Orbital scale variations and timescales from the Arctic Ocean
Orbital scale variations and timescales from the Arctic Ocean
We investigate geochemical measurements from the Arctic Coring Expedition to derive sedimentation rates for selected intervals in the early and middle Eocene. This analysis is performed by quantifying cyclical variations in physical property data and elemental concentrations derived with an X-ray fluorescence (XRF) core scanner. Our results show that physical properties and XRF-derived elemental concentrations are coherent and correlated to each other. Changes in elemental concentrations occur on depth scales from decimeters to meters and correspond to varying contributions of detrital minerals and biogenic silica. We confirm and refine sedimentation rates of the order of 10 to 25 m Ma?1. These rates were obtained independently through biostratigraphic and magnetostratigraphic methods. We observe a strong imprint of astronomically sourced cycles, particularly through climatic precession. This observation allows us to test recently proposed theoretical calculations of insolation.
Arctic, Eocene, Milankovitch
PA1S10
Pälike, H.
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Spofforth, D.J.A.
b989dfad-64d8-482a-8e49-8a0bbc1c7ad7
O'Regan, M.
83b80486-4e18-4089-9b12-361232727095
Gattacceca, J.
b6b9450e-73c5-4c19-9e0a-595809e16530
2008
Pälike, H.
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Spofforth, D.J.A.
b989dfad-64d8-482a-8e49-8a0bbc1c7ad7
O'Regan, M.
83b80486-4e18-4089-9b12-361232727095
Gattacceca, J.
b6b9450e-73c5-4c19-9e0a-595809e16530
Pälike, H., Spofforth, D.J.A., O'Regan, M. and Gattacceca, J.
(2008)
Orbital scale variations and timescales from the Arctic Ocean.
Paleoceanography, 23, .
(doi:10.1029/2007PA001490).
Abstract
We investigate geochemical measurements from the Arctic Coring Expedition to derive sedimentation rates for selected intervals in the early and middle Eocene. This analysis is performed by quantifying cyclical variations in physical property data and elemental concentrations derived with an X-ray fluorescence (XRF) core scanner. Our results show that physical properties and XRF-derived elemental concentrations are coherent and correlated to each other. Changes in elemental concentrations occur on depth scales from decimeters to meters and correspond to varying contributions of detrital minerals and biogenic silica. We confirm and refine sedimentation rates of the order of 10 to 25 m Ma?1. These rates were obtained independently through biostratigraphic and magnetostratigraphic methods. We observe a strong imprint of astronomically sourced cycles, particularly through climatic precession. This observation allows us to test recently proposed theoretical calculations of insolation.
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Published date: 2008
Keywords:
Arctic, Eocene, Milankovitch
Identifiers
Local EPrints ID: 50751
URI: http://eprints.soton.ac.uk/id/eprint/50751
ISSN: 0883-8305
PURE UUID: 4b18ab6b-b8be-43d9-9ca6-5cf2f5b2df48
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Date deposited: 19 Mar 2008
Last modified: 15 Mar 2024 10:11
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Contributors
Author:
H. Pälike
Author:
D.J.A. Spofforth
Author:
M. O'Regan
Author:
J. Gattacceca
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