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Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation

Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation
Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation

We present new sedimentological and environmental magnetic records spanning ∼3.2–2.2 Ma, during the intensification of Northern Hemisphere glaciation, from North Atlantic Integrated Ocean Drilling Program Site U1307 on Eirik Drift. Our new datasets and their high-fidelity age control demonstrate that while inland glaciers – and potentially also at times restricted iceberg-calving margins – have likely existed on southern Greenland since at least ∼3.2 Ma, persistent and extensive iceberg-calving glacial margins were only established in this region at 2.72 Ma, ∼300 kyr later than in northeastern and eastern Greenland. Despite a dramatic increase in Greenland-sourced ice-rafted debris deposition on Eirik Drift at this time, contemporaneous changes in the bulk magnetic properties of Site U1307 sediments, and a reduction in sediment accumulation rates, suggest a decrease in the delivery of Greenland-sourced glaciofluvial silt to our study site. We attribute these changes to a shift in depositional regime from bottom-current-dominated to glacial-IRD-dominated between ∼2.9 and 2.7 Ma, in response to a change in the depth of the flow path of the Western Boundary Undercurrent relative to our study site.

Greenland Ice Sheet, Ice-rafted debris, North Atlantic, Northern Hemisphere glaciation, Paleoceanography, Paleoclimatology, Paleomagnetism, Plio-Pleistocene transition, Relative paleointensity
0277-3791
40-51
Blake-Mizen, Keziah
25d2ab9a-ec2d-4d68-961a-37633f6b5c43
Hatfield, Robert G.
47e37d03-423d-4566-a7ef-3a8e9c7de57d
Stoner, Joseph S.
07fdf2db-cd5b-4d16-a148-c3cf67a1aaf8
Carlson, Anders E.
5bb4b0d2-3ec6-4004-8067-258c32a34453
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Walczak, Maureen
e3eb169e-9471-44bc-8d7a-6217a6603d23
Lawrence, Kira T.
4969730c-a5f4-4a99-87ec-13b229cbb58f
Channell, James E.T.
55b6c1cc-76e7-4ca5-8186-d9111b9b5158
Bailey, Ian
e659068f-e591-4185-afd1-5e19a5794bda
Blake-Mizen, Keziah
25d2ab9a-ec2d-4d68-961a-37633f6b5c43
Hatfield, Robert G.
47e37d03-423d-4566-a7ef-3a8e9c7de57d
Stoner, Joseph S.
07fdf2db-cd5b-4d16-a148-c3cf67a1aaf8
Carlson, Anders E.
5bb4b0d2-3ec6-4004-8067-258c32a34453
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Walczak, Maureen
e3eb169e-9471-44bc-8d7a-6217a6603d23
Lawrence, Kira T.
4969730c-a5f4-4a99-87ec-13b229cbb58f
Channell, James E.T.
55b6c1cc-76e7-4ca5-8186-d9111b9b5158
Bailey, Ian
e659068f-e591-4185-afd1-5e19a5794bda

Blake-Mizen, Keziah, Hatfield, Robert G., Stoner, Joseph S., Carlson, Anders E., Xuan, Chuang, Walczak, Maureen, Lawrence, Kira T., Channell, James E.T. and Bailey, Ian (2019) Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation. Quaternary Science Reviews, 209, 40-51. (doi:10.1016/j.quascirev.2019.01.015).

Record type: Article

Abstract

We present new sedimentological and environmental magnetic records spanning ∼3.2–2.2 Ma, during the intensification of Northern Hemisphere glaciation, from North Atlantic Integrated Ocean Drilling Program Site U1307 on Eirik Drift. Our new datasets and their high-fidelity age control demonstrate that while inland glaciers – and potentially also at times restricted iceberg-calving margins – have likely existed on southern Greenland since at least ∼3.2 Ma, persistent and extensive iceberg-calving glacial margins were only established in this region at 2.72 Ma, ∼300 kyr later than in northeastern and eastern Greenland. Despite a dramatic increase in Greenland-sourced ice-rafted debris deposition on Eirik Drift at this time, contemporaneous changes in the bulk magnetic properties of Site U1307 sediments, and a reduction in sediment accumulation rates, suggest a decrease in the delivery of Greenland-sourced glaciofluvial silt to our study site. We attribute these changes to a shift in depositional regime from bottom-current-dominated to glacial-IRD-dominated between ∼2.9 and 2.7 Ma, in response to a change in the depth of the flow path of the Western Boundary Undercurrent relative to our study site.

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Blake-Mizen et al. 2019 Quaternary Science Reviews_sent to Debbie B - Accepted Manuscript
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More information

Accepted/In Press date: 26 January 2019
e-pub ahead of print date: 26 February 2019
Published date: 1 April 2019
Keywords: Greenland Ice Sheet, Ice-rafted debris, North Atlantic, Northern Hemisphere glaciation, Paleoceanography, Paleoclimatology, Paleomagnetism, Plio-Pleistocene transition, Relative paleointensity

Identifiers

Local EPrints ID: 428614
URI: http://eprints.soton.ac.uk/id/eprint/428614
ISSN: 0277-3791
PURE UUID: a386c198-388c-49f1-b613-a1c928ec7aea
ORCID for Chuang Xuan: ORCID iD orcid.org/0000-0003-4043-3073

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Date deposited: 05 Mar 2019 17:30
Last modified: 18 Feb 2021 17:22

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Contributors

Author: Keziah Blake-Mizen
Author: Robert G. Hatfield
Author: Joseph S. Stoner
Author: Anders E. Carlson
Author: Chuang Xuan ORCID iD
Author: Maureen Walczak
Author: Kira T. Lawrence
Author: James E.T. Channell
Author: Ian Bailey

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