Aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter
Investigations of aromatic biomarkers extracted from carbonate concretions can contribute to characterization of the enhanced microbial activity that mediates carbonate concretion formation. This microbial footprint can be further inferred from the stable isotopic values of carbonate (δ13C) and pyri...
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| Format: | Journal Article |
| Language: | English |
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PERGAMON-ELSEVIER SCIENCE LTD
2020
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| Online Access: | http://purl.org/au-research/grants/arc/DP130100577 http://hdl.handle.net/20.500.11937/90155 |
| _version_ | 1848765339974762496 |
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| author | Plet, Chloe Grice, Kliti Scarlett, Alan Ruebsam, W. Holman, Alex Schwark, Lorenz |
| author_facet | Plet, Chloe Grice, Kliti Scarlett, Alan Ruebsam, W. Holman, Alex Schwark, Lorenz |
| author_sort | Plet, Chloe |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Investigations of aromatic biomarkers extracted from carbonate concretions can contribute to characterization of the enhanced microbial activity that mediates carbonate concretion formation. This microbial footprint can be further inferred from the stable isotopic values of carbonate (δ13C) and pyrite (δ34S). Here, we used a combination of GC–MS and GC × GC-ToF-MS to compare the aromatic fractions of two Toarcian carbonate concretions from the H. falciferum ammonite zone of the Posidonia Shale (SW-Germany) and their host sediment. The results revealed that n-alkylated and phytanyl arenes were enhanced in the concretions, relative to the host sediment. These findings support a very early diagenetic (eogenetic) microbial source for alkylated and phytanyl arenes derived from the microbial ecosystem mediating concretion formation. In contrast, aromatic compounds formed by thermal maturation (e.g. polycyclic aromatic hydrocarbons, aromatic steroids, organic sulphur compounds) remained invariant in host rock and concretion samples. When combined with bulk sediment and concretion properties, the distribution of aromatic compounds indicates that eogenetic microbial activity upon concretion growth does not diminish organic matter quality. |
| first_indexed | 2025-11-14T11:33:41Z |
| format | Journal Article |
| id | curtin-20.500.11937-90155 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:33:41Z |
| publishDate | 2020 |
| publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-901552023-02-09T06:57:45Z Aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter Plet, Chloe Grice, Kliti Scarlett, Alan Ruebsam, W. Holman, Alex Schwark, Lorenz Science & Technology Physical Sciences Geochemistry & Geophysics Phytanyl toluene Phytanyl benzene Stable isotopes GC x GC-ToF-MS Microbial eogenesis PAHs POSIDONIA BLACK SHALE SW-GERMANY SEA-LEVEL LOWER TOARCIAN ISOTOPIC COMPOSITION ANAEROBIC OXIDATION DIAGENETIC GROWTH CLAY FORMATION ANOXIC EVENT SOUTH CHINA Investigations of aromatic biomarkers extracted from carbonate concretions can contribute to characterization of the enhanced microbial activity that mediates carbonate concretion formation. This microbial footprint can be further inferred from the stable isotopic values of carbonate (δ13C) and pyrite (δ34S). Here, we used a combination of GC–MS and GC × GC-ToF-MS to compare the aromatic fractions of two Toarcian carbonate concretions from the H. falciferum ammonite zone of the Posidonia Shale (SW-Germany) and their host sediment. The results revealed that n-alkylated and phytanyl arenes were enhanced in the concretions, relative to the host sediment. These findings support a very early diagenetic (eogenetic) microbial source for alkylated and phytanyl arenes derived from the microbial ecosystem mediating concretion formation. In contrast, aromatic compounds formed by thermal maturation (e.g. polycyclic aromatic hydrocarbons, aromatic steroids, organic sulphur compounds) remained invariant in host rock and concretion samples. When combined with bulk sediment and concretion properties, the distribution of aromatic compounds indicates that eogenetic microbial activity upon concretion growth does not diminish organic matter quality. 2020 Journal Article http://hdl.handle.net/20.500.11937/90155 10.1016/j.orggeochem.2019.103961 English http://purl.org/au-research/grants/arc/DP130100577 http://creativecommons.org/licenses/by-nc-nd/4.0/ PERGAMON-ELSEVIER SCIENCE LTD fulltext |
| spellingShingle | Science & Technology Physical Sciences Geochemistry & Geophysics Phytanyl toluene Phytanyl benzene Stable isotopes GC x GC-ToF-MS Microbial eogenesis PAHs POSIDONIA BLACK SHALE SW-GERMANY SEA-LEVEL LOWER TOARCIAN ISOTOPIC COMPOSITION ANAEROBIC OXIDATION DIAGENETIC GROWTH CLAY FORMATION ANOXIC EVENT SOUTH CHINA Plet, Chloe Grice, Kliti Scarlett, Alan Ruebsam, W. Holman, Alex Schwark, Lorenz Aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter |
| title | Aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter |
| title_full | Aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter |
| title_fullStr | Aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter |
| title_full_unstemmed | Aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter |
| title_short | Aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter |
| title_sort | aromatic hydrocarbons provide new insight into carbonate concretion formation and the impact of eogenesis on organic matter |
| topic | Science & Technology Physical Sciences Geochemistry & Geophysics Phytanyl toluene Phytanyl benzene Stable isotopes GC x GC-ToF-MS Microbial eogenesis PAHs POSIDONIA BLACK SHALE SW-GERMANY SEA-LEVEL LOWER TOARCIAN ISOTOPIC COMPOSITION ANAEROBIC OXIDATION DIAGENETIC GROWTH CLAY FORMATION ANOXIC EVENT SOUTH CHINA |
| url | http://purl.org/au-research/grants/arc/DP130100577 http://hdl.handle.net/20.500.11937/90155 |