Heim, Christine N.

[["dc.bibliographiccitation.artnumber","7020"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Drake, Henrik"],["dc.contributor.author","Astrom, Mats E."],["dc.contributor.author","Heim, Christine"],["dc.contributor.author","Broman, Curt"],["dc.contributor.author","Astrom, Jan"],["dc.contributor.author","Whitehouse, Martin J."],["dc.contributor.author","Ivarsson, Magnus"],["dc.contributor.author","Siljestrom, Sandra"],["dc.contributor.author","Sjovall, Peter"],["dc.date.accessioned","2018-11-07T09:57:35Z"],["dc.date.available","2018-11-07T09:57:35Z"],["dc.date.issued","2015"],["dc.description.abstract","Precipitation of exceptionally C-13-depleted authigenic carbonate is a result of, and thus a tracer for, sulphate-dependent anaerobic methane oxidation, particularly in marine sediments. Although these carbonates typically are less depleted in C-13 than in the source methane, because of incorporation of C also from other sources, they are far more depleted in C-13 (delta C-13 as light as - 69% V-PDB) than in carbonates formed where no methane is involved. Here we show that oxidation of biogenic methane in carbon-poor deep groundwater in fractured granitoid rocks has resulted in fracture-wall precipitation of the most extremely C-13-depleted carbonates ever reported, delta C-13 down to - 125% V-PDB. A microbial consortium of sulphate reducers and methane oxidizers has been involved, as revealed by biomarker signatures in the carbonates and S-isotope compositions of co-genetic sulphide. Methane formed at shallow depths has been oxidized at several hundred metres depth at the transition to a deep-seated sulphate-rich saline water. This process is so far an unrecognized terrestrial sink of methane."],["dc.identifier.doi","10.1038/ncomms8020"],["dc.identifier.isi","000355529900003"],["dc.identifier.pmid","25948095"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13588"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37195"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","2041-1723"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Extreme C-13 depletion of carbonates formed during oxidation of biogenic methane in fractured granite"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","4736"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Drake, Henrik"],["dc.contributor.author","Roberts, Nick M. W."],["dc.contributor.author","Heim, Christine"],["dc.contributor.author","Whitehouse, Martin J."],["dc.contributor.author","Siljestrom, Sandra"],["dc.contributor.author","Kooijman, Ellen"],["dc.contributor.author","Broman, Curt"],["dc.contributor.author","Ivarsson, Magnus"],["dc.contributor.author","Astrom, Mats E."],["dc.date.accessioned","2019-11-12T13:26:18Z"],["dc.date.available","2019-11-12T13:26:18Z"],["dc.date.issued","2019"],["dc.description.abstract","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."],["dc.identifier.doi","10.1038/s41467-019-12728-y"],["dc.identifier.pmid","31628335"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16664"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62602"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.eissn","2041-1723"],["dc.relation.issn","2041-1723"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]