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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Biogenicity of silicified microbes from a hydrothermal system: relevance to the search for evidence of life on earth and other planets
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Biogenicity of silicified microbes from a hydrothermal system: relevance to the search for evidence of life on earth and other planets

机译：水热系统中硅化微生物的生物源性：与寻找地球和其他行星上的生命证据有关

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摘要

Scanning electron microscopy and microprobe analysis have been used to examine microstructures recovered from a hydrothermal mound at the Trans-Atlantic Geotraverse. Our analyses of hydrothermally precipitated Fe-rich cherts shows strong evidence for silicified microorganisms at depths of less than 1 m. The criteria for biogenicity are morphological similarities to living bacteria and an elevated carbon and nitrogen content with an N/C ratio consistent with marine microbes. The absence of calcium means they can not be confused with abiological carbonate or sulfate artifacts. As a modern analog of Archean hydrothermal sites, our results are informative about the mode of microbial preservation, and because of the shallow extraction and proximity to distinctive topographical features, investigation on hydrothermal sites should optimize future explorations for detecting past or present life on the surface of Earth and other planets.
机译：扫描电子显微镜和微探针分析已用于检查从跨大西洋Geotraverse的热液丘中回收的微观结构。我们对富铁热石的热液沉淀分析表明，硅化微生物的深度小于1 m。生物成因的标准是与活细菌的形态相似，碳和氮含量升高，N / C比与海洋微生物一致。钙的缺乏意味着它们不能与非生物碳酸盐或硫酸盐假象混淆。作为太古宙热液场的现代类似物，我们的研究结果对微生物保存的方式很有帮助，并且由于提取浅且接近独特的地形特征，对热液场的研究应优化未来的探测方法，以探测地表过去或现在的生命地球和其他行星。

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