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Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden
Linnæus University, Sweden.
British Geological Survey, UK.
Georg-August University, Germany.
Swedish Museum of Natural History, Sweden.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 10, nr 1, artikkel-id 4736Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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. © 2019, The Author(s).

sted, utgiver, år, opplag, sider
Nature Publishing Group , 2019. Vol. 10, nr 1, artikkel-id 4736
Emneord [en]
abiotic factor, anaerobic digestion, bedrock, cap rock, crater, Devonian, methane, methanogenesis, microbial activity, oxidation, shale, Dalarna, Siljan, Sweden
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-40597DOI: 10.1038/s41467-019-12728-yScopus ID: 2-s2.0-85073546979OAI: oai:DiVA.org:ri-40597DiVA, id: diva2:1369613
Merknad

Funding details: Vetenskapsrådet, VR, 04129, 2017–05186, 2017–00766; Funding text 1: Thanks to AB Igrene for access to drill cores, drilling logs and gas data. Swedish research council (contract 2017–05186 to H.D., 2015–04129 to S.S., 2017–04129 to M.I.) and Formas (contract 2017–00766 to H.D. and M.W.) are thanked for financial support. K. Lindén, M. Tillberg, and M. Schmitt are thanked for analytical or sample preparation assistance, and University of Gothenburg for access to SEM. This is NordSIM publication 617 and Vegacenter publication 20.

Tilgjengelig fra: 2019-11-12 Laget: 2019-11-12 Sist oppdatert: 2023-06-07bibliografisk kontrollert

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