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.firstpage","556"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Geobiology"],["dc.bibliographiccitation.lastpage","574"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Drake, Henrik"],["dc.contributor.author","Whitehouse, Martin J."],["dc.contributor.author","Heim, Christine"],["dc.contributor.author","Reiners, Peter W."],["dc.contributor.author","Tillberg, Mikael"],["dc.contributor.author","Hogmalm, K. Johan"],["dc.contributor.author","Dopson, Mark"],["dc.contributor.author","Broman, Curt"],["dc.contributor.author","Astrom, Mats E."],["dc.date.accessioned","2019-07-22T14:49:06Z"],["dc.date.available","2019-07-22T14:49:06Z"],["dc.date.issued","2018"],["dc.description.abstract","In the deep biosphere, microbial sulfate reduction (MSR) is exploited for energy. Here, we show that, in fractured continental crystalline bedrock in three areas in Sweden, this process produced sulfide that reacted with iron to form pyrite extremely enriched in 34 S relative to 32 S. As documented by secondary ion mass spectrometry (SIMS) microanalyses, the δ34 Spyrite values are up to +132‰V-CDT and with a total range of 186‰. The lightest δ34 Spyrite values (-54‰) suggest very large fractionation during MSR from an initial sulfate with δ34 S values (δ34 Ssulfate,0 ) of +14 to +28‰. Fractionation of this magnitude requires a slow MSR rate, a feature we attribute to nutrient and electron donor shortage as well as initial sulfate abundance. The superheavy δ34 Spyrite values were produced by Rayleigh fractionation effects in a diminishing sulfate pool. Large volumes of pyrite with superheavy values (+120 ± 15‰) within single fracture intercepts in the boreholes, associated heavy average values up to +75‰ and heavy minimum δ34 Spyrite values, suggest isolation of significant amounts of isotopically light sulfide in other parts of the fracture system. Large fracture-specific δ34 Spyrite variability and overall average δ34 Spyrite values (+11 to +16‰) lower than the anticipated δ34 Ssulfate,0 support this hypothesis. The superheavy pyrite found locally in the borehole intercepts thus represents a late stage in a much larger fracture system undergoing Rayleigh fractionation. Microscale Rb-Sr dating and U/Th-He dating of cogenetic minerals reveal that most pyrite formed in the early Paleozoic era, but crystal overgrowths may be significantly younger. The δ13 C values in cogenetic calcite suggest that the superheavy δ34 Spyrite values are related to organotrophic MSR, in contrast to findings from marine sediments where superheavy pyrite has been proposed to be linked to anaerobic oxidation of methane. The findings provide new insights into MSR-related S-isotope systematics, particularly regarding formation of large fractions of 34 S-rich pyrite."],["dc.identifier.doi","10.1111/gbi.12297"],["dc.identifier.pmid","29947123"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61836"],["dc.language.iso","en"],["dc.relation.eissn","1472-4669"],["dc.relation.issn","1472-4677"],["dc.title","Unprecedented 34 S-enrichment of pyrite formed following microbial sulfate reduction in fractured crystalline rocks"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","108"],["dc.bibliographiccitation.journal","Earth and Planetary Science Letters"],["dc.bibliographiccitation.lastpage","118"],["dc.bibliographiccitation.volume","470"],["dc.contributor.author","Drake, Henrik"],["dc.contributor.author","Heim, Christine"],["dc.contributor.author","Roberts, Nick M. W."],["dc.contributor.author","Zack, Thomas"],["dc.contributor.author","Tillberg, Mikael"],["dc.contributor.author","Broman, Curt"],["dc.contributor.author","Ivarsson, Magnus"],["dc.contributor.author","Whitehouse, Martin J."],["dc.contributor.author","Astrom, Mats E."],["dc.date.accessioned","2018-11-07T10:21:57Z"],["dc.date.available","2018-11-07T10:21:57Z"],["dc.date.issued","2017"],["dc.description.abstract","Microorganisms produce and consume methane in terrestrial surface environments, sea sediments and, as indicated by recent discoveries, in fractured crystalline bedrock. These processes in the crystalline bedrock remain, however, unexplored both in terms of mechanisms and spatiotemporal distribution. Here we have studied these processes via a multi-method approach including microscale analysis of the stable isotope compositions of calcite and pyrite precipitated in bedrock fractures in the upper crust (down to 1.7 km) at three sites on the Baltic Shield. Microbial processes have caused an intriguing variability of the carbon isotopes in the calcites at all sites, with delta C-13 spanning as much as -93.1 parts per thousand (related to anaerobic oxidation of methane) to +36.5 parts per thousand (related to methanogenesis). Spatiotemporal coupling between the stable isotope measurements and radiometric age determinations (micro-scale dating using new high spatial methods: LA-ICP-MS U-Pb for calcite and Rb-Sr for calcite and co-genetic adularia) enabled unprecedented direct timing constraints of the microbial processes to several periods throughout the Phanerozoic eon, dating back to Devonian times. These events have featured variable fluid salinities and temperatures as shown by fluid inclusions in the calcite; dominantly 70-85 degrees C brines in the Paleozoic and lower temperatures (<50-62 degrees C) and salinities in the Mesozoic. Preserved organic compounds, including plant signatures, within the calcite crystals mark the influence of organic matter in descending surficial fluids on the microbial processes in the fracture system, thus linking processes in the deep and surficial biosphere. These findings substantially extend the recognized temporal and spatial range for production and consumption of methane within the upper continental crust. (C) 2017 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.epsl.2017.04.034"],["dc.identifier.isi","000402944600011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42189"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","1385-013X"],["dc.relation.issn","0012-821X"],["dc.title","Isotopic evidence for microbial production and consumption of methane in the upper continental crust throughout the Phanerozoic eon"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["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"]]

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Drake, Henrik"],["dc.contributor.author","Ivarsson, Magnus"],["dc.contributor.author","Bengtson, Stefan"],["dc.contributor.author","Heim, Christine"],["dc.contributor.author","Siljeström, Sandra"],["dc.contributor.author","Whitehouse, Martin J."],["dc.contributor.author","Broman, Curt"],["dc.contributor.author","Belivanova, Veneta"],["dc.contributor.author","Åström, Mats E."],["dc.date.accessioned","2020-12-10T18:09:44Z"],["dc.date.available","2020-12-10T18:09:44Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1038/s41467-017-00094-6"],["dc.identifier.eissn","2041-1723"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/73742"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Anaerobic consortia of fungi and sulfate reducing bacteria in deep granite fractures"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","702"],["dc.bibliographiccitation.journal","Procedia Earth and Planetary Science"],["dc.bibliographiccitation.lastpage","705"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Drake, Henrik"],["dc.contributor.author","Heim, Christine"],["dc.contributor.author","Whitehouse, Martin"],["dc.contributor.author","Broman, Curt"],["dc.contributor.author","Åström, Mats"],["dc.date.accessioned","2020-12-10T15:20:55Z"],["dc.date.available","2020-12-10T15:20:55Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1016/j.proeps.2016.12.158"],["dc.identifier.issn","1878-5220"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72856"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Episodic Microbial Methanogenesis, Methane Oxidation and Sulfate Reduction in Deep Granite Fractures at Forsmark, Sweden"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]