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首页> 外文期刊>Cretaceous Research >Upper Campanian-Maastrichtian nannofossil biostratigraphy and high-resolution carbon-isotope stratigraphy of the Danish Basin: Towards a standard δ ~(13)C curve for the Boreal Realm
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Upper Campanian-Maastrichtian nannofossil biostratigraphy and high-resolution carbon-isotope stratigraphy of the Danish Basin: Towards a standard δ ~(13)C curve for the Boreal Realm

机译：丹麦盆地的上坎潘期-马斯特里赫特纳米化石生物地层学和高分辨率碳同位素地层：走向北方区的标准δ〜（13）C曲线

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摘要

High-resolution carbon isotope stratigraphy of the upper Campanian-Maastrichtian is recorded in the Boreal Realm from a total of 1968 bulk chalk samples of the Stevns-1 core, eastern Denmark. Isotopic trends are calibrated by calcareous nannofossil bio-events and are correlated with a lower-resolution δ ~(13)C profile from R?rdal, northwestern Denmark. A quantitative approach is used to test the reliability of Upper Cretaceous nannofossil bio-events and provides accurate biohorizons for the correlation of δ ~(13)C profiles. The Campanian-Maastrichtian boundary (CMB) is identified through the correlation of dinoflagellate biostratigraphy and δ ~(13)C stratigraphy between Stevns-1 and the Global boundary Standard Stratotype-section and Point at Tercis les Bains (SW France), allowing the identification of new chemical and biostratigraphic markers that provide a precise placement of the stage boundary on a regional scale. The boundary interval corresponds to the third phase of a stepwise 0.8‰ negative δ ~(13)C excursion, lies in calcareous nannofossil subzone UC16d ~(BP), and encompasses the last occurrence of nannofossil Tranolithus stemmerikii and first occurrence of nannofossil Prediscosphaera mgayae. Fifteen δ ~(13)C events are defined and correlated to sixteen reliable nannofossil biohorizons, thus providing a well-calibrated standard high-resolution δ ~(13)C curve for the Boreal Realm.
机译：从丹麦东部Stevns-1岩心的总共1968个散装白垩样本中，在北境中记录了上坎帕尼-马斯特里赫特的高分辨率碳同位素地层。同位素趋势由钙质纳米化石生物事件校准，并与来自丹麦西北部Rrdrd的较低分辨率的δ〜（13）C曲线相关。一种定量方法被用来测试上白垩统纳米化石生物事件的可靠性，并为δ〜（13）C剖面的相关性提供准确的生物地平线。通过在Stevns-1和全球边界标准地层剖面以及Tercis les Bains点（法国西南）之间的鞭毛生物地层学和δ〜（13）C地层的相关性，确定了Campanian-Maastrichtian边界（CMB）。新的化学和生物地层标记，可以在区域规模上精确定位阶段边界。边界区间对应于逐步的0.8‰负δ〜（13）C偏移的第三阶段，位于钙质纳米化石分区UC16d〜（BP）中，涵盖了最后一次出现的纳米化石Tranolithus stemmerikii和第一次出现的纳米化石Prediscoscosera mgayae。定义了15个δ〜（13）C事件并将其与16个可靠的纳米化石生物地平线相关联，从而为北方领域提供了经过良好校准的标准高分辨率δ〜（13）C曲线。

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