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首页> 外文期刊>Nature >Evidence from fluid inclusions for microbial methanogenesis in the early Archaean era.
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Evidence from fluid inclusions for microbial methanogenesis in the early Archaean era.

机译：来自古细菌时代早期的甲烷甲烷生成的流体包裹体的证据。

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摘要

Methanogenic microbes may be one of the most primitive organisms, although it is uncertain when methanogens first appeared on Earth. During the Archaean era (before 2.5 Gyr ago), methanogens may have been important in regulating climate, because they could have provided sufficient amounts of the greenhouse gas methane to mitigate a severely frozen condition that could have resulted from lower solar luminosity during these times. Nevertheless, no direct geological evidence has hitherto been available in support of the existence of methanogens in the Archaean period, although circumstantial evidence is available in the form of approximately 2.8-Gyr-old carbon-isotope-depleted kerogen. Here we report crushing extraction and carbon isotope analysis of methane-bearing fluid inclusions in approximately 3.5-Gyr-old hydrothermal precipitates from Pilbara craton, Australia. Our results indicate that the extracted fluids contain microbial methane with carbon isotopic compositions of less than -56 per thousand included within original precipitates. This provides the oldest evidence of methanogen (> 3.46 Gyr ago), pre-dating previous geochemical evidence by about 700 million years.
机译：产甲烷微生物可能是最原始的生物之一，尽管尚不确定产甲烷菌何时首次出现在地球上。在古细菌时代（2.5 Gyr之前），产甲烷菌可能在调节气候方面很重要，因为它们可能提供了足够量的温室气体，以缓解由于这段时期太阳光度降低而导致的严酷冻结条件。然而，尽管间接证据以大约2.8 Gyr的碳同位素贫化的干酪根形式存在，但迄今为止，尚无直接的地质证据来支持古细菌时代产甲烷菌的存在。在这里，我们报告了澳大利亚Pilbara克拉顿约3.5年前的热液沉淀物中含甲烷的流体包裹体的压碎提取和碳同位素分析。我们的结果表明，提取液中的微生物甲烷中原始沉淀物所含的碳同位素组成小于-56 /千。这提供了最古老的产甲烷证据（> 3.46 Gyr之前），比以前的地球化学证据早了约7亿年。

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