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Late Quaternary stratigraphy and sedimentation patterns in the western Arctic Ocean

Late Quaternary stratigraphy and sedimentation patterns in the western Arctic Ocean
Late Quaternary stratigraphy and sedimentation patterns in the western Arctic Ocean
Sediment cores from the western Arctic Ocean obtained on the 2005 HOTRAX and some earlier expeditions have been analyzed to develop a stratigraphic correlation from the Alaskan Chukchi margin to the Northwind and Mendeleev–Alpha ridges. The correlation was primarily based on terrigenous sediment composition that is not affected by diagenetic processes as strongly as the biogenic component, and paleomagnetic inclination records. Chronostratigraphic control was provided by 14C dating and amino-acid racemization ages, as well as correlation to earlier established Arctic Ocean stratigraphies. Distribution of sedimentary units across the western Arctic indicates that sedimentation rates decrease from tens of centimeters per kyr on the Alaskan margin to a few centimeters on the southern ends of Northwind and Mendeleev ridges and just a few millimeters on the ridges in the interior of the Amerasia basin. This sedimentation pattern suggests that Late Quaternary sediment transport and deposition, except for turbidites at the basin bottom, were generally controlled by ice concentration (and thus melt-out rate) and transportation distance from sources, with local variances related to subsurface currents. In the long term, most sediment was probably delivered to the core sites by icebergs during glacial periods, with a significant contribution from sea ice. During glacial maxima very fine-grained sediment was deposited with sedimentation rates greatly reduced away from the margins to a hiatus of several kyr duration as shown for the Last Glacial Maximum. This sedimentary environment was possibly related to a very solid ice cover and reduced melt-out over a large part of the western Arctic Ocean.
arctic ocean, sediment stratigraphy, sedimentary environments, late quaternary, glaciations
0921-8181
5-17
Polyak, Leonid
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Bischof, Jens
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Ortiz, Joseph D.
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Darby, Dennis A.
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Channell, James E.T.
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Xuan, Chuang
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Kaufman, Darrell S.
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Løvlie, Reidar
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Schneider, David A.
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Eberl, Dennis D.
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Adler, Ruth E.
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Council, Edward A.
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Polyak, Leonid
d98748c7-21e7-4850-9ce4-d6cacdb7ba50
Bischof, Jens
0b5a608a-1b65-4d60-ae42-e9904d73fc82
Ortiz, Joseph D.
804f8306-251e-4212-95bb-03ed00197741
Darby, Dennis A.
76289b79-cbea-45f0-bf14-10177bf26b7b
Channell, James E.T.
55b6c1cc-76e7-4ca5-8186-d9111b9b5158
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Kaufman, Darrell S.
3b636f4b-85a3-4327-8e92-5da206565ac6
Løvlie, Reidar
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Schneider, David A.
c55c78c3-28d4-4ad2-8ba6-7ff43971d16e
Eberl, Dennis D.
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Adler, Ruth E.
fbe774bb-1577-4d0d-9c3f-5712beca37fd
Council, Edward A.
6f506dfb-0c1f-4c90-9eb1-15ecadc00dae

Polyak, Leonid, Bischof, Jens, Ortiz, Joseph D., Darby, Dennis A., Channell, James E.T., Xuan, Chuang, Kaufman, Darrell S., Løvlie, Reidar, Schneider, David A., Eberl, Dennis D., Adler, Ruth E. and Council, Edward A. (2009) Late Quaternary stratigraphy and sedimentation patterns in the western Arctic Ocean [in special issue: The 2005 HOTRAX Expedition to the Arctic Ocean] Global and Planetary Change, 68, (1-2), pp. 5-17. (doi:10.1016/j.gloplacha.2009.03.014).

Record type: Article

Abstract

Sediment cores from the western Arctic Ocean obtained on the 2005 HOTRAX and some earlier expeditions have been analyzed to develop a stratigraphic correlation from the Alaskan Chukchi margin to the Northwind and Mendeleev–Alpha ridges. The correlation was primarily based on terrigenous sediment composition that is not affected by diagenetic processes as strongly as the biogenic component, and paleomagnetic inclination records. Chronostratigraphic control was provided by 14C dating and amino-acid racemization ages, as well as correlation to earlier established Arctic Ocean stratigraphies. Distribution of sedimentary units across the western Arctic indicates that sedimentation rates decrease from tens of centimeters per kyr on the Alaskan margin to a few centimeters on the southern ends of Northwind and Mendeleev ridges and just a few millimeters on the ridges in the interior of the Amerasia basin. This sedimentation pattern suggests that Late Quaternary sediment transport and deposition, except for turbidites at the basin bottom, were generally controlled by ice concentration (and thus melt-out rate) and transportation distance from sources, with local variances related to subsurface currents. In the long term, most sediment was probably delivered to the core sites by icebergs during glacial periods, with a significant contribution from sea ice. During glacial maxima very fine-grained sediment was deposited with sedimentation rates greatly reduced away from the margins to a hiatus of several kyr duration as shown for the Last Glacial Maximum. This sedimentary environment was possibly related to a very solid ice cover and reduced melt-out over a large part of the western Arctic Ocean.

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Published date: July 2009
Keywords: arctic ocean, sediment stratigraphy, sedimentary environments, late quaternary, glaciations
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 351206
URI: http://eprints.soton.ac.uk/id/eprint/351206
ISSN: 0921-8181
PURE UUID: c04536dc-5b5e-4564-bf24-e68af1756242
ORCID for Chuang Xuan: ORCID iD orcid.org/0000-0003-4043-3073

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Date deposited: 16 Apr 2013 11:02
Last modified: 18 Jul 2017 04:28

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Contributors

Author: Leonid Polyak
Author: Jens Bischof
Author: Joseph D. Ortiz
Author: Dennis A. Darby
Author: James E.T. Channell
Author: Chuang Xuan ORCID iD
Author: Darrell S. Kaufman
Author: Reidar Løvlie
Author: David A. Schneider
Author: Dennis D. Eberl
Author: Ruth E. Adler
Author: Edward A. Council

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