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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >The Eocene-Oligocene transition (EOT) boundary at Mossy Grove, Mississippi
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The Eocene-Oligocene transition (EOT) boundary at Mossy Grove, Mississippi

机译：Mississippi Mossy Grove的eocene-oligocene转换（Eot）边界

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Events surrounding the Eocene-Oligocene boundary are considered to be the most recent transition from greenhouse to icehouse conditions. The significance of global cooling,associated with the onset of Antarctic glaciation across the E/O transition, was first documented by Kennett et al. (1975) and is now recognized as one of the largest climate transitions in the Cenozoic (Zachos et al., 2008). Here, we present new calcareous nannofossil assemblage data from the Mossy Grove core, Mississippi, which contains the Eocene-Oligocene transition (EOT). The study shows that calcareous nannofossils in the Mossy Grove core are very well preserved and abundant. Assigning an exact position to the E/O boundary is difficult, due to the rare occurrence of the planktic foraminiferal marker Hantkenina. The consistent presence of Coccolithus formosus up to a major lithological change at the top of the Yazoo Clay indicates that all of this section is within nannofossil Zone NP21 or older. The tops of both Discoaster saipanensis and Discoaster barbadiensis at 164' indicates that the EOT occurs between 164' and 55'. Nannofossil abundance patterns are also consistent with the EOT in this interval, which has a sudden drop in the abundance of several species. Pilot TEX86 and planktic foraminiferal isotope data demonstrate the links that exist between surface ocean temperature changes and calcareous nannofossil assemblages.
机译：围绕鄂科寡烯界界定的事件被认为是从温室到冰屋条件的最近过渡。全球冷却的重要性与E / O转换的南极冰川发作相关，首先由Kennett等人编写。 （1975），现在被认为是新生代最大的气候转变之一（Zachos等，2008）。在这里，我们呈现来自Mississpipi的Mossyprove Core，密西西比的新的钙质Nannofossil组合数据，其中包含何寡烯转换（EOT）。该研究表明，苔藓树丛核心中的钙质Nannofossils非常保存和丰富。由于Planktic Foraminiferal标志物Hantkenina的罕见发生，难以分配给E / O边界的确切位置。 Coccolithus Formosus的一致存在达到yazoo粘土顶部的一个主要岩性变化，表明所有这些部分都在Nannofossil区NP21或更年长。 Discoaster Saipanensis和Discoaster Barbadiensis的顶部表示为164'表示EOT在164'和55'之间发生。 Nannofossil丰度模式也与本间隔的EOT相一致，这在几种物种的丰富突然下降。 Pilot Tex86和Planktic Foraminiferare同位素数据证明了表面海洋温度变化和钙质Nannofossil组合之间存在的链接。

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