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Fossil eggshells of amniotes as a paleothermometry tool
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 3 ) Pub Date : 2021-03-26 , DOI: 10.1016/j.palaeo.2021.110376
Seung Choi , Yong Park , Jin Jung Kweon , Seongyeong Kim , Haemyeong Jung , Sung Keun Lee , Yuong-Nam Lee

Raman spectroscopic analyses of thermally altered organic materials can be used to assess the paleothermometry of the sedimentary deposits. Although this technique has been widely applied to diverse microfossils, macroscopic vertebrate fossils have been neglected. In this paper, we show that fossil eggshells can be used for this purpose by demonstrating the paleothermometric potential of diverse amniotic eggshells from the Wido Volcanics (Upper Cretaceous, South Korea) that contain thermally altered organic material. We estimate the maximum paleotemperature recorded in the eggshells using Raman spectroscopic data and the spectrum deconvolution technique, which was invented and developed by organic geochemists. The results show that the same type of eggshells record different paleotemperature gradients depending on their spatial distribution in the fossil locality, whereas different types of eggshells from similar locations show similar paleotemperature gradients (except for one specimen with a peculiar microstructure). These findings are further supported by Fourier transform infrared spectroscopic results, which focus on thermally altered organic materials, and electron backscatter diffraction data, which focus on calcite twinning. This study suggests that fossil eggshells are useful and reliable materials for paleothermometry because thermally altered organic materials and calcites of eggshells provide independent opportunities to assess paleothermometry. We propose that fossil eggshells may be useful for evaluating the thermal evolution of sedimentary basins.



中文翻译:

羊膜化石蛋壳作为古温度计的工具

热改变的有机材料的拉曼光谱分析可用于评估沉积物的古温度计。尽管此技术已广泛应用于各种微化石,但宏观脊椎动物化石却被忽略了。在本文中,我们证明了化石蛋壳可用于此目的,方法是证明来自Wido火山岩(上白垩统,韩国)的各种羊膜蛋壳的古热测量潜力,这些羊皮蛋壳含有热改变的有机物质。我们使用有机地球化学家发明和开发的拉曼光谱数据和光谱去卷积技术估算了蛋壳中记录的最高古温度。结果表明,相同类型的蛋壳根据其在化石位置中的空间分布而记录不同的古温度梯度,而来自相似位置的不同类型的蛋壳具有相似的古温度梯度(除了一个具有特殊显微结构的标本)。这些发现得到了傅立叶变换红外光谱结果的进一步支持,该结果聚焦于热改变的有机材料,以及电子背散射衍射数据,聚焦于方解石孪晶。这项研究表明,化石蛋壳是用于古温度计的有用和可靠的材料,因为热改变的有机材料和蛋壳的方解石为评估古温度计提供了独立的机会。

更新日期:2021-04-08
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