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Plio-Pleistocene sedimentary record from the Northwind Ridge: new insights into paleoclimatic evolution of the western Arctic Ocean for the last 5 Ma

Plio-Pleistocene sedimentary record from the Northwind Ridge: new insights into paleoclimatic evolution of the western Arctic Ocean for the last 5 Ma
Plio-Pleistocene sedimentary record from the Northwind Ridge: new insights into paleoclimatic evolution of the western Arctic Ocean for the last 5 Ma
Sediment core HLY0503-03JPC from the top of the Northwind Ridge provides the first confirmed Plio-Pleistocene record from the western Arctic Ocean, with calcareous microfossils uniquely preserved to ca. 5 Ma. Results are compared to nearby core P1-93AR-P23 from the ridge slope, which was previously used to reconstruct early Quaternary sea-ice conditions in the region (Polyak et al. in Quat Sci Rev 79:145–156, 2013), and is now re-dated to at least the late Pliocene. Ages were estimated primarily from strontium isotope stratigraphy on benthic foraminifers. Based on multiple physical, paleomagnetic, elemental geochemical, and paleobiological (foraminifers) proxies, we identify three major stratigraphic divisions (Units 1, 2a, and 2b) roughly representing upper to middle (“glacial”) Quaternary, lower Quaternary to Pliocene, and lower Pliocene to possibly upper Miocene (undated). Benthic foraminiferal assemblages were utilized to evaluate paleo-sea-ice conditions, while other proxies were used to interpret paleocirculation and sediment transport processes. Early Quaternary and older sediments indicate diminutive effect from glaciations, reduced sea-ice conditions, and a periodic strong current impact on the ridge top, possibly due to an enhanced Atlantic water flow. Ages derived from the first foraminiferal tests appearing at ca. 5 Ma likely indicate a redeposition pulse that we attribute to the onset of Pacific water throughflow via the Bering Strait. A large hiatus above this level in JPC3 spans most of the Pliocene. The Unit 2a/1 boundary, estimated to ca. 0.8 Ma, is marked by an abrupt faunal and sedimentary change, which is consistent with the major climatic shift that occurred during this time (Mid-Pleistocene Transition). Unit 1 exhibits a strong control from glacial cyclicity, with a progressive expansion of the Laurentide Ice Sheet primarily affecting the study region, and mostly perennial sea-ice conditions. Overall results suggest that the Pliocene and early Pleistocene may provide relevant paleoclimatic analogs for the rapidly changing Arctic environments of today.
2364-9453
Dipre, Geoffrey R.
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Polyak, Leonid
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Kuznetsov, Anton B.
00eb1ee6-67b2-4589-947e-9d88f1a4bcc6
Oti, Emma A.
d3bef261-3ab5-4a74-a947-2881b0fcee55
Ortiz, Joseph D.
804f8306-251e-4212-95bb-03ed00197741
Brachfeld, Stefanie A.
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Xuan, Chuang
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Lazar, Kelly B.
799a4864-44c2-4015-bd1a-12b8b40b8827
Cook, Ann E.
77b69fb5-7611-480a-b3d9-2a9f0862cb52
Dipre, Geoffrey R.
40d08e96-89b4-499b-839a-132132f7b441
Polyak, Leonid
d98748c7-21e7-4850-9ce4-d6cacdb7ba50
Kuznetsov, Anton B.
00eb1ee6-67b2-4589-947e-9d88f1a4bcc6
Oti, Emma A.
d3bef261-3ab5-4a74-a947-2881b0fcee55
Ortiz, Joseph D.
804f8306-251e-4212-95bb-03ed00197741
Brachfeld, Stefanie A.
314d0965-0e13-4097-9684-6a2057d20af4
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Lazar, Kelly B.
799a4864-44c2-4015-bd1a-12b8b40b8827
Cook, Ann E.
77b69fb5-7611-480a-b3d9-2a9f0862cb52

Dipre, Geoffrey R., Polyak, Leonid, Kuznetsov, Anton B., Oti, Emma A., Ortiz, Joseph D., Brachfeld, Stefanie A., Xuan, Chuang, Lazar, Kelly B. and Cook, Ann E. (2018) Plio-Pleistocene sedimentary record from the Northwind Ridge: new insights into paleoclimatic evolution of the western Arctic Ocean for the last 5 Ma. arktos, 4 (1), [24]. (doi:10.1007/s41063-018-0054-y).

Record type: Article

Abstract

Sediment core HLY0503-03JPC from the top of the Northwind Ridge provides the first confirmed Plio-Pleistocene record from the western Arctic Ocean, with calcareous microfossils uniquely preserved to ca. 5 Ma. Results are compared to nearby core P1-93AR-P23 from the ridge slope, which was previously used to reconstruct early Quaternary sea-ice conditions in the region (Polyak et al. in Quat Sci Rev 79:145–156, 2013), and is now re-dated to at least the late Pliocene. Ages were estimated primarily from strontium isotope stratigraphy on benthic foraminifers. Based on multiple physical, paleomagnetic, elemental geochemical, and paleobiological (foraminifers) proxies, we identify three major stratigraphic divisions (Units 1, 2a, and 2b) roughly representing upper to middle (“glacial”) Quaternary, lower Quaternary to Pliocene, and lower Pliocene to possibly upper Miocene (undated). Benthic foraminiferal assemblages were utilized to evaluate paleo-sea-ice conditions, while other proxies were used to interpret paleocirculation and sediment transport processes. Early Quaternary and older sediments indicate diminutive effect from glaciations, reduced sea-ice conditions, and a periodic strong current impact on the ridge top, possibly due to an enhanced Atlantic water flow. Ages derived from the first foraminiferal tests appearing at ca. 5 Ma likely indicate a redeposition pulse that we attribute to the onset of Pacific water throughflow via the Bering Strait. A large hiatus above this level in JPC3 spans most of the Pliocene. The Unit 2a/1 boundary, estimated to ca. 0.8 Ma, is marked by an abrupt faunal and sedimentary change, which is consistent with the major climatic shift that occurred during this time (Mid-Pleistocene Transition). Unit 1 exhibits a strong control from glacial cyclicity, with a progressive expansion of the Laurentide Ice Sheet primarily affecting the study region, and mostly perennial sea-ice conditions. Overall results suggest that the Pliocene and early Pleistocene may provide relevant paleoclimatic analogs for the rapidly changing Arctic environments of today.

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More information

Accepted/In Press date: 12 June 2018
e-pub ahead of print date: 27 August 2018
Published date: 1 December 2018

Identifiers

Local EPrints ID: 427811
URI: http://eprints.soton.ac.uk/id/eprint/427811
ISSN: 2364-9453
PURE UUID: 08ab0a88-a362-41a0-9a0c-57c3537f633f
ORCID for Chuang Xuan: ORCID iD orcid.org/0000-0003-4043-3073

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Date deposited: 29 Jan 2019 17:30
Last modified: 18 Feb 2021 17:22

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Contributors

Author: Geoffrey R. Dipre
Author: Leonid Polyak
Author: Anton B. Kuznetsov
Author: Emma A. Oti
Author: Joseph D. Ortiz
Author: Stefanie A. Brachfeld
Author: Chuang Xuan ORCID iD
Author: Kelly B. Lazar
Author: Ann E. Cook

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