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Łupki antrakozjowe niecki śródsudeckiej w świetle wskaźników geochemii organicznej : wstępne wyniki analizy bituminów

Dąbek-Głowacka Jolanta, Wójcik-Tabol Patrycja, Nowak Grzegorz J., Wendorff-Belon Małgorzata, Marynowski Leszek

Przegląd Geologiczny

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2023

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Vol. 71, nr 5

269--273

EN

The lacustrine Anthracosia Shales of the Intra-Sudetic Basin are sediments that have become the subject of interest due to their dark colour, indicating an increased content of dispersed organic matter. The published data concern the characteristics of macerals, vitrinite reflectance, the results of Rock-Eval pyrolysis and the results of palynological tests. The above studies were supplemented with the current analysis of the extracted bitumens. The results of the distribution of n-alkanes in the Anthracosia Shales corresponds with the results of macerals and palynology. The dominance of short-chain homologues indicates the microbial-algal origin of the organic matter. Some contribution of terrestrial organic matter is not excluded. Three lithofacies intervals differing geochemically have been distinguished: I - dark grey calcareous claystones rich in aliphatic compounds of microbial and algal origin; II - grey mudstones with siderites containing a lower amount of aliphatic compounds in favour of polar and aromatic compounds; III -weakly calcareous mudstones and sandstones, poor in terrestrial organic matter. The distribution of n-alkanes, phenanthrene and methylphenanthrenes (CPI, MPI, MPR, PP1) shown that the maturity of the organic substance is within the oil window. This is further supported by the Rock-Eval data and vitrinite reflectance values.

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Sugars in environmental samples and sedimentary rocks : effectiveness in derivatization for GC-MS analysis

Smolarek-Lach Justyna, Goryl Magdalena, Marynowski Leszek

Geological Quarterly

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2021

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Vol. 65, No. 3

art. no. 40

EN

Saccharides (sugars), common constituents of the bio- and geosphere, are useful in determining the source of organic matter (OM) in aerosols and early diagenetic phases. Due to the chemical properties and great diversity of sugars in nature, a wide range of techniques is used for the isolation and quantification of saccharides. Here, gas chromatography-mass spectrometry analysis, preceded by derivatization with N-methyl-N-trimethylsilyl-trifluoroacetamide (MSTFA) and N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA), was undertaken. The effectiveness of this derivatization was demonstrated for soils, aerosols, fungi, and individual sugar standards. The efficacy of BSTFA derivatization for individual sugar standards and, similarly, for samples of sugars in winter and summer aerosols was adequate. In fungi and soil samples, the MSTFA reagent was much more effective. Different mono- and disaccharides were identified in biological samples and sedimentary rocks, showing not only the great diversity of these compounds but also the specificity of their origin in recent and ancient OM. Greater variation in the occurrence of sugars in soils compared to rocks may suggest differences in the stability of some saccharides at an early stage of diagenetic transformation. Comparison of the occurrence of certain sugars in biological samples and sedimentary rocks sheds new light on the origin and preservation of these biomolecules.

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The characteristics of organic matter from the Triassic clays of nw margin of the Holy Cross Mts (Poland) — Preliminary report

Marynowski Leszek, Wyszomirski Piotr, Kurkiewicz Sławomir

Mineralogia

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2006

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Vol. 37, iss. 2

113--122

EN

The molecular character of organic matter in Triassic clays on the NW border of the Holy Cross Mts was determined in apolar, aromatic and polar fractions of extractable organic matter (OM) using GC-MS analysis. The contribution of terrestrial higher plants to the kerogene is revealed by the dominant presence of odd long-chain n-alkanes and by the occurrence of retene. Benzophenone, fluorenone, cyclopenta(def)phenanthrenone, antracenone and benzanthrone were among the compounds identified in polar fractions of the soluble organic matter. These commonly originate during strong oxidation of sedimentary organic matter. The aromatic fraction is characterised by the presence of phenyl derivatives (PhPAC) such as phenylnaphthalenes, terphenyls, phenyldibenzofurans and phenylphenanthrenes that are also products of the abiotic oxidation of organic matter. The oxidation processes that occurred during sedimentation and during early diagenesis resulted in a very significant decrease in the organic matter content in the clays. This decrease considerably influences their technological properties.

PL

W pracy przeprowadzono ogólną i molekularną charakterystykę materii organicznej pochodzącej z triasowych iłów NW obrzeżenia Gór Świętokrzyskich. Badaniom poddano frakcje: apolarną, aromatyczną oraz polarną wykorzystując metodę chromatografii gazowej sprzężonej ze spektrometrią mas (GC-MS). Udział lądowych roślin wyższych w składzie kerogenu został stwierdzony na podstawie obecności wśród węglowodorów nasyconych wyraźnej przewagi długołańcuchowych, nieparzystowęglowych n-alkanów nad n-alkanami parzystowęglowymi. Ponadto, wszystkie badane próbki zawierają charakterystyczny dla roślin wyższych biomarker — reten. Frakcje polarne analizowanych próbek zawierają: benzofenon, fluorenon, cyklopenta(def)fenantrenon, antracenon i benzantron. Związki te powstają podczas intensywnego, abiotycznego utleniania materii organicznej. Z kolei we frakcji aromatycznej stwierdzono występowanie fenylowych pochodnych węglowodorów aromatycznych, takich jak: fenylonaftaleny, terfenyle, fenylodibenzofurany i fenylofenantreny, również genetycznie związanych z procesami utleniania. Procesy abiotycznego utleniania materii organicznej zachodzące w trakcie jej depozycji i podczas wczesnej diagenezy spowodowały znaczący spadek zawartości materii organicznej w iłach, co wpłynęło na ich właściwości technologiczne.