Latitudinal temperature trends in the northern hemisphere during the Early Cretaceous (Valanginian–Hauterivian)

Latitudinal temperature trends in the northern hemisphere during the Early Cretaceous (Valanginian–Hauterivian)
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早白垩世期间北半球的纬度温度趋势(ValanginianâHauterivian)

DOI:
10.1016/j.palaeo.2015.02.003
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发表时间:
2015
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Mutterlose
Mutterlose
中科院分区:
--
文献类型:
--
作者:
Meissner;Mutterlose

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我们提出了北方地区南部凡兰吉阶(下白垩统)的第一个详细稳定同位素记录(δ13C、δ18O)。这些观测结果基于对德国西北部地层年代确定的剖面中 286 个箭石岩台的地球化学分析。凡兰吉阶早期晚期碳同位素偏移 (CIE) 大约为 2‰,记录了碳循环的扰动。这种正 CIE,即众所周知的特提斯海“Weissert 事件”,也显示在基于三个不同古纬度(北纬 35°、39°、65°)的已发表和自己数据的复合碳同位素记录中。这些发现表明,CIE 所指示的瓦兰吉阶早期早期的环境变化是同步的,从而表明存在全球控制。综合氧同位素数据集显示,北部地区南部和北极地区的温度长期波动高达 7°C,并在瓦兰吉尼阶晚期出现冷却,而特提斯数据仅记录了大约 7°C。 1°C 冷却。基于不同领域之间可靠的生物和化学地层相关性,这项研究强调了瓦朗吉阶环境扰动的幅度,并支持区域和全球因素共同导致这种变化的观点。
We present the first detailed stable isotope record (δ13C, δ18O) for the Valanginian (Lower Cretaceous) of the southern Boreal Realm. The observations are based on the geochemical analysis of 286 belemnite rostra from stratigraphically well-dated sections in northwest Germany. A major positive carbon isotope excursion (CIE) of ~ 2‰ in the early late Valanginian documents a perturbation of the carbon cycle. This positive CIE, which is well known as the ‘Weissert Event’ in the Tethys, is also displayed in composite carbon isotope records based on published and own data from three different palaeolatitudes (35°, 39°, 65° North). These findings suggest that the environmental changes indicated by the CIE in the early late Valanginian are synchronous, thereby pointing to a global control. The combined oxygen isotope data sets show long-term fluctuations of up to 7 °C with a cooling in the late Valanginian for both the southern and the arctic part of the Boreal Realm, whilst Tethyan data document only a ca. 1 °C cooling. Based on a reliable bio- and chemostratigraphic correlation between the different realms this study highlights the amplitude of the environmental perturbations in the Valanginian and supports the idea that a combination of regional and global factors caused such shifts.
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影响因子: 5.3
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