TY  - CONF
AU  - Kojić, I.
AU  - Kus, J.
AU  - Životić, D.
AU  - Stojanović, Ksenija A.
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5191
AB  - The organic geochemical study of Lower and Middle Miocene lignites from the coal-mining district of Lusatia in eastern Germany has been performed. Since the samples showed a uniform and low degree of maturity (0.32-0.37 %Rr), it can be considered that maturity has no significant impact on biomarker distributions. Therefore, the objective of the study is to examine the potential of biomarkers to distinguish Lower and Middle Miocene lignites in relation to sources and depositional environment of organic matter (OM). The biomarker patterns show relatively similar compositions in studied lignites, indicating no significant change in palaeclimate from Lower to Middle Miocene. Middle Miocene lignites are characterized by more pronounced variations of biomarker signatures due to the more pronounced fluctuation of water-level and/or palaeo-wildfires. Peatification was performed under stable water-level. The main differences between Middle and Lower Miocene coals are expressed by higher dehydroicetexane content, Paq index, the tetracyclic/tricyclic diterpanes ratio and non-hopanoid triterpenoids content, as well as by lower content of hopenes and fernenes in the latter one. Mentioned results indicate decreasing contribution of Cupressaceae and emergent macrophytes, associated with increased input of Pinaceae, angiosperms and ferns to the precursor OM of Middle Miocene samples in comparison to Lower Miocene samples.
PB  - European Association of Geoscientists & Engineers
C3  - Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)
T1  - The potential of biomarkers to distinguish Lower and Middle Miocene lignites from the coal-mining district of Lusatia
VL  - 2021
DO  - 10.3997/2214-4609.202134092
ER  - 

@conference{
author = "Kojić, I. and Kus, J. and Životić, D. and Stojanović, Ksenija A.",
year = "2021",
abstract = "The organic geochemical study of Lower and Middle Miocene lignites from the coal-mining district of Lusatia in eastern Germany has been performed. Since the samples showed a uniform and low degree of maturity (0.32-0.37 %Rr), it can be considered that maturity has no significant impact on biomarker distributions. Therefore, the objective of the study is to examine the potential of biomarkers to distinguish Lower and Middle Miocene lignites in relation to sources and depositional environment of organic matter (OM). The biomarker patterns show relatively similar compositions in studied lignites, indicating no significant change in palaeclimate from Lower to Middle Miocene. Middle Miocene lignites are characterized by more pronounced variations of biomarker signatures due to the more pronounced fluctuation of water-level and/or palaeo-wildfires. Peatification was performed under stable water-level. The main differences between Middle and Lower Miocene coals are expressed by higher dehydroicetexane content, Paq index, the tetracyclic/tricyclic diterpanes ratio and non-hopanoid triterpenoids content, as well as by lower content of hopenes and fernenes in the latter one. Mentioned results indicate decreasing contribution of Cupressaceae and emergent macrophytes, associated with increased input of Pinaceae, angiosperms and ferns to the precursor OM of Middle Miocene samples in comparison to Lower Miocene samples.",
publisher = "European Association of Geoscientists & Engineers",
journal = "Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)",
title = "The potential of biomarkers to distinguish Lower and Middle Miocene lignites from the coal-mining district of Lusatia",
volume = "2021",
doi = "10.3997/2214-4609.202134092"
}

Kojić, I., Kus, J., Životić, D.,& Stojanović, K. A.. (2021). The potential of biomarkers to distinguish Lower and Middle Miocene lignites from the coal-mining district of Lusatia. in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)
European Association of Geoscientists & Engineers., 2021.
https://doi.org/10.3997/2214-4609.202134092

Kojić I, Kus J, Životić D, Stojanović KA. The potential of biomarkers to distinguish Lower and Middle Miocene lignites from the coal-mining district of Lusatia. in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021). 2021;2021.
doi:10.3997/2214-4609.202134092 .

