A Flourishing Planktonic Microbial Community in an Interglacial Offshore Environment: Silicified Microfossils From the Cryogenian Datangpo Formation, South China

IF 3.4 2区地球科学 Q2 BIOLOGY

Geobiology Pub Date : 2025-09-26 DOI:10.1111/gbi.70034

Qing Ouyang, Chuanming Zhou, Xianguo Lang, Yuangao Qu, Hongyi Shi, Yunpeng Sun, Zhe Chen

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Abstract

The Cryogenian global glaciations profoundly shaped the evolution of Earth's ecosystem. An active Cryogenian biosphere accompanied by key evolutionary innovations has been indicated by geochemical and phylogenetic studies, although fossil records from Cryogenian strata are limited. In this study, we report a silicified microfossil assemblage from the Cryogenian Datangpo Formation in an interglacial offshore setting of the Yangtze block, South China. The Datangpo assemblage majorly comprises coccoidal microfossils classified into three morphological types, with minor components of fragmented filamentous forms. Morphological and structural observations combined with Raman spectroscopic analysis indicate that this microfossil assemblage may represent a planktonic microbial community dominated by cyanobacteria. The exceptionally silicified taphonomic window in the Datangpo microfossil assemblage provides a snapshot of primary producers in an offshore environment between the two Cryogenian global glaciations.

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间冰期近海环境中繁盛的浮游微生物群落：华南低温系大塘坡组硅化微化石

冰川期的全球冰川作用深刻地塑造了地球生态系统的演变。尽管来自低温系地层的化石记录有限，但地球化学和系统发育研究表明，一个活跃的低温系生物圈伴随着关键的进化创新。在本研究中，我们报道了华南扬子地块近岸间冰期环境中低温系大塘坡组的硅化微化石组合。大唐坡组合以球状微化石为主，分三种形态类型，少量为碎片状丝状。形态和结构观察结合拉曼光谱分析表明，该微化石组合可能是一个以蓝藻为主的浮游微生物群落。大唐坡微化石组合中异常硅化的地层学窗口提供了两个冰川期之间近海环境初级生产者的快照。

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来源期刊

Geobiology 生物-地球科学综合

CiteScore

6.80

自引率

5.40%

发文量

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.