Aromatization of organic matter induced by the presence of clays during flash pyrolysis-gas chromatography–mass spectrometry (PyGC–MS)

Faure, Pierre; Schlepp, Laurence; Mansuy-Huault, Laurence; Montchowui, Élie; Jardé, Émilie; Pelletier, Manuel

doi:10.1016/j.jaap.2005.02.004

Cited by 53 publications

(22 citation statements)

References 44 publications

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“…However, in the Juncus seed coats, methylated ferulic acid (2) had relatively high abundance during periods of inundation by sand-sized particles, suggesting that the inwash of inorganic material may be responsible for the improved chemical preservation of the seeds. Mineral matrices and clay have been observed to induce the aromatization of OM during pyrolysis (Faure et al, 2006). However, in this study, this effect should not have occurred, as seed coats were isolated from the peat matrix and cleaned before pyrolysis.…”

Section: Diagenetic Changes In Juncus Seed Coats After Burial -Influementioning

confidence: 86%

Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period

Yeloff

Blokker

Bartlett

et al. 2008

Organic Geochemistry

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The influence of past depositional environments on the chemistry of sub-fossil Juncus seed coats (testa) from the top 1 m (corresponding to ca. 900 years of peat accumulation) of a peat bog in the Faroe Islands was examined. The chemistry of the testa of fresh Juncus seeds were characterised using thermally assisted pyrolysis and methylation (THM) in the presence of tetramethyl ammonium hydroxide (TMAH) and 'type' compounds were identified, representative of the major chemical groups in the testa (cellulose-related sugars, lignin-related phenolics, fatty acids). The abundance of the 'type' compounds in the products from sub-fossil testae (the internal tissues of the seeds do not survive beyond the very early stages of decomposition) was then quantified at contiguous 1 cm depth intervals. Major losses of C 18 unsaturated fatty acid methyl esters and sugars were associated with the fresh to sub-fossil transition at ca. 7 cm depth. The preservation of the phenolic ferulic acid in the seed testa appears to be favoured by the input of small basaltic particles from the nearby stream channel. The mechanism by which inwash of inorganic material may be responsible for the improved chemical preservation of the Juncus seed testa is, however, unclear. The sugars were easily metabolised by microorganisms under aerobic conditions of low water table and preserved under anoxic conditions with high water table, suggesting that a drier mire surface may result in the more efficient depletion of polysaccharides and cellulose during the initial stage of decomposition in the acrotelm.

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Section: Diagenetic Changes In Juncus Seed Coats After Burial -Influementioning

confidence: 86%

Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period

Yeloff

Blokker

Bartlett

et al. 2008

Organic Geochemistry

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“…Also, the enriched dibenzofuran homologues in kerogen pyrolysates were observed in only clayish sediments such as black shale and black micrite. Maturation experiments for humic substances with or without clay have shown that clay minerals are efficient catalyst for aromatization (Faure et al, 2006). These things indicated that the relative abundances of dibenzofuran and its derivatives were controlled by lithological characters of sediments.…”

Section: Palaeoenvironmental Variations In the Ptb Recorded By Kerogementioning

confidence: 99%

Kerogen morphology and geochemistry at the Permian–Triassic transition in the Meishan section, South China: Implication for paleoenvironmental variation

Sawada

Kaiho

Okano

2012

Journal of Asian Earth Sciences

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Abstract:Detailed fluorescent microscopic observations and organic geochemical analyses for insoluble sedimentary organic matter (kerogens) are conducted on the end-Permian to earliest Triassic sediments in the Meishan section A of South China. The main objectives of the present study are to reconstruct variations of marine and terrestrial environments, and to evaluate bulk characteristics of terrestrial input in the palaeo-Tethys ocean for the Permian -Triassic boundary (PTB). Most of kerogens in the Meishan section are mainly composed of marine algae-derived amorphous organic matter, while terrestrial plant-derived amorphous organic matter is remarkably dominant in the mass extinction horizon reported previously. The relative abundances of marine organic matter may vary depending on marine production rather than terrestrial input in the palaeo-Tethys associated with changing terrestrial vegetation. We also identified aromatic furans as major compounds in kerogen pyrolysate of all layers. It is possible that sources of aromatic furans with alkyl group, fungi and lichen, proliferated as disaster biota in terrestrial ecosystem through the PTB. Higher abundances of herbaceous organic matter are observed in the layers above the mass extinction horizon. However, the conifer biomarker retene can be identified in kerogen pyrolysates of all layers. These results imply that the productions of herbaceous plants increased as dominant pioneer biota in early stage of recovery for terrestrial ecosystem after its collapse, but also that woody plant potentially continued to be produced in land area throughout the end-Permian and earliest-Triassic.

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“…Previously, few studies demonstrated the adsorption of fatty acids on clay minerals (Meyers and Quinn 1971a, Meyers and Quinn 1973, Balistrieri and Murray 1987, Bayrak 2006, Gautier et al 2009, Drouin et al 2010) and a few simulation studies were conducted by mixing of clay minerals and fatty acids (Nierop and van Bergen 2002, Faure et al 2006a, Faure et al 2006b). The number of these studies is limited especially in aqueous solution due to the solubility limitations of carboxylic acids in water.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Adsorption of tetradecanoic acid on kaolinite minerals: Using flash pyrolysis to characterise the catalytic efficiency of clay mineral adsorbed fatty acids

Zafar

Watson

2017

Chemical Geology

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Aromatization of organic matter induced by the presence of clays during flash pyrolysis-gas chromatography–mass spectrometry (PyGC–MS)

Cited by 53 publications

References 44 publications

Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period

Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period

Kerogen morphology and geochemistry at the Permian–Triassic transition in the Meishan section, South China: Implication for paleoenvironmental variation

Adsorption of tetradecanoic acid on kaolinite minerals: Using flash pyrolysis to characterise the catalytic efficiency of clay mineral adsorbed fatty acids

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