Mißbach, Helge

[["dc.bibliographiccitation.firstpage","1535"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Biogeosciences"],["dc.bibliographiccitation.lastpage","1548"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Duda, Jan-Peter"],["dc.contributor.author","Thiel, Volker"],["dc.contributor.author","Bauersachs, Thorsten"],["dc.contributor.author","Mißbach, Helge"],["dc.contributor.author","Reinhardt, Manuel"],["dc.contributor.author","Schäfer, Nadine"],["dc.contributor.author","Van Kranendonk, Martin J."],["dc.contributor.author","Reitner, Joachim"],["dc.date.accessioned","2019-07-09T11:45:21Z"],["dc.date.available","2019-07-09T11:45:21Z"],["dc.date.issued","2018"],["dc.description.abstract","Archaean hydrothermal chert veins commonly contain abundant organic carbon of uncertain origin (abiotic vs. biotic). In this study, we analysed kerogen contained in a hydrothermal chert vein from the ca. 3.5 Ga Dresser Formation (Pilbara Craton, Western Australia). Catalytic hydropyrolysis (HyPy) of this kerogen yielded n-alkanes up to n-C22, with a sharp decrease in abundance beyond n-C18. This distribution ( n-C18) is very similar to that observed in HyPy products of recent bacterial biomass, which was used as reference material, whereas it differs markedly from the unimodal distribution of abiotic compounds experimentally formed via Fischer–Tropsch-type synthesis. We therefore propose that the organic matter in the Archaean chert veins has a primarily microbial origin. The microbially derived organic matter accumulated in anoxic aquatic (surface and/or subsurface) environments and was then assimilated, redistributed and sequestered by the hydrothermal fluids (“hydrothermal pump hypothesis”)"],["dc.identifier.doi","10.5194/bg-15-1535-2018"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15113"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59212"],["dc.language.iso","en"],["dc.relation.issn","1726-4189"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.subject.ddc","550"],["dc.title","Ideas and perspectives: hydrothermally driven redistribution and sequestration of early Archaean biomass – the “hydrothermal pump hypothesis”"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","165"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","International Journal of Astrobiology"],["dc.bibliographiccitation.lastpage","175"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Schmidt, B. C."],["dc.contributor.author","Mißbach, Helge"],["dc.contributor.author","Duda, Jan-Peter"],["dc.contributor.author","Luensdorf, Nils Keno"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2020-12-10T15:22:23Z"],["dc.date.available","2020-12-10T15:22:23Z"],["dc.date.issued","2016"],["dc.description.abstract","Lipid biomarkers have been extensively applied for tracing organisms and evolutionary processes through Earth's history. They have become especially important for the reconstruction of early life on Earth and, potentially, for the detection of life in the extraterrestrial realm. However, it is not always clear how exactly biomarkers reflect a paleoecosystem as their preservation may be influenced by increasing temperatures (T) and pressures (P) during burial. While a number of biomarker indices reflecting thermal maturity have been established, it is often less well constrained to which extent biomarker ratios used for paleoreconstruction are compromised by T and P processes. In this study we conducted hydrous pyrolysis of Green River Shale (GRS) kerogen in gold capsules for 2-2400 h at 300 degrees C to assess the maturation behaviour of several compounds used as life tracers and for the reconstruction of paleoenvironments (n-alkanes, pristane, phytane, gammacerane, steranes, hopanes and cheilanthanes). Lignite samples were maturated in parallel with the GRS kerogen to obtain exact vitrinite reflectance data at every sampling point. Our experiment confirms the applicability of biomarker-based indices and ratios as maturity indicators (e.g. total cheilanthanes/hopanes ratio; sterane and hopane isomerization indices). However, several biomarker ratios that are commonly used for paleoreconstructions (e.g. pristane/phytane, pristane/n-C-17, phytane/n-C-18 and total steranes/hopanes) were considerably affected by differences in the thermal degradation behaviour of the respective compounds. Short-term experiments (48 h) performed at 400 degrees C also revealed that biomarkers >C-15 (especially steranes and hopanes) and biological' chain length preferences for n-alkanes are vanished at a vitrinite reflectance between 1.38 and 1.83% R-O. Our data highlight that thermal taphonomy' effects have to be carefully considered in the interpretation of biomarkers in ancient rocks and, potentially, extraterrestrial materials."],["dc.identifier.doi","10.1017/S1473550416000069"],["dc.identifier.eissn","1475-3006"],["dc.identifier.isi","000381033400002"],["dc.identifier.issn","1473-5504"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/73383"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1475-3006"],["dc.relation.issn","1473-5504"],["dc.title","Testing the preservation of biomarkers during experimental maturation of an immature kerogen"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1101"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Mißbach, Helge"],["dc.contributor.author","Duda, Jan-Peter"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Lüders, Volker"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2021-06-18T09:58:08Z"],["dc.date.available","2021-06-18T09:58:08Z"],["dc.date.issued","2021"],["dc.description.abstract","It is widely hypothesised that primeval life utilised small organic molecules as sources of carbon and energy. However, the presence of such primordial ingredients in early Earth habitats has not yet been demonstrated. Here we report the existence of indigenous organic molecules and gases in primary fluid inclusions in c. 3.5-billion-year-old barites (Dresser Formation, Pilbara Craton, Western Australia). The compounds identified (e.g., H2S, COS, CS2, CH4, acetic acid, organic (poly-)sulfanes, thiols) may have formed important substrates for purported ancestral sulfur and methanogenic metabolisms. They also include stable building blocks of methyl thioacetate (methanethiol, acetic acid) - a putative key agent in primordial energy metabolism and thus the emergence of life. Delivered by hydrothermal fluids, some of these compounds may have fuelled microbial communities associated with the barite deposits. Our findings demonstrate that early Archaean hydrothermal fluids contained essential primordial ingredients that provided fertile substrates for earliest life on our planet."