Radiogenic isotope record of Arctic Ocean circulation and weathering inputs of the past 15 million years
作者： B. A. Haley , M. Frank , R. F. Spielhagen , J. Fietzke
DOI: 10.1029/2007PA001486
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摘要: Lead (Pb), neodymium (Nd), and strontium (Sr) isotopic analyses were carried out on sediment leachates (reflecting the isotope composition of past seawater) digests bulk residues detrital continental inputs) Integrated Ocean Drilling Program (IODP) Leg 302 core PS2185 from Lomonosov Ridge (Arctic Ocean). Our records are interpreted to reflect changes in erosion oceanic circulation, driven predominantly by tectonic forcing million-year timescales older (pre-2 Ma) part record climatic weathering Eurasian margin thousand-year younger (post-2 part. These data, covering ∼15 Ma, show that inputs central Arctic have been more closely linked glacial hydrological processes occurring than North America Greenland. The constancy input signatures supports early existence an sea ice cover, whereas major initiation Northern Hemisphere glaciation at 2.7 Ma appears had little impact regime margin.
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