Campanian – Maastrichtian carbon isotope stratigraphy: shelf-ocean correlation between the European shelf sea and the tropical Pacific Ocean
Campanian – Maastrichtian carbon isotope stratigraphy: shelf-ocean correlation between the European shelf sea and the tropical Pacific Ocean
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DOI：
10.1127/0078-0421/2010/0004
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发表时间：
2010-10
影响因子：
2.2
通讯作者：
S. Voigt;O. Friedrich;R. Norris;J. Schönfeld
中科院分区：
文献类型：
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作者：
S. Voigt;O. Friedrich;R. Norris;J. Schönfeld
迄今为止，人们对坎帕尼亚-马斯特里赫斯时代的长期气候冷却还没有很好的了解，特别是因为生物地层学的低时间分辨率带来的不确定性，以及热带和温带类群之间明显的地域性。两个新的高分辨率碳同位素记录来自德国北部拉格多夫-克朗斯穆尔-海姆尔北部陆架-海剖面和热带太平洋沙茨基隆起深海钻探项目现场305号，减少了这些不确定性。这些记录可以与迄今为止生物地层学方法无法达到的精度相关联。在坎帕尼亚晚期和马斯特里赫斯早期都可以识别出不同的碳同位素事件，这表明它们代表了全球碳循环的扰动。特别是，早期马斯特里赫期的负碳同位素漂移是太平洋和南大洋开阔海洋记录的一个显著特征，在与北大西洋有关的陆架海区首次被发现。此外，两个短期的正向漂移被认为是这次事件的叠加信号。改进的地层学提供了独特的机会，以识别不同海洋环境和生态系统的碳循环和海洋循环之间的领先和滞后，从而更好地了解其原因和影响。
The long-term climate cooling during Campanian - Maastrichtian times is not well understood to date, especially because of the uncertainty introduced by low temporal resolution of biostratigraphy and the pronounced provincialism between tropical and temperate taxa. Two new high-resolution carbon isotope records derived from the boreal shelf-sea section at Lagerdorf-Kronsmoor-Hemmoor, northern Germany and the tropical Pacific at Deep Sea Drilling Project Site 305, Shatsky Rise, reduce these uncertainties. The records can be correlated with an accuracy not achieved by biostratigraphic methods so far. Distinct carbon isotope events in the late Campanian and the early Maastrichtian can be identified at both localities suggesting to represent global carbon cycle perturbations. Especially, the negative carbon isotope excursion in the early Maastrichtian, a pronounced feature of open-ocean records from the Pacific and Southern oceans, is recognized for the first time at a shelf-sea locality related to the North Atlantic Ocean. Furthermore, two short-term positive excursions are identified as superimposed signals to this event. The improved stratigraphy provides the unique opportunity to recognize leads and lags between the carbon cycle and ocean circulation of different marine settings and ecosystems, leading to a better understanding of their causes and effects.