TY  - JOUR
AU  - Nytoft, Hans Peter
AU  - Kildahl-Andersen, Geir
AU  - Lindström, Sofie
AU  - Rise, Frode
AU  - Bechtel, Achim
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Stojanović, Ksenija A.
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2811
AB  - Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian
lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using
NMR-spectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10→20)-abeo-abietane or
icetexane skeleton consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of
the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging fromTriassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis+ trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%Rr) above 0.5 suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetaxanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.
PB  - Elsevier
T2  - Organic Geochemistry
T1  - Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae
DO  - 10.1016/j.orggeochem.2019.01.001
ER  - 

@article{
author = "Nytoft, Hans Peter and Kildahl-Andersen, Geir and Lindström, Sofie and Rise, Frode and Bechtel, Achim and Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Stojanović, Ksenija A.",
year = "2019",
abstract = "Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian
lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using
NMR-spectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10→20)-abeo-abietane or
icetexane skeleton consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of
the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging fromTriassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis+ trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%Rr) above 0.5 suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetaxanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.",
publisher = "Elsevier",
journal = "Organic Geochemistry",
title = "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae",
doi = "10.1016/j.orggeochem.2019.01.001"
}

Nytoft, H. P., Kildahl-Andersen, G., Lindström, S., Rise, F., Bechtel, A., Mitrović, D. D., Đoković, N., Životić, D. R.,& Stojanović, K. A.. (2019). Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae. in Organic Geochemistry
Elsevier..
https://doi.org/10.1016/j.orggeochem.2019.01.001

Nytoft HP, Kildahl-Andersen G, Lindström S, Rise F, Bechtel A, Mitrović DD, Đoković N, Životić DR, Stojanović KA. Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae. in Organic Geochemistry. 2019;.
doi:10.1016/j.orggeochem.2019.01.001 .

Nytoft, Hans Peter, Kildahl-Andersen, Geir, Lindström, Sofie, Rise, Frode, Bechtel, Achim, Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Stojanović, Ksenija A., "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae" in Organic Geochemistry (2019),
https://doi.org/10.1016/j.orggeochem.2019.01.001 . .

TY  - JOUR
AU  - Nytoft, Hans Peter
AU  - Kildahl-Andersen, Geir
AU  - Lindström, Sofie
AU  - Rise, Frode
AU  - Bechtel, Achim
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Stojanović, Ksenija A.
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2846
AB  - Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMR-spectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10 → 20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging from Triassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis + trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%R r ) above 0.5, suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetexanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.
PB  - Elsevier
T2  - Organic Geochemistry
T1  - Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae
VL  - 129
SP  - 14
EP  - 23
DO  - 10.1016/j.orggeochem.2019.01.001
ER  - 

@article{
author = "Nytoft, Hans Peter and Kildahl-Andersen, Geir and Lindström, Sofie and Rise, Frode and Bechtel, Achim and Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Stojanović, Ksenija A.",
year = "2019",
abstract = "Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMR-spectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10 → 20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging from Triassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis + trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%R r ) above 0.5, suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetexanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.",
publisher = "Elsevier",
journal = "Organic Geochemistry",
title = "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae",
volume = "129",
pages = "14-23",
doi = "10.1016/j.orggeochem.2019.01.001"
}

Nytoft, H. P., Kildahl-Andersen, G., Lindström, S., Rise, F., Bechtel, A., Mitrović, D. D., Đoković, N., Životić, D. R.,& Stojanović, K. A.. (2019). Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae. in Organic Geochemistry
Elsevier., 129, 14-23.
https://doi.org/10.1016/j.orggeochem.2019.01.001

Nytoft HP, Kildahl-Andersen G, Lindström S, Rise F, Bechtel A, Mitrović DD, Đoković N, Životić DR, Stojanović KA. Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae. in Organic Geochemistry. 2019;129:14-23.
doi:10.1016/j.orggeochem.2019.01.001 .

