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首页> 外文期刊>Paleoceanography >Ocean overturning since the Late Cretaceous: Inferences from a new benthic foraminiferal isotope compilation
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Ocean overturning since the Late Cretaceous: Inferences from a new benthic foraminiferal isotope compilation

机译：白垩纪晚期以来的海洋倾覆：来自新的底栖有孔虫同位素汇编的推论

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Benthic foraminiferal oxygen isotopic (δ~(18)O) and carbon isotopic (δ~(13)C) trends, constructed from compilations of data series from multiple ocean sites, provide one of the primary means of reconstructing changes in the ocean interior. These records are also widely used as a general climate indicator for comparison with local and more specific marine and terrestrial climate proxy records. We present new benthic foraminiferal δ~(18)O and δ~(13)C compilations for individual ocean basins that provide a robust estimate of benthic foraminiferal stable isotopic variations to ～80 Ma and tentatively to ～110 Ma. First-order variations in interbasinal isotopic gradients delineate transitions from interior ocean heterogeneity during the Late Cretaceous (>～65 Ma) to early Paleogene (35－65 Ma) homogeneity and a return to heterogeneity in the late Paleogene—early Neogene (35-0 Ma). We propose that these transitions reflect alterations in a first-order characteristic of ocean circulation: the ability of winds to make water in the deep ocean circulate. We document the initiation of large interbasinal δ~(18)O gradients in the early Oligocene and link the variations in interbasinal δ~(18)O gradients from the middle Eocene to Oligocene with the increasing influence of wind-driven mixing due to the gradual tectonic opening of Southern Ocean passages and initiation and strengthening of the Antarctic Circumpolar Current. The role of wind-driven upwelling, possibly associated with a Tethyan Circumequatorial Current, in controlling Late Cretaceous interior ocean heterogeneity should be the subject of further research.
机译：底栖有孔虫的氧同位素（δ〜（18）O）和碳同位素（δ〜（13）C）趋势是根据多个海洋站点的数据系列汇编构建的，是重建海洋内部变化的主要手段之一。这些记录还被广泛用作一般气候指标，用于与本地和更具体的海洋和陆地气候替代记录进行比较。我们为各个海洋盆地提供了新的底栖有孔虫δ〜（18）O和δ〜（13）C汇编，这些底栖动物有底栖有孔虫的稳定同位素变化估计值约为〜80 Ma，初步估计为〜110 Ma。基底间同位素梯度的一阶变化描述了白垩纪晚期（>〜65 Ma）内部海洋异质向古近纪早期（35－65 Ma）的同质性转变，古近纪晚期－新近纪（35-0）向异质性的转变嘛）。我们认为这些转变反映了海洋环流的一阶特征的变化：风使深海中的水循环的能力。我们记录了在渐新世早期大的基底间δ〜（18）O梯度的萌生，并将渐新世中期到渐新世的基底间δ〜（18）O梯度的变化与渐进式风动力混合的影响联系起来南大洋通道的构造开放以及南极绕极洋流的启动和加强。风动力上升流（可能与特提斯环太平洋洋流相关）在控制晚白垩世内部海洋非均质性中的作用应进一步研究。

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