Kojić, I., Kus, J., Životić, D., Stojanović, Ksenija A., "The potential of biomarkers to distinguish Lower and Middle Miocene lignites from the coal-mining district of Lusatia" in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021), 2021 (2021),
https://doi.org/10.3997/2214-4609.202134092 . .

TY  - CONF
AU  - Mitrović, D.
AU  - Đoković, N.
AU  - Životić, D.
AU  - Bechtel, A.
AU  - Sachsenhofer, R.F.
AU  - Obradović, M.
AU  - Stojanović, Ksenija A.
PY  - 2019
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5186
PB  - Geological Institute and Institute of Organic Chemisrtry with Centre of Phytochemistry of the Bulgarian Academy of Sciences, Sofia
C3  - Workshop “Organic matter transformations in Maritsa Iztok dump materials: view by geochemical proxies”, Sofia, Bulgaria, June 25-28, 2019. Abstract Book
T1  - Petrographical and biomarker study of lignite lithotypes and sublithotypes of xylite-rich coal (Kolubara Basin, Serbia)
SP  - 14
EP  - 15
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5186
ER  - 

@conference{
author = "Mitrović, D. and Đoković, N. and Životić, D. and Bechtel, A. and Sachsenhofer, R.F. and Obradović, M. and Stojanović, Ksenija A.",
year = "2019",
publisher = "Geological Institute and Institute of Organic Chemisrtry with Centre of Phytochemistry of the Bulgarian Academy of Sciences, Sofia",
journal = "Workshop “Organic matter transformations in Maritsa Iztok dump materials: view by geochemical proxies”, Sofia, Bulgaria, June 25-28, 2019. Abstract Book",
title = "Petrographical and biomarker study of lignite lithotypes and sublithotypes of xylite-rich coal (Kolubara Basin, Serbia)",
pages = "14-15",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5186"
}

Mitrović, D., Đoković, N., Životić, D., Bechtel, A., Sachsenhofer, R.F., Obradović, M.,& Stojanović, K. A.. (2019). Petrographical and biomarker study of lignite lithotypes and sublithotypes of xylite-rich coal (Kolubara Basin, Serbia). in Workshop “Organic matter transformations in Maritsa Iztok dump materials: view by geochemical proxies”, Sofia, Bulgaria, June 25-28, 2019. Abstract Book
Geological Institute and Institute of Organic Chemisrtry with Centre of Phytochemistry of the Bulgarian Academy of Sciences, Sofia., 14-15.
https://hdl.handle.net/21.15107/rcub_cherry_5186

Mitrović D, Đoković N, Životić D, Bechtel A, Sachsenhofer R, Obradović M, Stojanović KA. Petrographical and biomarker study of lignite lithotypes and sublithotypes of xylite-rich coal (Kolubara Basin, Serbia). in Workshop “Organic matter transformations in Maritsa Iztok dump materials: view by geochemical proxies”, Sofia, Bulgaria, June 25-28, 2019. Abstract Book. 2019;:14-15.
https://hdl.handle.net/21.15107/rcub_cherry_5186 .

Mitrović, D., Đoković, N., Životić, D., Bechtel, A., Sachsenhofer, R.F., Obradović, M., Stojanović, Ksenija A., "Petrographical and biomarker study of lignite lithotypes and sublithotypes of xylite-rich coal (Kolubara Basin, Serbia)" in Workshop “Organic matter transformations in Maritsa Iztok dump materials: view by geochemical proxies”, Sofia, Bulgaria, June 25-28, 2019. Abstract Book (2019):14-15,
https://hdl.handle.net/21.15107/rcub_cherry_5186 .