Nytoft, Hans Peter, Kildahl-Andersen, Geir, Lindström, Sofie, Rise, Frode, Bechtel, Achim, Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Stojanović, Ksenija A., "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae" in Organic Geochemistry, 129 (2019):14-23,
https://doi.org/10.1016/j.orggeochem.2019.01.001 . .

TY  - CONF
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Obradović, Marko O.
AU  - Bechtel, Achim
AU  - Stojanović, K.
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3823
PB  - European Association of Geoscientists and Engineers, EAGE
C3  - 29th International Meeting on Organic Geochemistry, IMOG 2019
T1  - Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties
DO  - 10.3997/2214-4609.201902880
ER  - 

@conference{
author = "Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Obradović, Marko O. and Bechtel, Achim and Stojanović, K.",
year = "2019",
publisher = "European Association of Geoscientists and Engineers, EAGE",
journal = "29th International Meeting on Organic Geochemistry, IMOG 2019",
title = "Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties",
doi = "10.3997/2214-4609.201902880"
}

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

Mitrović DD, Đoković N, Životić DR, Obradović MO, Bechtel A, Stojanović K. Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties. in 29th International Meeting on Organic Geochemistry, IMOG 2019. 2019;.
doi:10.3997/2214-4609.201902880 .

Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Obradović, Marko O., Bechtel, Achim, Stojanović, K., "Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties" in 29th International Meeting on Organic Geochemistry, IMOG 2019 (2019),
https://doi.org/10.3997/2214-4609.201902880 . .

TY  - JOUR
AU  - Đoković, Nataša
AU  - Mitrović, Danica D.
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Sachsenhofer, Reinhard F.
AU  - Stojanović, Ksenija A.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2077
AB  - The maceral and biomarker characteristics of 4 sublithotypes of xylite-rich coal (SXCs), pale yellow, dark yellow, brown and black, originating from the Kolubara and Kostolac lignite basins were determined. Based on these results, differences in sources and changes of organic matter (OM) resulting in formation of 4 SXCs were established. Conifers (particularly Cupressaceae, Taxodiaceae and Pinacea) had a significant impact on the precursor OM of all SXCs. The contribution of gymnosperm vs. angiosperm vegetation decreased in order pale yellow SXC  gt  dark yellow SXC  gt  brown SXC  gt  black SXC. The distribution of non-hopanoid triterpenoids indicates that change of SXC colour from -yellow to black is associated with reduced input of angiosperm plants from the Betulacea family. Differences in hopane distribution, bitumen content, proportion of short-chain n-alkanes and degree of aromatization of di-and triterpenoids of pale yellow SXC are controlled by microbial communities which took part in the diagenetic alteration of OM. The content of total huminites increased from black to pale yellow SXC, whereas contents of total liptinite and inertinite macerals showed the opposite trend. SXCs differ according to textinite/ulminite ratio, which sharply decreased from pale yellow to black SXC, reflecting increase in gelification of woody tissue. Regarding the composition of liptinite macerals, the SXCs mostly differ according to resinite/liptodetrinite and resinite/suberinite ratios, which are higher in yellow than in brown and black SXC. This result along with values of TOC/N ratio and Carbon Preference Index indicate that the contribution of well preserved woody material, including lignin tissue vs. the impact of epicuticular waxes decreased from yellow to black SXC.
PB  - Slovak Acad Sciences Geological  Inst, Bratislava
T2  - Geologica Carpathica
T1  - Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia)
VL  - 69
IS  - 1
SP  - 51
EP  - 70
DO  - 10.1515/geoca-2018-0004
ER  - 

