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首页> 外文期刊>Geology >Valanginian isotope variation in glendonites and belemnites from Arctic Svalbard: Transient glacial temperatures during the Cretaceous greenhouse
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Valanginian isotope variation in glendonites and belemnites from Arctic Svalbard: Transient glacial temperatures during the Cretaceous greenhouse

机译：北极斯瓦尔巴群岛的轻铝石和贝伦石中的瓦朗吉尼同位素变化：白垩纪温室时期的瞬时冰川温度

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摘要

Oxygen and carbon isotope data from Cretaceous (Valanginian) glendonites and belemnites from Arctic Svalbard are presented. Oxygen isotope data from well-preserved glendonites, in conjunction with the ikaite to glendonite pseudomorph transition temperature, are used to provide an estimate of the oxygen isotope composition of ambient seawater. Calculation of such a factor is essential for robust paleotemperature estimates. Using this methodology, our paleotemperatures calculated from the oxygen isotope compositions of coexisting belemnites yield cool temperatures (4-7 degrees C) consistent with transient glacial polar conditions during the Cretaceous greenhouse. Cool polar temperatures during the Cretaceous help reconcile geologic data with the simulations of general circulation models. Nevertheless, beyond this postulated and transient cool event within the Valanginian, the remainder of the isotope data are interpretable in terms of warm polar conditions during the Cretaceous greenhouse.
机译：给出了白垩纪（瓦朗吉尼亚人）的皂石和北极斯瓦尔巴德群岛的贝留尼姆石的氧和碳同位素数据。来自保存完好的钙长石的氧同位素数据，再加上从钾长石到假石的假晶过渡温度，可用来估算周围海水的氧同位素组成。这样的因子的计算对于可靠的古温度估算至关重要。使用这种方法，由共存的贝米尼特的氧同位素组成计算出的古温度产生的凉爽温度（4-7摄氏度）与白垩纪温室内短暂的冰川极地条件一致。白垩纪期间凉爽的极地温度有助于通过常规循环模型的模拟来协调地质数据。然而，除了在瓦朗吉尼气中的这一假定和短暂的冷事件之外，其余的同位素数据可以用白垩纪温室中的暖极条件解释。

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