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Timing and origin of natural gas accumulation in the Siljan impact structure Sweden

机译:瑞典Siljan撞击结构中天然气聚集的时间和起源

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摘要

Fractured rocks of impact craters may be suitable hosts for deep microbial communities on Earth and potentially other terrestrial planets, yet direct evidence remains elusive. Here, we present a study of the largest crater of Europe, the Devonian Siljan structure, showing that impact structures can be important unexplored hosts for long-term deep microbial activity. Secondary carbonate minerals dated to 80 ± 5 to 22 ± 3 million years, and thus postdating the impact by more than 300 million years, have isotopic signatures revealing both microbial methanogenesis and anaerobic oxidation of methane in the bedrock. Hydrocarbons mobilized from matured shale source rocks were utilized by subsurface microorganisms, leading to accumulation of microbial methane mixed with a thermogenic and possibly a minor abiotic gas fraction beneath a sedimentary cap rock at the crater rim. These new insights into crater hosted gas accumulation and microbial activity have implications for understanding the astrobiological consequences of impacts.
机译:撞击坑的破裂岩石可能是地球以及其他潜在地球行星上深层微生物群落的合适宿主,但直接证据仍然难以捉摸。在这里,我们对欧洲最大的火山口泥盆纪Siljan结构进行了研究,结果表明,撞击结构可能是长期深层微生物活动的重要未开发宿主。次生碳酸盐矿物的年龄为80±5至22±300万年,因此将其影响推迟了3亿多年,具有同位素特征,揭示了基岩中的微生物甲烷化和甲烷的厌氧氧化。从成熟的页岩烃源岩中运出的碳氢化合物被地下微生物利用,导致微生物甲烷的积累,并与火山口边缘沉积盖层下方的生热气体和少量非生物气体混合。这些关于火山口气藏和微生物活动的新见解对理解撞击的天体生物学后果具有启示意义。

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