@article{
author = "Đoković, Nataša and Mitrović, Danica D. and Životić, Dragana R. and Bechtel, Achim and Sachsenhofer, Reinhard F. and Stojanović, Ksenija A.",
year = "2018",
abstract = "The maceral and biomarker characteristics of 4 sublithotypes of xylite-rich coal (SXCs), pale yellow, dark yellow, brown and black, originating from the Kolubara and Kostolac lignite basins were determined. Based on these results, differences in sources and changes of organic matter (OM) resulting in formation of 4 SXCs were established. Conifers (particularly Cupressaceae, Taxodiaceae and Pinacea) had a significant impact on the precursor OM of all SXCs. The contribution of gymnosperm vs. angiosperm vegetation decreased in order pale yellow SXC  gt  dark yellow SXC  gt  brown SXC  gt  black SXC. The distribution of non-hopanoid triterpenoids indicates that change of SXC colour from -yellow to black is associated with reduced input of angiosperm plants from the Betulacea family. Differences in hopane distribution, bitumen content, proportion of short-chain n-alkanes and degree of aromatization of di-and triterpenoids of pale yellow SXC are controlled by microbial communities which took part in the diagenetic alteration of OM. The content of total huminites increased from black to pale yellow SXC, whereas contents of total liptinite and inertinite macerals showed the opposite trend. SXCs differ according to textinite/ulminite ratio, which sharply decreased from pale yellow to black SXC, reflecting increase in gelification of woody tissue. Regarding the composition of liptinite macerals, the SXCs mostly differ according to resinite/liptodetrinite and resinite/suberinite ratios, which are higher in yellow than in brown and black SXC. This result along with values of TOC/N ratio and Carbon Preference Index indicate that the contribution of well preserved woody material, including lignin tissue vs. the impact of epicuticular waxes decreased from yellow to black SXC.",
publisher = "Slovak Acad Sciences Geological  Inst, Bratislava",
journal = "Geologica Carpathica",
title = "Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia)",
volume = "69",
number = "1",
pages = "51-70",
doi = "10.1515/geoca-2018-0004"
}

Đoković, N., Mitrović, D. D., Životić, D. R., Bechtel, A., Sachsenhofer, R. F.,& Stojanović, K. A.. (2018). Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia). in Geologica Carpathica
Slovak Acad Sciences Geological  Inst, Bratislava., 69(1), 51-70.
https://doi.org/10.1515/geoca-2018-0004

Đoković N, Mitrović DD, Životić DR, Bechtel A, Sachsenhofer RF, Stojanović KA. Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia). in Geologica Carpathica. 2018;69(1):51-70.
doi:10.1515/geoca-2018-0004 .

Đoković, Nataša, Mitrović, Danica D., Životić, Dragana R., Bechtel, Achim, Sachsenhofer, Reinhard F., Stojanović, Ksenija A., "Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia)" in Geologica Carpathica, 69, no. 1 (2018):51-70,
https://doi.org/10.1515/geoca-2018-0004 . .

TY  - JOUR
AU  - Đoković, Nataša
AU  - Mitrović, Danica D.
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Sachsenhofer, Reinhard F.
AU  - Matic, Vesna
AU  - Glamocanin, Lidija
AU  - Stojanović, Ksenija A.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2195
AB  - Three Upper Miocene (Pontian) lignite seams are present in the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The origin of their organic matter (OM), 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. Moreover, results of isotopic analysis were used for the investigation of the influence of diagenetic aromatisation on delta C-13 signatures of biomarkers. The studied lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with a strong prevalence of the former. The peat-forming vegetation is dominated by decay resistant conifers, including gymnosperm families Cupressaceae, Taxodiaceae, and Pinaceae. Angiosperms occurred in lower amounts. Minor contribution of ferns, fungi and emergent aquatic macrophyta to the biomass is also evident. Chemoautotrophic- and heterotrophic bacteria played an import role during diagenesis. Diagenetic alterations, associated with change in the number of carbon atoms, influence delta C-13 ratios. Diagenetic aromatisation of di- and non-hopanoid triterpenoids is accompanied with C-13 depletion, whereas aromatisation of hopanoids displays the opposite trend. Peatification proceeded in a fresh water environment under variable, anoxic to slightly oxic redox conditions. The lowermost coal seam III accumulated in a topogenous fresh water peat mire with open water areas, which changed occasionally into a wet forest swamp. This resulted in the deposition of mineral-rich coal. The characteristics of lignite in coal seam II are similar to those of coal seam III. This is supported also by generally similar delta C-13 values of individual biomarkers. Coal seam I is dominated by xylite-rich coal, formed under mesotrophic to ombrotrophic conditions. Rapid flooding of the bogs stopped peat growth in all three coal seams. The ratios of ring-A-degraded and non-degraded aromatic diterpenoids and non-hopanoid triterpenoids, proposed in this study, as well as degree of aromatisation of these biomarkers, reflect changes in the water table. Calorific values of the samples indicate that they meet basic requirements for utilisation in the thermal power plants. None of the lignite samples is suitable for coal briquetting, whereas, based on petrographic data, lignite from coal seam I possesses certain potential for fluidized bed gasification.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia)
VL  - 195
SP  - 139
EP  - 171
DO  - 10.1016/j.coal.2018.06.005
ER  - 

