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Deep and bottom water export from the Southern Ocean to the Pacific over the past 38 million years

机译：过去3800万年来，从南大洋向太平洋的深水和底水出口

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摘要

The application of radiogenic isotopes to the study of Cenozoic circulation patterns in the South Pacific Ocean has been hampered by the fact that records from only equatorial Pacific deep water have been available. We present new Pb and Nd isotope time series for two ferromanganese crusts that grew from equatorial Pacific bottom water (D137-01, “Nova,” 7219 m water depth) and southwest Pacific deep water (63KD, “Tasman,” 1700 m water depth). The crusts were dated using 10Be/9Be ratios combined with constant Co-flux dating and yield time series for the past 38 and 23 Myr, respectively. The surface Nd and Pb isotope distributions are consistent with the present-day circulation pattern, and therefore the new records are considered suitable to reconstruct Eocene through Miocene paleoceanography for the South Pacific. The isotope time series of crusts Nova and Tasman suggest that equatorial Pacific deep water and waters from the Southern Ocean supplied the dissolved trace metals to both sites over the past 38 Myr. Changes in the isotopic composition of crust Nova are interpreted to reflect development of the Antarctic Circumpolar Current and changes in Pacific deep water circulation caused by the build up of the East Antarctic Ice Sheet. The Nd isotopic composition of the shallower water site in the southwest Pacific appears to have been more sensitive to circulation changes resulting from closure of the Indonesian seaway.
机译：由于仅可获得赤道太平洋深水的记录，因此妨碍了将放射性同位素应用于南太平洋新生代循环模式的研究。我们介绍了两个赤铁太平洋地壳（赤道太平洋底部水（D137-01，“ Nova”，水深为7219 m）和西南太平洋深水（63KD，“塔斯曼”，水深为1700 m）的新的Pb和Nd同位素时间序列。 ）。使用10Be / 9Be比值结合过去38 Myr和23 Myr的恒定Co-flux定年和屈服时间序列确定地壳的年代。地表Nd和Pb同位素分布与当今的循环模式一致，因此新记录被认为适合通过中新世古海洋学重建南太平洋的始新世。地壳Nova和Tasman的同位素时间序列表明，在过去的38 Myr中，赤道太平洋深水和来自南大洋的水将溶解的痕量金属提供给两个地点。地壳新星同位素组成的变化被解释为反映南极洲极地洋流的发展以及东极南极冰盖的形成引起的太平洋深水环流的变化。西南太平洋较浅水位的Nd同位素组成似乎对印度尼西亚航道关闭导致的环流变化更为敏感。

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