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No Change in Southern Ocean Circulation in the Indian Ocean From the Eocene Through Late Oligocene

机译：从oocene通过晚期ocigocene的印度洋南海循环没有变化

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摘要

Deciphering the evolution of Southern Ocean circulation during the Eocene and Oligocene has important implications for understanding the development of the Antarctic Circumpolar Current and transition to Earth's "icehouse" climate. To better understand ocean circulation patterns in the Indian Ocean sector of the Southern Ocean, we generated a new fossil fish tooth neodymium isotope record (ε_(Nd)) from the upper Eocene to upper Oligocene sections (36-23 Ma) of Ocean Drilling Program Sites 744 and 748 (Kerguelen Plateau, Indian Ocean). Reconstructed seawater ε_(Nd) values from fossil fish teeth are used to trace changes in water masses across ocean basins. The records from Site 748 and Site 744 reveal a gradual shift from ε_(Nd) values around -6.5 to -7.5 in the late Eocene to ε_(Nd) values between -7.5 and -8.3 by the late Oligocene, consistent with a Circumpolar Deep Water (CDW) influence at the Kerguelen Plateau throughout the Oligocene. We interpret the shift to less radiogenic values to reflect the increased export of Northern Component Water to the Southern Ocean, likely into the proto-CDW. However, the records show no major change in water mass composition around the Kerguelen Plateau that would accompany an increase in Pacific throughflow related to the opening of Drake Passage and imply that Pacific throughflow via the Drake Passage occurred by the late Eocene. High-frequency variability in ?Nd values at Site 744 is interpreted as an imprint of Oligocene glacial activity, with a particularly pronounced excursion at 32.6 Ma roughly coinciding with other glacial weathering indicators around Antarctica.
机译：在虫期和少世中的南海循环的演变具有重要意义，对理解南极环球电流的发展和向地球“冰屋”气候的发展。为了更好地了解南海印度洋地区的海洋循环模式，我们将新的化石鱼牙钕同位素记录（ε_（nd））从上群到洋肠钻井计划的上部寡烯部分（36-23 mA）产生网站744和748（Kerguelen高原，印度洋）。来自化石鱼牙的重建海水ε_（ND）值用于追踪海洋盆地水群的变化。来自站点748和站点744的记录揭示了从晚期寡核苷酸的后期eocene左右的ε_（nd）值逐渐转变为-7.5和-8.3之间的ε_（nd）值，与散铝深度一致水（CDW）在整个少茂的Kerguelen高原的影响。我们将转变解释为较少的辐射性值，以反映北方北方的北方北部的产出增加，可能进入ProTo-CDW。然而，记录显示出kerguelen高原周围的水质组成的主要变化，这将伴随与德雷克通道的开放相关的太平洋流行增加，并暗示通过德雷克通道发生太平洋流量由晚期发生。位点744的高频变异性（位点744的Nd值被解释为寡核苷冰酸的印记，在32.6 mA时，特别明显的偏移大致与南极洲周围的其他冰川风化指标重合。

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  • 来源
    《Paleoceanography》 |2018年第2期|共16页
  • 作者

    Nicky M. Wright; Howie D. Scher; Maria Seton; Claire E. Huck; Brian D. Duggan;

  • 作者单位

    EarthByte Group School of Geosciences University of Sydney Sydney New South Wales Australia;

    Department of Earth and Ocean Sciences University of South Carolina Columbia SC USA;

    EarthByte Group School of Geosciences University of Sydney Sydney New South Wales Australia;

    Department of Ocean and Earth Science National Oceanography Centre University of Southampton Southampton UK;

    Department of Earth and Ocean Sciences University of South Carolina Columbia SC USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

    No Change; Southern Ocean; Circulation;

    机译：没有变化;南洋;流通;

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