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首页> 外文期刊>Terra Nova >Post-Eocene intensification of deep-water circulation in the central South Pacific: Micropalaeontological clues from dredged sites along the eastern Manihiki Plateau margin
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Post-Eocene intensification of deep-water circulation in the central South Pacific: Micropalaeontological clues from dredged sites along the eastern Manihiki Plateau margin

机译:南太平洋中部深水循环后的后期循环系统:沿着曼希基东部的疏浚景点的微钙管学线索

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摘要

Reconstruction of early Cenozoic deep-water circulation is one of the keys to modelling Earth's greenhouse-to-icehouse surface evolution, but it has long been hampered by the paucity of information from the central South Pacific. To help overcome this knowledge gap, we present new micropalaeontological data from dredged carbonates (R/V Sonne Expedition SO193) at several eastern volcanic salients of the Manihiki Plateau. Interestingly, despite appreciable longitudinal separations among the dredged sites, ages indicated by the foraminiferal assemblages are consistently around the Middle Eocene (including mixed Turonian [Late Cretaceous]/Eocene at a single site), suggesting widespread post-Eocene cessation of the pelagic sedimentation. By integrating with independent seismic and chronostratigraphic data (Deep Sea Drilling Project Leg 33) for large-scale erosion of top-Eocene-Oligocene sedimentary units on the eastern Manihiki Plateau, our results can be viewed as novel physical evidence for the intensification of central South Pacific deep-water circulation since the Eocene/Oligocene climatic transition.
机译:早期新生代深水循环的重建是建模地球温室到冰屋表面演变的关键之一,但它长期以来被中央南太平洋信息的缺乏阻碍了。为了帮助克服这种知识差距,我们在曼希基高原的几个东部火山促销品中提出了来自Deled碳酸盐(R / V Sonne Expectition So193)的新微淘盲族数据。有趣的是,尽管在疏浚遗址中具有明显的纵向分离,但是火山岩组装的年龄始终如一地围绕中胚(包括混合的Turonian [晚期白垩纪] / eocene在单一的位置),表明海洋沉淀的广泛咳嗽。通过与独立地震和计时数据(深海钻井项目腿33)集成,在Manihiki高原上的大型零嘌呤 - 寡糖沉积单元的大规模侵蚀,我们的结果可以被视为中南部强化的新型物理证据太平洋深水循环以来自虫族/少茂气候过渡。

著录项

  • 来源
    《Terra Nova》 |2019年第1期|共11页
  • 作者单位

    Smithsonian Inst Natl Museum Nat Hist Dept Paleobiol Washington DC 20560 USA;

    Univ Tokyo Atmosphere &

    Ocean Res Inst Chiba Japan;

    GEOMAR Helmholtz Ctr Ocean Res Kiel Kiel Germany;

    GEOMAR Helmholtz Ctr Ocean Res Kiel Kiel Germany;

    Smithsonian Inst Natl Museum Nat Hist Dept Paleobiol Washington DC 20560 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学、地球科学;
  • 关键词

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