The colourful optical appearance of centric diatom fossil frustules with diagenetic nanocrystalline calcite fill

IF 1.8 3区 地球科学 Q1 GEOLOGY
Facies Pub Date : 2023-11-30 DOI:10.1007/s10347-023-00675-6
Moritz Liesegang, Mohamed Ghobara, Sabine Matting, Richard Wirth
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引用次数: 0

Abstract

Biophotonic nanostructures rarely withstand fossilization processes occurring after burial over geologic time. Even more distinctive is a change introduced to the optical properties during diagenetic processes resulting in a different optical appearance. Here, we report and explain the optical appearance of centric diatom frustules obtained from ash-bearing carbonate-cemented concretions on the Greifswalder Oie island (Pomeranian Bay, Germany, southern Baltic Sea). The ultrastructural and mineralogical analysis of the fossil frustules were carried out using electron microscopy techniques and were correlated to the macroscopic and microscopic optical appearance of the frustules before and after acid etching. The unique optical properties of the fossil diatoms were associated with diagenetic nanocrystalline calcite filling the frustules’ areolae. This fill created the macroscopic pale-yellow colour of many frustules, a microscopic iridescence probably associated with diffraction grating behaviour, and microscopic colour rings. The results highlight the unique permineralization process of diatom frustules and might be an addition to the emerging studies on frustule optics and photonics.

Abstract Image

具有成岩作用的纳米晶方解石充填的中心硅藻化石块状体的彩色光学外观
生物光子纳米结构很少经受住地质时期埋藏后发生的石化过程。更独特的是在成岩过程中引入的光学性质的变化,导致不同的光学外观。在这里,我们报告并解释了在Greifswalder Oie岛(德国波美拉尼亚湾,波罗的海南部)的含灰碳酸盐胶结物中获得的中心硅藻晶体的光学外观。利用电子显微镜技术对化石结晶体进行了超微结构和矿物学分析,并与酸蚀前后结晶体的宏观和微观光学形貌进行了对比。硅藻化石独特的光学特性与成岩作用下的纳米晶方解石填充了硅藻的乳晕有关。这种填充产生了许多晶体的宏观淡黄色,一种可能与衍射光栅行为有关的微观虹彩,以及微观色环。该结果突出了硅藻晶体独特的过矿化过程,并可能为晶体光学和光子学的新兴研究提供新的补充。
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来源期刊
Facies
Facies 地学-地质学
CiteScore
3.70
自引率
5.60%
发文量
15
审稿时长
>12 weeks
期刊介绍: The journal is open to papers dealing with the interpretation of ancient and modern biotopes and carbonate depositional environments by means of facies analysis in its broadest sense. Once the central part of research in hydrocarbon exploration, facies analysis more and more integrates modern and ancient biogeological processes of a changing earth. Special emphasis is laid on paleobiology and -ecology, basin evolution, sedimentology including diagenesis and geochemistry, as well as studies emphasising the impact of life on earth history. The main part of the target group will be people in academia.
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