TY  - CONF
AU  - Mitrović, D.
AU  - Đoković, N.
AU  - Životić, D.
AU  - Obradović, M.
AU  - Bechtel, A.
AU  - Stojanović, Ksenija A.
PY  - 2019
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5174
AB  - Maceral and biomarker composition of different lignite lithotypes: matrix-coal, pale yellow xylite-rich coal, dark yellow xylite-rich coal, brown xylite-rich coal, mineral-rich coal and dopplerite originating from the Upper Miocene (“Pontian”) Kostolac Basin, Serbia was studied in detail. The objective was to establish the sources of organic matter and to determine palaeoenvironmental conditions which resulted in formation of different lignite lithotypes. Moreover, the influence of lignite lithotypes on grindability properties has also been assessed. 
Mineral-rich coal was formed in topogenous fresh water peat mire with open water areas. Formation of matrix coal was performed in reed march. The peatification of pale yellow- and dark yellow xylite proceeded in dry forest swamp. Brown xylite was formed in wet forest swamp, whereas dopplerite could have formed during transition of wet forest swamp into bush mire. Contents of liptinites, inertinites, gelinite, mineral matter, sesquiterpenoids, hopanoids and n-alkanes have positive impact on Hardgrove Grindability Index (HGI), whereas total huminites, telohuminite and total organic carbon content, as well as retene/2-methyl, 1-(4’-methylpentyl), 6-isopropylnaphthalene ratio exhibited negative influence on HGI.
PB  - European Association of Geoscientists & Engineers
C3  - Conference Proceedings, 29th International Meeting on Organic Geochemistry
T1  - Maceral and biomarker composition of lignite lithotypes – implications on palaeoenvironment and grindability properties
VL  - 2019
DO  - 10.3997/2214-4609.201902880
ER  - 

@conference{
author = "Mitrović, D. and Đoković, N. and Životić, D. and Obradović, M. and Bechtel, A. and Stojanović, Ksenija A.",
year = "2019",
abstract = "Maceral and biomarker composition of different lignite lithotypes: matrix-coal, pale yellow xylite-rich coal, dark yellow xylite-rich coal, brown xylite-rich coal, mineral-rich coal and dopplerite originating from the Upper Miocene (“Pontian”) Kostolac Basin, Serbia was studied in detail. The objective was to establish the sources of organic matter and to determine palaeoenvironmental conditions which resulted in formation of different lignite lithotypes. Moreover, the influence of lignite lithotypes on grindability properties has also been assessed. 
Mineral-rich coal was formed in topogenous fresh water peat mire with open water areas. Formation of matrix coal was performed in reed march. The peatification of pale yellow- and dark yellow xylite proceeded in dry forest swamp. Brown xylite was formed in wet forest swamp, whereas dopplerite could have formed during transition of wet forest swamp into bush mire. Contents of liptinites, inertinites, gelinite, mineral matter, sesquiterpenoids, hopanoids and n-alkanes have positive impact on Hardgrove Grindability Index (HGI), whereas total huminites, telohuminite and total organic carbon content, as well as retene/2-methyl, 1-(4’-methylpentyl), 6-isopropylnaphthalene ratio exhibited negative influence on HGI.",
publisher = "European Association of Geoscientists & Engineers",
journal = "Conference Proceedings, 29th International Meeting on Organic Geochemistry",
title = "Maceral and biomarker composition of lignite lithotypes – implications on palaeoenvironment and grindability properties",
volume = "2019",
doi = "10.3997/2214-4609.201902880"
}

Mitrović, D., Đoković, N., Životić, D., Obradović, M., Bechtel, A.,& Stojanović, K. A.. (2019). Maceral and biomarker composition of lignite lithotypes – implications on palaeoenvironment and grindability properties. in Conference Proceedings, 29th International Meeting on Organic Geochemistry
European Association of Geoscientists & Engineers., 2019.
https://doi.org/10.3997/2214-4609.201902880

Mitrović D, Đoković N, Životić D, Obradović M, Bechtel A, Stojanović KA. Maceral and biomarker composition of lignite lithotypes – implications on palaeoenvironment and grindability properties. in Conference Proceedings, 29th International Meeting on Organic Geochemistry. 2019;2019.
doi:10.3997/2214-4609.201902880 .

