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首页> 外文期刊>Journal of Asian earth sciences >Organomineralization in Mesoproterozoic giant ooids
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Organomineralization in Mesoproterozoic giant ooids

机译：中元古生代巨卵中的有机金属化

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摘要

Ooids are common carbonate particles that are traditionally considered as abiogenically formed by physical and chemical processes in highly agitated environments. Recent studies point to the importance of microbial activities in ooid formation, but more case studies are required to confirm and clarify the roles of microbes and their organomineralization processes. Here we report an integrated petrographic, element geochemical, and isotopic study of Mesoproterozoic giant ooids from the Wumishan Formation (ca. 1.50-1.45 Ga) of North China. The Wumishan giant ooids (2.0-14.4 mm) are composed of small micritic nuclei and thick radial fibrous cortices. Abundant organic relics, including putative bacterial filaments and mucus-like extracellular polymeric substances (EPS), are present in ooid cortices. Organominerals (e.g., nanoparticles and polyhedrons) are concentrated and lined with the axes of radial fibers, suggesting in situ mineralization of bacterial filaments. The abundance of organic relics and fiber-aligned organominerals confirms the constructive roles of microbes in the formation of the Wumishan giant ooids. The preservation of bacterial filaments/filament bundles in their growth orientation requires fast mineralization in CaCO3-supersaturated environments, which may have been controlled by the shallow chemocline in redox-stratified Mesoproterozoic basins. (C) 2015 Elsevier Ltd. All rights reserved.
机译：类固醇是常见的碳酸盐颗粒，传统上被认为是在高度搅动的环境中通过物理和化学过程非生物形成的。最近的研究指出了微生物活性在卵石形成中的重要性，但是需要更多的案例研究来确认和阐明微生物的作用及其有机矿化过程。在这里，我们报告了来自华北五迷山组（约1.50-1.45 Ga）的中元古代巨石质的岩石学，元素地球化学和同位素研究。雾迷山巨型卵石（2.0-14.4毫米）由微小的微晶核和较厚的放射状纤维皮质组成。卵形皮质中存在丰富的有机文物，包括推定的细菌细丝和粘液样细胞外聚合物（EPS）。浓缩有机材料（例如，纳米颗粒和多面体）并与放射状纤维的轴对齐，这表明细菌细丝在原位矿化。有机文物和纤维排列的有机矿物质的丰富性证实了微生物在雾迷山巨型卵石形成中的建设性作用。细菌细丝/细丝束在其生长方向上的保存要求在CaCO3过饱和的环境中快速矿化，这可能已由氧化还原层化的中元古代盆地中的浅趋化碱控制。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第1期|195-211|共17页
  • 作者

    Tang Dongjie; Shi Xiaoying; Shi Qing; Wu Jinjian; Song Gaoyuan; Jiang Ganqing;

  • 作者单位

    China Univ Geosci, State Key Lab Biol & Environm Geol, Beijing 100083, Peoples R China|China Univ Geosci, Inst Earth Sci, Beijing 100083, Peoples R China;

    China Univ Geosci, State Key Lab Biol & Environm Geol, Beijing 100083, Peoples R China|China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China;

    China Univ Geosci, Inst Earth Sci, Beijing 100083, Peoples R China;

    China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China;

    China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China;

    Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Giant ooids; Bacterial filament bundles; Organominerals; Highly supersaturated seawater; North China;

    机译：巨型卵石;细菌丝束;有机矿物;高度过饱和海水;华北;

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