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首页> 美国卫生研究院文献>Elsevier Sponsored Documents >Nannofossil biostratigraphy strontium and carbon isotope stratigraphy cyclostratigraphy and an astronomically calibrated duration of the Late Campanian Radotruncana calcarata Zone
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Nannofossil biostratigraphy strontium and carbon isotope stratigraphy cyclostratigraphy and an astronomically calibrated duration of the Late Campanian Radotruncana calcarata Zone

机译：Nannofossil生物地层学锶和碳同位素地层学旋回地层学以及Campanian Radotruncana calcarata地区晚期的天文学校准持续时间

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摘要

A section from the southern (Austro-Alpine Northern Calcareous Alps) margin of the Penninic Ocean in the NW Tethys realm of Late Campanian age is investigated stratigraphically. Plankton foraminifer and nannofossil biostratigraphy designate the presence of the Globotruncana ventricosa Zone and the Radotruncana (Globotruncanita) calcarata Zone, and standard nannofossil zones CC21–UC15cTP and CC22ab–UC15deTP. The combination of carbon isotope stratigraphy, strontium isotopes, and cyclostratigraphy allows a detailed chronostratigraphic correlation. Periodicity was obtained by power spectral analysis, sinusoidal regression, and Morlet wavelets. The duration of the calcarata Total Range Zone is calculated by orbital cyclicity expressed in thickness data of limestone–marl rhythmites and stable carbon isotope data. Precessional, obliquity, and short and long eccentricity cycles are identified and give an extent of c. 806 kyr for the zone. Mean sediment accumulation rates are as low as 1.99 cm/kyr and correspond well to sediment accumulation rates in similar settings. We further discuss chronostratigraphic implications of our data.
机译：地层学研究了北坎普西时代西北特提斯地区宾尼洋南部边缘（南阿尔卑斯山北部钙质阿尔卑斯山）的一部分。浮游有孔虫和nannofossil生物地层学表明存在Globotruncana ventricosa区和Radotruncana（Globotruncanita）calcarata区，以及标准nannofossil区CC21–UC15c TP 和CC22ab–UC15de TP 。碳同位素地层学，锶同位素和旋回地层学的结合允许详细的年代地层相关性。周期性通过功率谱分析，正弦回归和Morlet小波获得。钙car总射程带的持续时间是通过轨道周期性计算的，该周期表示为石灰石-泥灰质节律的厚度数据和稳定的碳同位素数据。进动，倾斜和短而长的偏心周期被确定，并给出c的范围。区域的806kyr。平均沉积物沉积率低至1.99厘米/基尔，与相似环境下的沉积物沉积率非常吻合。我们将进一步讨论数据的年代地层意义。

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