Valanginian isotope variation in glendonites and belemnites from Arctic Svalbard: Transient glacial temperatures during the Cretaceous greenhouse

Gregory D. Price; Elizabeth V. Nunn

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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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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 °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（Valanginian）格伦石和北极斯瓦尔巴特群岛的贝伦尼特石的氧和碳同位素数据。 >具有从kaite到glendonite假晶的转变温度，用于估算周围海水的氧同位素组成。对于可靠的古温度估计，计算这样一个因子是必不可少的。使用这种方法，根据共存的甜菜碱的氧同位素组成计算出的我们的古温度产生的凉爽温度（4–7 °C）与瞬时冰川一致白垩纪温室中的极地条件。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协调地质数据。然而，除了瓦朗吉尼亚中假定的和短暂的冷事件外，同位素数据的其余可以用暖极性条件解释。白垩纪温室。

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《Geology》 |2010年第3期|251-254|共4页
作者
Gregory D. Price; Elizabeth V. Nunn;
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School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK;

Department of Applied and Analytical Paleontology, Institute for Geosciences, Johannes Gutenberg-Universit?t Mainz, Johann-Joachim-Becher-Weg 21, 55128 Mainz, Germany;

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1. Valanginian isotope variation in glendonites and belemnites from Arctic Svalbard: Transient glacial temperatures during the Cretaceous greenhouse [J] . Price GD, Nunn EV Geology . 2010,第3期

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
2. Isotopic signals from late Jurassic-early Cretaceous (Volgian-Valanginian) sub-Arctic belemnites, Yatria River, Western Siberia [J] . G.D. Price, J. Mutterlose Journal of the Geological Society . 2004,第6期

机译：来自西西伯利亚亚特里亚河的侏罗纪晚期-早白垩世（Volgian-Valanginian）亚北极贝类的同位素信号
3. Isotopic signals from late Jurassic-early Cretaceous (Volgian-Valanginian) sub-Arctic belemnites, Yatria River, Western Siberia [J] . Price GD, Mutterlose J Journal of the Geological Society . 2004,第6期

机译：来自西西伯利亚亚特里亚河的侏罗纪晚期-早白垩世（Volgian-Valanginian）亚北极贝类的同位素信号
4. Paleoclimate Variations Inferred from Organic Carbon Isotopic Composition in Hetao Plain in North China since Late Glacial Period [C] . Yang Guifang, Wu Fadong, Ge Zhiliang, The International Conference of Geobiology(地球生物学国际研讨会） . 2010

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6. Silicon isotopes in Arctic and sub-Arctic glacial meltwaters: the role of subglacial weathering in the silicon cycle [O] . Jade E. Hatton, Katharine R. Hendry, Jonathan R. Hawkings, -1

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7. An improved model for the ikaite-glendonite transformation: evidence from the Lower Cretaceous of Spitsbergen, Svalbard [O] . Madeleine Vickers, Matthew Watkinson, Gregory D. Price, 2018

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Valanginian isotope variation in glendonites and belemnites from Arctic Svalbard: Transient glacial temperatures during the Cretaceous greenhouse

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