@article{
author = "Đoković, Nataša and Mitrović, Danica D. and Životić, Dragana R. and Bechtel, Achim and Sachsenhofer, Reinhard F. and Matic, Vesna and Glamocanin, Lidija and Stojanović, Ksenija A.",
year = "2018",
abstract = "Three Upper Miocene (Pontian) lignite seams are present in the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The origin of their organic matter (OM), 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. Moreover, results of isotopic analysis were used for the investigation of the influence of diagenetic aromatisation on delta C-13 signatures of biomarkers. The studied lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with a strong prevalence of the former. The peat-forming vegetation is dominated by decay resistant conifers, including gymnosperm families Cupressaceae, Taxodiaceae, and Pinaceae. Angiosperms occurred in lower amounts. Minor contribution of ferns, fungi and emergent aquatic macrophyta to the biomass is also evident. Chemoautotrophic- and heterotrophic bacteria played an import role during diagenesis. Diagenetic alterations, associated with change in the number of carbon atoms, influence delta C-13 ratios. Diagenetic aromatisation of di- and non-hopanoid triterpenoids is accompanied with C-13 depletion, whereas aromatisation of hopanoids displays the opposite trend. Peatification proceeded in a fresh water environment under variable, anoxic to slightly oxic redox conditions. The lowermost coal seam III accumulated in a topogenous fresh water peat mire with open water areas, which changed occasionally into a wet forest swamp. This resulted in the deposition of mineral-rich coal. The characteristics of lignite in coal seam II are similar to those of coal seam III. This is supported also by generally similar delta C-13 values of individual biomarkers. Coal seam I is dominated by xylite-rich coal, formed under mesotrophic to ombrotrophic conditions. Rapid flooding of the bogs stopped peat growth in all three coal seams. The ratios of ring-A-degraded and non-degraded aromatic diterpenoids and non-hopanoid triterpenoids, proposed in this study, as well as degree of aromatisation of these biomarkers, reflect changes in the water table. Calorific values of the samples indicate that they meet basic requirements for utilisation in the thermal power plants. None of the lignite samples is suitable for coal briquetting, whereas, based on petrographic data, lignite from coal seam I possesses certain potential for fluidized bed gasification.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia)",
volume = "195",
pages = "139-171",
doi = "10.1016/j.coal.2018.06.005"
}

Đoković, N., Mitrović, D. D., Životić, D. R., Bechtel, A., Sachsenhofer, R. F., Matic, V., Glamocanin, L.,& Stojanović, K. A.. (2018). Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 195, 139-171.
https://doi.org/10.1016/j.coal.2018.06.005

Đoković N, Mitrović DD, Životić DR, Bechtel A, Sachsenhofer RF, Matic V, Glamocanin L, Stojanović KA. Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). in International Journal of Coal Geology. 2018;195:139-171.
doi:10.1016/j.coal.2018.06.005 .