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.1038/s41467-021-21323-z"],["dc.identifier.pmid","33597520"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87260"],["dc.identifier.url","https://publications.goettingen-research-online.de/handle/2/82668"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","2041-1723"],["dc.relation.issn","2041-1723"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.rights","CC BY 4.0"],["dc.title","Ingredients for microbial life preserved in 3.5 billion-year-old fluid inclusions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Thiel, Volker"],["dc.contributor.author","Duda, Jan-Peter"],["dc.contributor.author","Kerkhof, Alfons M. van den"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Mißbach, Helge"],["dc.date.accessioned","2020-05-05T14:28:45Z"],["dc.date.available","2020-05-05T14:28:45Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.5194/egusphere-egu2020-9161"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/64859"],["dc.language.iso","en"],["dc.notes","Wegen Corona abgesagt"],["dc.publisher","Copernicus"],["dc.relation.conference","EGU General Assembly 2020"],["dc.relation.eventend","2020-05-08"],["dc.relation.eventlocation","Wien"],["dc.relation.eventstart","2020-05-04"],["dc.relation.ispartof","EGU General Assembly 2020"],["dc.title","Volatile organic compounds in barite-hosted fluid inclusions from the 3.5 Ga old Dresser Formation, Western Australia"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1339"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Astrobiology"],["dc.bibliographiccitation.lastpage","1352"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Mißbach, Helge"],["dc.contributor.author","Steininger, Harald"],["dc.contributor.author","Thiel, Volker"],["dc.contributor.author","Goetz, Walter"],["dc.date.accessioned","2020-12-10T18:16:01Z"],["dc.date.available","2020-12-10T18:16:01Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1089/ast.2018.1997"],["dc.identifier.eissn","1557-8070"],["dc.identifier.issn","1531-1074"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75028"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Investigating the Effect of Perchlorate on Flight-like Gas Chromatography–Mass Spectrometry as Performed by MOMA on board the ExoMars 2020 Rover"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","110"],["dc.bibliographiccitation.journal","Organic Geochemistry"],["dc.bibliographiccitation.lastpage","121"],["dc.bibliographiccitation.volume","119"],["dc.contributor.author","Mißbach, Helge"],["dc.contributor.author","Schmidt, Burkhard C."],["dc.contributor.author","Duda, Jan-Peter"],["dc.contributor.author","Lünsdorf, Nils Keno"],["dc.contributor.author","Goetz, Walter"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2020-05-05T14:28:28Z"],["dc.date.available","2020-05-05T14:28:28Z"],["dc.date.issued","2018"],["dc.description.abstract","Lipid biomarkers are commonly used for tracking life through Earth’s history and are also gaining in importance in the search for extraterrestrial life. However, some lipids may also be formed in-situ via abiotic Fischer-Tropsch-type (FTT) reactions. These processes have been considered as a source of prebiotic organic matter. Here we report on a FTT synthesis experiment performed under hydrothermal conditions, focusing on more complex, previously undescribed FTT reaction products that may potentially mimic biological signals. The experiment was carried out in stainless steel reactors by heating aqueous solutions of oxalic acid mixed with montmorillonite to 175 °C for 3 days. Organic extracts of the products and extraction residues were analyzed by gas chromatography–mass spectrometry (GC–MS) and combustion-infrared detection, attenuated total reflectance Fourier transform infrared spectroscopy and pyrolysis GC–MS. FTT reactions led to a number of biomarker-like lipids such as linear and methyl-branched alkanes and alkanols as well as n-alkanoic acids. However, FTT reactions a priori produce unimodal chain length distributions and isomeric mixtures of methyl-branched compounds, as opposed to biolipids which typically show preferences of individual homologs and/or isomers. Experimental maturation of an immature kerogen demonstrated how these biological signatures may pass into unimodal distributions similar to FTT reaction products by thermal overprint. Therefore, discrimination of biologically derived compounds from FTT organics may become increasingly problematic with ongoing thermal maturation. Extraction residues of FTT reaction products contained organic material, possibly in form of an organic polymer. However, it remains to be tested whether these residual organics can evolve into kerogen-like material."],["dc.identifier.doi","10.1016/j.orggeochem.2018.02.012"],["dc.identifier.scopus","2-s2.0-85044445492"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/64857"],["dc.identifier.url","http://www.scopus.com/inward/record.url?eid=2-s2.0-85044445492&partnerID=MN8TOARS"],["dc.language.iso","en"],["dc.relation.issn","0146-6380"],["dc.title","Assessing the diversity of lipids formed via Fischer-Tropsch-type reactions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]