Beryllium isotopes in central Arctic Ocean sediments over the past 12.3 million years: Stratigraphic and paleoclimatic implications.

Frank, Martin , Backman, Jan, Jakobsson, Martin, Moran, Kate, O'Regan, Matthew, King, John, Haley, Brian, Kubik, Peter W. and Garbe-Schönberg, C.-Dieter (2008) Beryllium isotopes in central Arctic Ocean sediments over the past 12.3 million years: Stratigraphic and paleoclimatic implications. Open Access Paleoceanography, 23 (PA1S03). DOI 10.1029/2007PA001478.

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Abstract

The upper 200 m of the sediments recovered during IODP Leg 302, the Arctic Coring Expedition (ACEX), to the Lomonosov Ridge in the central Arctic Ocean consist almost exclusively of detrital material. The scarcity of biostratigraphic markers severely complicates the establishment of a reliable chronostratigraphic framework for these sediments, which contain the first continuous record of the Neogene environmental and climatic evolution of the Arctic region. Here we present profiles of cosmogenic 10Be together with the seawater-derived fraction of stable 9Be obtained from the ACEX cores. The down-core decrease of 10Be/9Be provides an average sedimentation rate of 14.5 ± 1 m/Ma for the uppermost 151 m of the ACEX record and allows the establishment of a chronostratigraphy for the past 12.3 Ma. The age-corrected 10Be concentrations and 10Be/9Be ratios suggest the existence of an essentially continuous sea ice cover over the past 12.3 Ma.

Document Type: Article
Keywords: Be isotopes, Neogene, Arctic sediments, dating
Research affiliation: Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2007PA001478
ISSN: 0883-8305
Projects: ACEX, Arctic Coring Expedition, Future Ocean, IODP
Date Deposited: 03 Dec 2008 16:50
Last Modified: 10 May 2017 08:12
URI: http://oceanrep.geomar.de/id/eprint/2225

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