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

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 f...

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Bibliographic Details
Main Authors: Haley, Brian A, Frank, Martin, Spielhagen, Robert F, Fietzke, Jan
Format: Dataset
Language:English
Published: PANGAEA 2008
Subjects:
302-CompSite
Amundsen Basin
Arctic Coring Expedition
ACEX
ARK-VIII/3
ARK-XVII/2
COMPCORE
Composite Core
Exp302
Gakkel Ridge
Arctic Ocean
Giant box corer
GKG
Integrated Ocean Drilling Program / International Ocean Discovery Program
IODP
KAL
Kasten corer
Lomonosov Ridge
Polarstern
PS19/148
PS19/157
PS19/166
PS19/178
PS19/186
PS19/189
PS19/194
PS19 ARCTIC91
PS2156-1
PS2163-2
PS2171-1
PS2179-1
PS2185-3
PS2185-6
PS2186-5
PS2190-3
PS59/280-1
PS59 AMORE
Svalbard
Vidar Viking
Arctic
Greenland
amundsen basin
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.734430
https://doi.org/10.1594/PANGAEA.734430
Description
Summary: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.

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