scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia)

TL;DR: In this paper, three Upper Miocene (Pontian) lignite seams are present in the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) and the origin of their organic matter, the characteristics of the depositional environment and certain utilisation properties have been evaluated based on petrographic data, bulk organic geochemical parameters, biomarker patterns and their isotope signatures.
About: This article is published in International Journal of Coal Geology.The article was published on 2018-07-01 and is currently open access. It has received 15 citations till now. The article focuses on the topics: Coal & Peat.

Summary (2 min read)

Introduction

  • Lignite is one of the main energy resources in central and southeast Europe.
  • According to their macropetrographic composition, structure and texture, lignites can be classified into several lithotypes.
  • The most important Serbian lignite basins belong to the Pannonian Basin System and were formed in shallow lacustrine, delta plain and fluvial environments during the Miocene.

Methods

  • Two representative feed lignite samples (mass ~ 5 kg of each) from the Kolubara and the Kostolac basins were collected from the pre-boiler mills of thermal power plants “Nikola Tesla” and “Kostolac B”, respectively.
  • Four sublithotypes of xylite-rich coal (SXCs; pale yellow, dark yellow, brown and black), from each basin, in total 8 samples, were further analysed in detail (Table 1).
  • The saturated and aromatic hydrocarbon fractions were analysed by gas chromatography-mass spectrometry (GC-MS).
  • A gas chromatograph equipped with a 30 m DB-5MS fused silica capillary column (i.d. 0.25 mm; 0.25 μm film thickness) coupled to a Thermo Scientific ISQ quadrupole mass spectrometer was used.

Results and discussion

  • Bulk organic geochemical parameters TOC contents (Table 1) are generally similar (55–61 %) with the exception of pale yellow SXC from the Kolubara Basin, which shows a lower amount (48 %).
  • All investigated samples are dominated by diterpenoids, followed by non-hopanoid triterpenoids and n-alkanes (Figs. 4–7; Table 2).
  • Since distributions of n-alkanes (see Section n-Alkanes and isoprenoids) showed that these biomarkers mostly originated from epicuticular waxes, the obtained result may indicate lower contribution of waxes to yellow SXCs in comparison to brown and black SXCs.
  • All the samples from the Kolubara Basin, with exception of pale yellow SXC, have higher contents of hopanoids than samples from the Kostolac Basin (Table 2) indicating more intense microbial activity and peatification in a slightly more oxic environment, which is consistent with a lower amount of sulphur (Table 1).

Maceral composition of SXCs

  • The observed differences in biomarker distributions of SXCs, related to difference in sources and diagenetic alteration of OM, are also reflected in petrographic characteristics.
  • Regarding the composition of huminite group macerals, in accordance with the published data, SXCs differ by the textinite/ulminite ratio which sharply decreased in the order: pale yellow SXC > dark yellow SXC > brown SXC > black SXC (Table 4).
  • Attrinite and gelinite showed negative correlation with the content of total diterpenoids, sesquiterpenoids and triterpenoids having ursane and lupane skeleton, whereas positive correlations were observed between these macerals and contents of n-alkanes (particularly, C26– C33 long-chain homologues) and hopanoids.
  • A typical feature of yellow SXCs is the prevalence of resinite over liptodetrinite, while brown and black SXCs showed the opposite trend in both basins.
  • The absence of relationships between contents of individual inertinite macerals and xylite sublithotype could be attributed to heterogeneity (Borrego et al. 1997, 2000) and possible allochthonous origin of inertinite macerals (O’Keefe et al. 2013).

Conclusions

  • The petrographic composition and biomarker assemblages of four SXCs (pale yellow, dark yellow, brown and black) originating from the most important lignite basins in Serbia were studied.
  • The proportions of diterpenoids decrease in the following order: pale yellow SXC > dark yellow SXC > brown SXC > black SXC, whereas proportions of all other biomarkers increase in the opposite trend, with the exception of sesquiterpenoids which showed slightly higher proportions in brown than in black SXC from both basins.
  • Distributions of biomarkers indicate that the contribution of arboreal vegetation vs. impact of herbaceous peat-forming plants decreased in the order: pale yellow SXC > dark yellow SXC > brown SXC > black SXC, which resulted in reduction of tissue preservation.
  • The lower contribution of epicuticular waxes to pale yellow SXC is also confirmed by the lowest content of liptinite macerals and total n-alkanes in this sublithotype.
  • SXCs differ according to the textinite/ulminite ratio which notably decreased in the order: pale yellow > dark yellow > brown > black.

