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

• Main Authors: Haley, Brian A, Frank, Martin, Spielhagen, Robert F, Fietzke, Jan
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2008
• Subjects: Composite Core; Giant box corer; Kasten corer; Exp302; ARK-XVII/2; ARK-VIII/3; CCGS Captain Molly Kool Vidar Viking; Polarstern; Integrated Ocean Drilling Program / International Ocean Discovery Program IODP; Arctic; Arctic Ocean; Greenland; Lomonosov Ridge
• Online Access: https://dx.doi.org/10.1594/pangaea.734430; https://doi.pangaea.de/10.1594/PANGAEA.734430

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 ... : Supplement to: Haley, Brian A; Frank, Martin; Spielhagen, Robert F; Fietzke, Jan (2008): Radiogenic isotope record of Arctic Ocean circulation and weathering inputs of the past 15 million years. Paleoceanography, 23(1), PA1S13 ...