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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Why an updated zonation of Neogene calcareous nannofossils?
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Why an updated zonation of Neogene calcareous nannofossils?

机译：为什么要对新近生的钙质纳米化石进行更新分区？

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Two new calcareous nannofossil biozonations were published in 2012 and 2014, one for the Neogene and one for the Paleogene (Backman et al., 2012; Agnini et al., 2014). These zonations incorporated updated biostratigraphic data and methodologies within the known biostratigraphic framework of Martini and Bukry (Martini, 1971; Bukry,1973,1978; Okada & Bukry,1980). Because Martini's and Okada and Bukry's zonations have been used for almost 40 years, there was a need for an update. The revised biozonations represent low and middle latitude biostratigraphic data that we have generated over the past three decades. The aim was to pursue a detailed calcareous nannofossil biostratigraphy through the use of semi-quantitative methods in combination with short sample intervals. A "detailed" biostratigraphy, in our practice, does not mean the overuse of biohorizons for the highest biostratigraphic resolution attainable, at the expense of their reproducibility. It is rather aimed at finding a balance between accuracy and applicability, with the use of a limited set of selected biohorizons that result in a relatively coarsely resolved biozonation. This represents a guarantee of ease of communication and viability in practical geologic work. Each biozone boundary is defined with a single biohorizon. Subzones and auxiliary markers are avoided, in order to maintain stability within the new biozonation. For the Neogene biozonation, we used a new code system that was subsequently applied to the Paleogene. Code letters for each series and a number for each of the 31 biozones were used: calcareous nannofossil Miocene (CNM) biozones 1 to 20 and calcareous nannofossil Plio-Pleistocene (CNPL) biozones 1 to 11. Additional biohorizons were considered, mainly when they unequivocally characterized the assemblage composition within a biozone. We assigned updated age estimates to all biozone boundary markers and to several additional biohorizons that were derived from astronomically tuned cyclostratigraphies.
机译：2012年和2014年发布了两个新的钙质纳米化石生物区带，一个是新近生，另一个是古近生（Backman等，2012; Agnini等，2014）。这些地带在马提尼和布克里（Martini，1971; Bukry，1973,1978; Okada＆Bukry，1980）的已知生物地层学框架内纳入了更新的生物地层数据和方法。由于Martini和Okada和Bukry的分区已使用了近40年，因此需要进行更新。修订后的生物区带代表了我们在过去三十年中获得的中低纬度生物地层学数据。目的是通过半定量方法结合较短的采样间隔来进行详细的钙质纳米化石生物地层学研究。在我们的实践中，“详细的”生物地层学并不意味着为了获得最高的生物地层分辨率而过度使用生物地平线，而以其可再现性为代价。它的目的是通过使用有限的一组选定的生物水平来找到准确性和适用性之间的平衡，这会导致较粗略地解决生物分区。这代表了在实际地质工作中易于沟通和生存的保证。每个生物区边界都由单个生物地平线定义。避免分区和辅助标记，以在新的生物分区内保持稳定性。对于新基因生物区划，我们使用了新的代码系统，该代码系统随后应用于古基因。使用了每个系列的代号和31个生物区中每个区的编号：钙质纳米化石中新世（CNM）生物区1至20和钙质纳米化石上新世（CNPL）生物区1至11。主要考虑了其他生物地平线，主要是明确地使用它们表征了生物区内的组合物组成。我们将更新的年龄估算值分配给所有生物区带边界标记以及从天文学调整的旋回地层学中获得的其他几个生物地平线。

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