Did you find this useful? Give us your feedback

Figures (13)
Citations
More filters
Journal ArticleDOI
TL;DR: In this article, the coal-petrographical, mineralogical and organic geochemical features of samples collected from two deep cores were analyzed for the Kinik coalfield.

30 citations

Journal ArticleDOI
TL;DR: In this paper, the carbon isotopic compositions of biomarkers from Polish lignite are reported for the first time, and a positive relationship exists between the di-/(di- + tri-) terpenoid ratios and δ13C of lignitic samples, indicating the dominating role of varying gymnosperm/angiosperm contributions on the carbon-isotope composition of Lignite.

14 citations

Journal ArticleDOI
TL;DR: In this paper, the origin of the organic matter (OM) in 62 samples is evaluated on the basis of gas chromatography-mass spectrometry (GC-MS and GC-MS/MS).

13 citations

Journal ArticleDOI
TL;DR: In this paper, single pieces of fossil wood fragments (xylites) were collected from the middle Miocene First Lusatian lignite seam at the Adamow, Joźwin IIB and Tomislawice opencast mines and are characterized by maceral variety, cellulose contents and their molecular and isotopic composition.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the terpenoid biomarker compositions indicate the contribution of conifers and angiosperms to peat formation in coal seams in the Russian Primorye and Sakhalin regions.

10 citations

References
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors present a mathematical model to predict the overall isotope discrimination in terms of diffusion, interconversion, incorporation, and respiration in C 3, C 4 and crassulacean acid metabolism (CAM) photosynthetic pathways.

2,065 citations

Journal ArticleDOI
TL;DR: δ 13C/12C ratios have been determined for plant tissue from 104 species representing 60 families and photosynthetic fractionation leading to such values is discussed.
Abstract: 13C/12C ratios have been determined for plant tissue from 104 species representing 60 families. Higher plants fall into two categories, those with low δPDBI13C values (—24 to —34‰) and those with high δ 13C values (—6 to —19‰). Algae have δ 13C values of —12 to —23‰. Photosynthetic fractionation leading to such values is discussed.

1,943 citations

Journal ArticleDOI
16 Mar 1978-Nature
TL;DR: In this article, the role of oxic and anoxic sedimentary environments is evaluated using a combination of geochemical parameters such as lipid composition, sulphur and organic pigments.
Abstract: Our increasing knowledge of the geochemical processes of present-day sedimentation conditions provides a basis for evaluating the role of oxic and anoxic sedimentary environments. In particular, there are organic geochemical parameters, such as lipid composition, sulphur and organic pigments, which link Recent sediments with their geologically older counterparts, and these may therefore be used to assign the depositional palaeoenvironments of ancient sediments and petroleums.

1,902 citations

Journal ArticleDOI
TL;DR: It is indicated that inferences drawn from sterol distributions regarding sources of organic matter must be made with caution and should be supported using other lipid data, and that in ancient sediments and crude oils a high proportion of C 29 steranes need not indicate that most of the organic matter was derived from vascular plants.

1,713 citations

Journal ArticleDOI
TL;DR: A preference for n-paraffins with odd numbers of carbon atoms is widespread in Recent sediments as discussed by the authors. But the results of the analysis showed no preference in the heavy n -paraifins for molecules of either odd- or even-carbon number.

1,556 citations

Frequently Asked Questions (1)
Q1. What are the contributions mentioned in the paper "Petrographic and biomarker analysis of xylite-rich coal from the kolubara and kostolac lignite basins (pannonian basin, serbia)" ?

In this paper, Bechtel et al. investigated the differences of precursor organic matter which resulted in the formation of four different xylite-rich coal ( SXC ) sublithotypes.