Đoković, Nataša, Mitrović, Danica D., Životić, Dragana R., Bechtel, Achim, Sachsenhofer, Reinhard F., Matic, Vesna, Glamocanin, Lidija, Stojanović, Ksenija A., "Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia)" in International Journal of Coal Geology, 195 (2018):139-171,
https://doi.org/10.1016/j.coal.2018.06.005 . .

TY  - THES
AU  - Mitrović, Danica D.
PY  - 2018
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=6000
UR  - https://fedorani.ni.ac.rs/fedora/get/o:18254/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=50434831
UR  - http://nardus.mpn.gov.rs/123456789/9879
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2768
AB  - Ispitivani su uzorci lignita, starosti gornjeg miocena (pont), iz ležišta „Kovin“ u cilju utvrđivanja porekla organske supstance (OS) i određivanja karakteristika depozicione sredine. Korišćene su petrografska analiza, grupni organsko-geohemijski parametri, biomarkerska analiza i merenje izotopskog sastava ugljenika (δ13C) pojedinačnih biomarkerskih jedinjenja u zasićenoj i aromatičnoj frakciji uglja...
AB  - Lignite samples from Upper Miocene (Pontian) „Kovin“ deposit were investigated in order to asses the origin of organic matter (OM) and evaluate characteristics of depositional environment. Petrographic analysis, bulk organic geochemical parameters, biomarker analysis and carbon isotopic composition (δ13C) of individual biomarker compounds in saturated and aromatic fraction of coal were used...
PB  - Универзитет у Београду, Хемијски факултет
T2  - Универзитет у Београду
T1  - Rekonstrukcija porekla i paleosredine stvaranja uglja u ležištu "Kovin" na osnovu petrografskih i geohemijskih ispitivanja
UR  - https://hdl.handle.net/21.15107/rcub_nardus_9879
ER  - 

@phdthesis{
author = "Mitrović, Danica D.",
year = "2018",
abstract = "Ispitivani su uzorci lignita, starosti gornjeg miocena (pont), iz ležišta „Kovin“ u cilju utvrđivanja porekla organske supstance (OS) i određivanja karakteristika depozicione sredine. Korišćene su petrografska analiza, grupni organsko-geohemijski parametri, biomarkerska analiza i merenje izotopskog sastava ugljenika (δ13C) pojedinačnih biomarkerskih jedinjenja u zasićenoj i aromatičnoj frakciji uglja..., Lignite samples from Upper Miocene (Pontian) „Kovin“ deposit were investigated in order to asses the origin of organic matter (OM) and evaluate characteristics of depositional environment. Petrographic analysis, bulk organic geochemical parameters, biomarker analysis and carbon isotopic composition (δ13C) of individual biomarker compounds in saturated and aromatic fraction of coal were used...",
publisher = "Универзитет у Београду, Хемијски факултет",
journal = "Универзитет у Београду",
title = "Rekonstrukcija porekla i paleosredine stvaranja uglja u ležištu "Kovin" na osnovu petrografskih i geohemijskih ispitivanja",
url = "https://hdl.handle.net/21.15107/rcub_nardus_9879"
}

Mitrović, D. D.. (2018). Rekonstrukcija porekla i paleosredine stvaranja uglja u ležištu "Kovin" na osnovu petrografskih i geohemijskih ispitivanja. in Универзитет у Београду
Универзитет у Београду, Хемијски факултет..
https://hdl.handle.net/21.15107/rcub_nardus_9879

Mitrović DD. Rekonstrukcija porekla i paleosredine stvaranja uglja u ležištu "Kovin" na osnovu petrografskih i geohemijskih ispitivanja. in Универзитет у Београду. 2018;.
https://hdl.handle.net/21.15107/rcub_nardus_9879 .

