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  • English  (6)
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  • 1
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    New Paleoenvironmental Proxies for the Permian Irati Black Shales Based on Acidic O1 and O2 Compounds Assessed by FT-ICR-MS (2021)
    In:  Conference Proceedings
    Details
    Publication Date: 2021-09-29
    Description: Variations of the acidic polar composition of the Early Permian Irati black shales and Serra Alta shales were assessed by ESI(-) FT-ICR-MS to investigate their significance for the paleoenvironmental studies by comparison with known features in the northeastern and central-eastern Paraná Basin (Brazil). The high O〉2 classes in the Serra Alta shales points to high input of terrigenous OM deposited in oxic waters. In addition, seven parameters based on O1 and O2 compounds are proposed as new paleoenvironmental proxies: phenol index (%DBE 4; O1 class); C27/C28 DBE 4 (O1 class); C27/C28 DBE 5 (O1 class); Even/OddFA; TARFA Odd (terrigenous/aquatic ratio); C36 hopanoic acid index; and hopanoic/steranoic acids ratio. Higher values of the phenol index and the TARFA indicate higher land plant input during the final black shale deposition, and higher Even/OddFA to northeastern basin samples reflects their higher content of terrigenous OM. Furthermore, variations of C27/C28 (DBE 4) and C27/C28 (DBE 5) is useful to reconstruct paleosalinity, in which higher values indicate higher salinity. The C36 hopanoic acid index is higher for the marine hypersaline basal samples from the northeastern basin, while a significant bacterial biomass signal is stored as a higher hopanoic/steranoic acids ratio for central-eastern basin samples.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 2
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    Organic Matter Occurrence and Alteration in the Uranium-Rich Alum Shale Formation: Implications for Microbial Activity (2021)
    In:  Conference Proceedings
    Details
    Publication Date: 2021-09-29
    Description: The Early Palaeozoic Alum Shale Formation in northwestern Europe is rich in uranium up to several hundreds of ppm. Despite the absence of higher land plant precursors, the primary Type II kerogen in the Alum Shale has an abnormally strong aromatic character even at low thermal maturities, probably due to α-particle bombardment. FT-ICR-MS data reveal that the macromolecules in the uranium-rich Alum Shale samples are less alkylated than less irradiated counterparts, and that oxygen containing-compounds are enriched in the uranium-rich samples but are not easily degradable into low-molecular-weight products due to irradiation-induced crosslinking. Despite strong organic matter alteration, CO2 and CH4 are formed using U-rich samples in incubation experiments, and DNA-based high-throughput sequencing allows a detailed phylogenetic characterization of the indigenous microbial communities with implications of an uranium-adapted biosphere. The alteration of macromolecular organic matter in the Alum Shale Formation is suggested as an Earth analogue of the Martian surface, in response to α-particle irradiation. Especially a comparison of potential habitats on the Martian surface with Kolm nodules of the Alum Shale in terms of irradiation dosage and organic geochemical characteristics reveals that they have received similar levels of irradiation.
    Language: English
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  • 3
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    Maturation characteristics of samples from the Georgina and Canning basins, as deduced from FT-ICR MS analysis. Geoscience Australia, Canberra. (2020)
    Geoscience Australia
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    Publication Date: 2022-12-05
    Description: As part of the Onshore Energy Systems Group’s program, organic maturation levels were determined using polar compounds from potential source rocks from the Georgina and Canning basins. The Early Paleozoic organic matter is devoid of the vitrinite maceral so unsuitable of the measurement of the industry-standard vitrinite reflectance (Ro%) measurement.
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 4
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    Identification of NSO compounds trapped in fluid inclusions using Ft-Icr-Ms - A case study from the Pannonian Basin (Hungary) (2019)
    In:  Conference Proceedings
    Details
    Publication Date: 2020-02-19
    Description: To the best of our knowledge, this is the first study analysing polar compounds in fluid inclusions oils using ultra high resolution mass spectrometry (FT-ICR-MS). NSO (Nitrogen Sulphur Oxygen) compound compositions of the fluid inclusion oils are compared to those of corresponding produced oils and source and reservoir rock bitumens.
    Language: English
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  • 5
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    NSO Compounds in Oil-Bearing Fluid Inclusions – Development of a Clean-Up Method Suitable for Ft-Icr-Ms Analysis (2019)
    In:  Conference Proceedings
    Details
    Publication Date: 2020-02-19
    Description: This contribution will present the clean-up method as well as preliminary insights into the composition of polar compounds in organic fluid inclusions analysed by FT-ICR-MS
    Language: English
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  • 6
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    NSO-compounds in oil-bearing fluid inclusions revealed by FT-ICR-MS in APPI (+) and ESI (−) modes: A new method development (2020)
    In:  Organic Geochemistry
    Details
    Publication Date: 2022-03-31
    Description: The origins of hydrocarbons occurring in oil-bearing fluid inclusions (FIs) have been studied in detail over the last four decades, but very little is known about co-occurring nitrogen, sulfur and oxygen (NSO)-containing compounds. Here, we outline a new method for gathering valuable information on NSO-compounds using the Fourier Transform-Ion Cyclotron Resonance-Mass Spectrometry (FT-ICR-MS) in combination with Atmospheric Pressure Photoionization in positive ion mode (APPI (+)) and Electrospray Ionization in negative ion mode (ESI (−)). A key element was to develop a rigorous acid-free cleaning protocol to make oil inclusions from a broad range of host materials accessible to the very sensitive FT-ICR-MS technique. Although oil contamination from surrounding organic matter could not be entirely eliminated, the procedure enables distinction of external contaminants and identification of affected NSO-compound classes allowing a conditional interpretation of the FT-results of FI samples, especially for compounds measured in the APPI (+) mode. First insights into the high molecular weight hydrocarbons and NSO-compounds in FI oils are presented here using examples from Germany, Tunisia, Pakistan and Mexico.
    Language: English
    Type: info:eu-repo/semantics/article
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