Paleogene record of elemental concentrations in sediments from the Arctic Ocean obtained by XRF analyses
Paleogene record of elemental concentrations in sediments from the Arctic Ocean obtained by XRF analyses
We present a high-resolution X-ray fluorescence (XRF) core scanner record for the expanded middle Eocene section from Integrated Ocean Drilling Program (IODP) Expedition 302 (ACEX) drilled on the Lomonosov Ridge, central Arctic Ocean. The division of the middle Eocene into two units (subunit 1/6 and unit 2) is seen in the cyclical behavior of the elements as well as the changing interelemental correlations and their relationship to physical property measurements of bulk sediment. Al, Ti, and K strongly correlate throughout the record, while the behavior of Fe, Mn, and Si is more complex. Utilizing sediment geochemistry calibration to ground truth the XRF data, we suggest the middle Eocene Arctic Ocean was predominately euxinic, although periodic oxygenation of bottom waters must have occurred during unit 2 (49.7–45.4 Ma). Initially, the sediments are rich in biogenic silica (unit 2), but there is a pronounced shift to terrigenous dominated sediment accumulation in subunit 1/6. We report changes in the elemental concentrations of these elements and investigate the relationship between Fe content and pyrite. Additionally, we explore the potential change in paleoenvironmental conditions across the unit boundary.
Eocene, arctic, X-ray fluorescence.
PA1S09
Spofforth, D.J.A.
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Pälike, H.
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Green, D.R.H.
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2008
Spofforth, D.J.A.
b989dfad-64d8-482a-8e49-8a0bbc1c7ad7
Pälike, H.
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Green, D.R.H.
0d7d86c4-d674-4514-8aa6-259134dc7b57
Spofforth, D.J.A., Pälike, H. and Green, D.R.H.
(2008)
Paleogene record of elemental concentrations in sediments from the Arctic Ocean obtained by XRF analyses.
Paleoceanography, 23, .
(doi:10.1029/2007PA001489).
Abstract
We present a high-resolution X-ray fluorescence (XRF) core scanner record for the expanded middle Eocene section from Integrated Ocean Drilling Program (IODP) Expedition 302 (ACEX) drilled on the Lomonosov Ridge, central Arctic Ocean. The division of the middle Eocene into two units (subunit 1/6 and unit 2) is seen in the cyclical behavior of the elements as well as the changing interelemental correlations and their relationship to physical property measurements of bulk sediment. Al, Ti, and K strongly correlate throughout the record, while the behavior of Fe, Mn, and Si is more complex. Utilizing sediment geochemistry calibration to ground truth the XRF data, we suggest the middle Eocene Arctic Ocean was predominately euxinic, although periodic oxygenation of bottom waters must have occurred during unit 2 (49.7–45.4 Ma). Initially, the sediments are rich in biogenic silica (unit 2), but there is a pronounced shift to terrigenous dominated sediment accumulation in subunit 1/6. We report changes in the elemental concentrations of these elements and investigate the relationship between Fe content and pyrite. Additionally, we explore the potential change in paleoenvironmental conditions across the unit boundary.
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Published date: 2008
Keywords:
Eocene, arctic, X-ray fluorescence.
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Local EPrints ID: 50764
URI: http://eprints.soton.ac.uk/id/eprint/50764
ISSN: 0883-8305
PURE UUID: ac250c97-4b14-424a-ad16-60b09fcab9dd
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Date deposited: 26 Mar 2008
Last modified: 15 Mar 2024 10:11
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Author:
D.J.A. Spofforth
Author:
H. Pälike
Author:
D.R.H. Green
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