Mitrović, D., Đoković, N., Životić, D., Obradović, M., Bechtel, A., Stojanović, Ksenija A., "Maceral and biomarker composition of lignite lithotypes – implications on palaeoenvironment and grindability properties" in Conference Proceedings, 29th International Meeting on Organic Geochemistry, 2019 (2019),
https://doi.org/10.3997/2214-4609.201902880 . .

TY  - CONF
AU  - Kojić, I.
AU  - Bechtel, A.
AU  - Sachsenhofer, R.F.
AU  - Životić, D.
AU  - Stojanović, Ksenija A.
PY  - 2019
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5173
AB  - Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis were studied. The maturity ratios based on biomarkers and alkylaromatics which showed the best applicability were determined. Intensity of observed changes of maturity ratios decreases in the following order: mineral-rich coal > matrix coal > xylite-rich coal, indicating that mineral matter, which is dominated by clays in all lithotypes, plays an important role in the isomerisation of polycyclic biomarkers and aromatic compounds. Carbon isotopic signatures of n-C25 and n-C27 alkanes, as well as δ13C values of phenathrene and cadalene are very close in studied range of maturity, confirming that isotopic signatures are useful tracers for alteration products of biological molecules. Long-chain homologues of n-alkanes exhibit slight enrichment in 12C with increasing maturity, whereas almost no change is detected in δ13C of short-chain n-alkanes. Negligible enrichment in 13C of aromatic compounds is observed during maturation.
PB  - European Association of Geoscientists & Engineers
C3  - Conference Proceedings, 29th International Meeting on Organic Geochemistry
T1  - Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis
VL  - 2019
DO  - 10.3997/2214-4609.201903023
ER  - 

@conference{
author = "Kojić, I. and Bechtel, A. and Sachsenhofer, R.F. and Životić, D. and Stojanović, Ksenija A.",
year = "2019",
abstract = "Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis were studied. The maturity ratios based on biomarkers and alkylaromatics which showed the best applicability were determined. Intensity of observed changes of maturity ratios decreases in the following order: mineral-rich coal > matrix coal > xylite-rich coal, indicating that mineral matter, which is dominated by clays in all lithotypes, plays an important role in the isomerisation of polycyclic biomarkers and aromatic compounds. Carbon isotopic signatures of n-C25 and n-C27 alkanes, as well as δ13C values of phenathrene and cadalene are very close in studied range of maturity, confirming that isotopic signatures are useful tracers for alteration products of biological molecules. Long-chain homologues of n-alkanes exhibit slight enrichment in 12C with increasing maturity, whereas almost no change is detected in δ13C of short-chain n-alkanes. Negligible enrichment in 13C of aromatic compounds is observed during maturation.",
publisher = "European Association of Geoscientists & Engineers",
journal = "Conference Proceedings, 29th International Meeting on Organic Geochemistry",
title = "Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis",
volume = "2019",
doi = "10.3997/2214-4609.201903023"
}

Kojić, I., Bechtel, A., Sachsenhofer, R.F., Životić, D.,& Stojanović, K. A.. (2019). Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis. in Conference Proceedings, 29th International Meeting on Organic Geochemistry
European Association of Geoscientists & Engineers., 2019.
https://doi.org/10.3997/2214-4609.201903023

Kojić I, Bechtel A, Sachsenhofer R, Životić D, Stojanović KA. Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis. in Conference Proceedings, 29th International Meeting on Organic Geochemistry. 2019;2019.
doi:10.3997/2214-4609.201903023 .

Kojić, I., Bechtel, A., Sachsenhofer, R.F., Životić, D., Stojanović, Ksenija A., "Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis" in Conference Proceedings, 29th International Meeting on Organic Geochemistry, 2019 (2019),
https://doi.org/10.3997/2214-4609.201903023 . .