Yukon Bering Sea Chukchi Sea Pacific Detroit |
geographic_facet |
Yukon Bering Sea Chukchi Sea Pacific Detroit |
genre |
Bering Sea Chukchi Chukchi Sea Kamchatka Yukon river Yukon |
genre_facet |
Bering Sea Chukchi Chukchi Sea Kamchatka Yukon river Yukon |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/452 doi:10.1016/j.epsl.2008.09.033 |
op_doi |
https://doi.org/10.1016/j.epsl.2008.09.033 |
container_title |
Earth and Planetary Science Letters |
container_volume |
277 |
container_issue |
1-2 |
container_start_page |
64 |
op_container_end_page |
72 |
_version_ |
1768385184724418560 |