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

机译：过去1500万年北冰洋环流和风化投入的放射性同位素记录

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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) 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 similar to 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.
机译：对《综合海洋钻探计划》（`` IODP）来自罗蒙诺索夫海岭（北冰洋）的支腿302和PS2185核心。我们的记录被解释为反映了大陆侵蚀和海洋环流的变化，这主要是由该记录的较旧（2 Ma之前）部分的百万年时间尺度的构造强迫和欧亚大陆边缘的风化和侵蚀的气候强迫驱动的在年轻（2 Ma后）部分的千年时间尺度上。这些数据涵盖了类似于15 Ma的过去，表明向北冰洋中部的大陆输入与发生在欧亚大陆边缘的冰川和水文过程之间的联系更加紧密，而不是在北美大陆和格陵兰。碎屑输入特征的恒定性支持北极海冰覆盖的早期存在，而北半球2.7 Ma的主要冰川活动似乎对欧亚大陆边缘的风化状况影响不大。

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