Distinctive microfossil supports early Paleoproterozoic rise in complex cellular organisation

IF 2.7 2区 地球科学 Q2 BIOLOGY
Geobiology Pub Date : 2023-10-06 DOI:10.1111/gbi.12576
Erica V. Barlow, Christopher H. House, Ming-Chang Liu, Maxwell T. Wetherington, Martin J. Van Kranendonk
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Abstract

The great oxidation event (GOE), ~2.4 billion years ago, caused fundamental changes to the chemistry of Earth's surface environments. However, the effect of these changes on the biosphere is unknown, due to a worldwide lack of well-preserved fossils from this time. Here, we investigate exceptionally preserved, large spherical aggregate (SA) microfossils permineralised in chert from the c. 2.4 Ga Turee Creek Group in Western Australia. Field and petrographic observations, Raman spectroscopic mapping, and in situ carbon isotopic analyses uncover insights into the morphology, habitat, reproduction and metabolism of this unusual form, whose distinctive, SA morphology has no known counterpart in the fossil record. Comparative analysis with microfossils from before the GOE reveals the large SA microfossils represent a step-up in cellular organisation. Morphological comparison to extant micro-organisms indicates the SAs have more in common with coenobial algae than coccoidal bacteria, emphasising the complexity of this microfossil form. The remarkable preservation here provides a unique window into the biosphere, revealing an increase in the complexity of life coinciding with the GOE.

Abstract Image

独特的微体化石支持古元古代早期复杂细胞组织的兴起。
大约24亿年前的大氧化事件(GOE)导致了地球表面环境化学的根本变化。然而,由于当时世界范围内缺乏保存完好的化石,这些变化对生物圈的影响尚不清楚。在这里,我们研究了保存异常完好的大型球形聚集体(SA)微体化石,这些微体化石在约2.4年的燧石中得以矿化 西澳大利亚的Ga Turee Creek集团。野外和岩相观测、拉曼光谱测绘和原位碳同位素分析揭示了这种不寻常形态的形态、栖息地、繁殖和代谢,其独特的SA形态在化石记录中没有已知的对应物。与GOE之前的微体化石的比较分析表明,大型SA微体化石代表了细胞组织的升级。与现存微生物的形态学比较表明,SA与腔隙藻类的共同点多于球藻,这突出了这种微体化石形式的复杂性。这里的显著保存为了解生物圈提供了一个独特的窗口,揭示了与GOE相吻合的生命复杂性的增加。
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来源期刊
Geobiology
Geobiology 生物-地球科学综合
CiteScore
6.80
自引率
5.40%
发文量
56
审稿时长
3 months
期刊介绍: The field of geobiology explores the relationship between life and the Earth''s physical and chemical environment. Geobiology, launched in 2003, aims to provide a natural home for geobiological research, allowing the cross-fertilization of critical ideas, and promoting cooperation and advancement in this emerging field. We also aim to provide you with a forum for the rapid publication of your results in an international journal of high standing. We are particularly interested in papers crossing disciplines and containing both geological and biological elements, emphasizing the co-evolutionary interactions between life and its physical environment over geological time. Geobiology invites submission of high-quality articles in the following areas: Origins and evolution of life Co-evolution of the atmosphere, hydrosphere and biosphere The sedimentary rock record and geobiology of critical intervals Paleobiology and evolutionary ecology Biogeochemistry and global elemental cycles Microbe-mineral interactions Biomarkers Molecular ecology and phylogenetics.
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