期刊
ORGANIC GEOCHEMISTRY
卷 143, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2019.103961
关键词
Phytanyl toluene; Phytanyl benzene; Stable isotopes; GC x GC-ToF-MS; Microbial eogenesis; PAHs
资金
- Australian Research Council (ARC-DORA-Kliti Grice) [DP130100577]
- DFG [Schw554/23, Schw554/29]
- Curtin University
- Institute of Geoscience Research
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 (delta C-13) and pyrite (delta S-34). Here, we used a combination of GC-MS and GC x 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. (C) 2019 Elsevier Ltd. All rights reserved.
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