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. PANGAEA, https://doi.org/10.1594/PANGAEA.734430, Supplement to: Haley, BA et al. (2008): Radiogenic isotope record of Arctic Ocean circulation and weathering inputs of the past 15 million years. Paleoceanography, 23(1), PA1S13, https://doi.org/10.1029/2007PA001486
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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.
Median Latitude: 86.820207 * Median Longitude: 121.816594 * South-bound Latitude: 80.086700 * West-bound Longitude: 30.230000 * North-bound Latitude: 89.986667 * East-bound Longitude: 144.166200
Date/Time Start: 1991-08-05T00:00:00 * Date/Time End: 2001-09-06T19:52:00
302-CompSite * Latitude: 87.890000 * Longitude: 137.650000 * Elevation: -1251.0 m * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking * Device: Composite Core (COMPCORE) * Comment: Virtual core composed of spliced cores from Holes M0002A, M0003A, M0004A and M0004C. Virtual position and water depth is calculated as the mean of all Exp302 sites.
PS2156-1 (PS19/148) * Latitude: 80.086700 * Longitude: 30.230000 * Date/Time: 1991-08-05T00:00:00 * Elevation: -258.0 m * Penetration: 0.33 m * Recovery: 0.33 m * Location: Svalbard * Campaign: ARK-VIII/3 (PS19 ARCTIC91) * Basis: Polarstern * Device: Giant box corer (GKG) * Comment: Test-Station