Orbital scale variations and timescales from the Arctic Ocean

Pälike, H., Spofforth, D. J. A, O'Regan, Matthew and Gattacceca, J. 2008. Orbital scale variations and timescales from the Arctic Ocean. Paleoceanography 23 (1) , PA1S10. 10.1029/2007PA001490

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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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	Q Science > QE Geology
Uncontrolled Keywords:	Arctic; Eocene; Milankovitch
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/1944-9186/ (accessed 20/02/2014).
Publisher:	American Geophysical Union
ISSN:	0883-8305
Date of First Compliant Deposit:	30 March 2016
Last Modified:	23 May 2023 16:29
URI:	https://orca.cardiff.ac.uk/id/eprint/7533

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