Radiogenic isotope record of Arctic Ocean circulation and weathering inputs of the past 15 million years.

Haley, Brian, Frank, Martin , Spielhagen, Robert and Fietzke, Jan (2008) Radiogenic isotope record of Arctic Ocean circulation and weathering inputs of the past 15 million years. Open Access Paleoceanography, 23 (A001486). DOI 10.1029/2007PA001486.

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Abstract

Lead (Pb), neodymium (Nd), and strontium (Sr) isotopic analyses were carried out on sediment leachates (reflecting the isotope composition of past seawater) and digests of the bulk residues (reflecting detrital continental inputs) of Integrated Ocean Drilling Program (IODP) Leg 302 and core PS2185 from the Lomonosov Ridge (Arctic Ocean). Our records are interpreted to reflect changes in continental erosion and oceanic circulation, driven predominantly by tectonic forcing on million-year timescales in the older (pre-2 Ma) part of the record and by climatic forcing of weathering and erosion of the Eurasian continental margin on thousand-year timescales in the younger (post-2 Ma) part. These data, covering the past ∼15 Ma, show that continental inputs to the central Arctic Ocean have been more closely linked to glacial and hydrological processes occurring on the Eurasian margin than on continental North America and Greenland. The constancy of the detrital input signatures supports the early existence of an Arctic sea ice cover, whereas the major initiation of Northern Hemisphere glaciation at 2.7 Ma appears to have had little impact on the weathering regime of the Eurasian continental margin.

Document Type: Article
Keywords: Radiogenic isotopes, Arctic Ocean circulation, Paleoceanography; IODP leg 302; Core PS2185; Lomonosov Ridge
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2007PA001486
ISSN: 0883-8305
Projects: IODP, ECORD
Date Deposited: 03 Dec 2008 16:50
Last Modified: 10 May 2017 08:17
URI: http://oceanrep.geomar.de/id/eprint/4501

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