Mitrović, Danica D., "Rekonstrukcija porekla i paleosredine stvaranja uglja u ležištu "Kovin" na osnovu petrografskih i geohemijskih ispitivanja" in Универзитет у Београду (2018),
https://hdl.handle.net/21.15107/rcub_nardus_9879 .

TY  - JOUR
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Cvetković, Olga
AU  - Stojanović, Ksenija A.
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2510
AB  - Four lignite lithotypes (matrix coal, xylite-rich coal, mixture of matrix and mineral-rich coal and mixture of matrix and xylite-rich coal), originating from the Kovin deposit, were investigated in detail. The paper was aimed to determine the main maceral, biomarker and isotopic (delta C-13) characteristics of investigated lithotypes. Based on these results the sources and depositional environment of organic matter in 4 lithotypes were established. These samples were also used as substrates for investigation of the influence of diagenetic alteration on delta C-13 signatures of biomarkers, as well as for assessment of the most convenient utilization for each lithotype. The investigated lithotypes differ in accordance with the composition of huminite macerals. Xylite-rich coal notably distinguishes from other lithotypes beacuse of the highest content of conifer resins vs. epicuticular waxes. The mixture of matrix and mineral-rich coal is characterised by the greatest contribution of algae and fungi and the most intense methanotrophic activity at the time of deposition. In all coal lithotypes diagenetic aromatisation influenced isotopic composition of individual biomarkers. Xylite-rich coal has the poorest grindability properties. However, this coal lithotype is the most suitable for fluidized bed gasification, whereas the mixture of matrix and mineral-rich coal has the lowest applicability for this process. The calorific value decreases in order: xylite-rich coal  gt  matrix coal  gt  mixture of matrix and xylite-rich coal  gt  mixture of matrix and mineral-rich coal. The increase of organic carbon content and calorific value is controlled by the increase of contribution of wood vegetation vs. herbaceous peat-forming plants, as well as by stability of water table during peatification.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis
VL  - 82
IS  - 6
SP  - 739
EP  - 754
DO  - 10.2298/JSC161122030M
ER  - 

@article{
author = "Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Bechtel, Achim and Cvetković, Olga and Stojanović, Ksenija A.",
year = "2017",
abstract = "Four lignite lithotypes (matrix coal, xylite-rich coal, mixture of matrix and mineral-rich coal and mixture of matrix and xylite-rich coal), originating from the Kovin deposit, were investigated in detail. The paper was aimed to determine the main maceral, biomarker and isotopic (delta C-13) characteristics of investigated lithotypes. Based on these results the sources and depositional environment of organic matter in 4 lithotypes were established. These samples were also used as substrates for investigation of the influence of diagenetic alteration on delta C-13 signatures of biomarkers, as well as for assessment of the most convenient utilization for each lithotype. The investigated lithotypes differ in accordance with the composition of huminite macerals. Xylite-rich coal notably distinguishes from other lithotypes beacuse of the highest content of conifer resins vs. epicuticular waxes. The mixture of matrix and mineral-rich coal is characterised by the greatest contribution of algae and fungi and the most intense methanotrophic activity at the time of deposition. In all coal lithotypes diagenetic aromatisation influenced isotopic composition of individual biomarkers. Xylite-rich coal has the poorest grindability properties. However, this coal lithotype is the most suitable for fluidized bed gasification, whereas the mixture of matrix and mineral-rich coal has the lowest applicability for this process. The calorific value decreases in order: xylite-rich coal  gt  matrix coal  gt  mixture of matrix and xylite-rich coal  gt  mixture of matrix and mineral-rich coal. The increase of organic carbon content and calorific value is controlled by the increase of contribution of wood vegetation vs. herbaceous peat-forming plants, as well as by stability of water table during peatification.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis",
volume = "82",
number = "6",
pages = "739-754",
doi = "10.2298/JSC161122030M"
}

Mitrović, D. D., Đoković, N., Životić, D. R., Bechtel, A., Cvetković, O.,& Stojanović, K. A.. (2017). Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 82(6), 739-754.
https://doi.org/10.2298/JSC161122030M

Mitrović DD, Đoković N, Životić DR, Bechtel A, Cvetković O, Stojanović KA. Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis. in Journal of the Serbian Chemical Society. 2017;82(6):739-754.
doi:10.2298/JSC161122030M .

Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Bechtel, Achim, Cvetković, Olga, Stojanović, Ksenija A., "Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis" in Journal of the Serbian Chemical Society, 82, no. 6 (2017):739-754,
https://doi.org/10.2298/JSC161122030M . .

TY  - JOUR
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija A.
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2372
AB  - The origin of the organic matter (OM) and the characteristics of the depositional environment of lignites from the Upper Miocene Kovin deposit (hosting three coal seams) of Serbia were evaluated based on petrographic data, bulk organic geochemical parameters, biomarker analysis and stable isotope geochemistry (delta C-13 of individual biomarkers). Samples were collected from four boreholes, GD-601 and GD-603 (the "A" field), and KB-79 and KB-91 (the "B" field), representing different parts of coal seams I, II, and III. Investigated lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with prevalence of the former in most samples. Peat-forming vegetation is characterized by abundant decay resistant gymnosperm (coniferous) plants, followed by a low amount of angiosperms. Lignite forming plants mostly belonged to the gymnosperm families Cupressaceae, Taxodiaceae, Phyllocladaceae and Pinaceae. Slight input of ferns, fungi and aquatic macrophyta to lignite OM is also evident. Distributions of hopanoids and isotopic compositions of these biomarkers reflect the activity of various microbial populations represented by methanotrophic-, chemoautotrophic- and heterotrophic bacteria during diagenesis. Prominent C-28 28,30-bisnorneohop-13(18)-ene was observed for the first time in the lignite extracts. According to the delta C-13 value it was probably derived from chemoautotrophic bacteria. C28 28,30-bisnorneohop-13(18)-ene could be one of the possible precursors of a series of orphan aromatic hopanoids bearing an ethyl group at C-21, via progressive aromatization. Peatification proceeded in a fresh water environment under variable redox conditions, from anoxic to slightly oxic. All three coal seams are heterogeneous. The lower parts of the coal seams represent a topogenous fresh water peat mire with open water areas, which was subjected to inundations. The upper parts of coal seams represent a wet forest swamp with relatively stable conditions. Despite the observed variations in all three coal seams, the mean values of petrographic and organic geochemical parameters suggest general increasing of wetness and establishment of more stable conditions from seam III to seam I. Maceral and biomarker data indicate that rapid flooding of the bogs stopped peat growth in all three coal seams. Relatively frequent variations in all three coal seams, followed by repetition of lignite characteristics depict well the pronounced seasonality e.g. short term cycles of the climate during Late Miocene in investigated area. (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia
VL  - 168
SP  - 80
EP  - 107
DO  - 10.1016/j.coal.2016.07.008
ER  - 

@article{
author = "Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Bechtel, Achim and Šajnović, Aleksandra and Stojanović, Ksenija A.",
year = "2016",
abstract = "The origin of the organic matter (OM) and the characteristics of the depositional environment of lignites from the Upper Miocene Kovin deposit (hosting three coal seams) of Serbia were evaluated based on petrographic data, bulk organic geochemical parameters, biomarker analysis and stable isotope geochemistry (delta C-13 of individual biomarkers). Samples were collected from four boreholes, GD-601 and GD-603 (the "A" field), and KB-79 and KB-91 (the "B" field), representing different parts of coal seams I, II, and III. Investigated lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with prevalence of the former in most samples. Peat-forming vegetation is characterized by abundant decay resistant gymnosperm (coniferous) plants, followed by a low amount of angiosperms. Lignite forming plants mostly belonged to the gymnosperm families Cupressaceae, Taxodiaceae, Phyllocladaceae and Pinaceae. Slight input of ferns, fungi and aquatic macrophyta to lignite OM is also evident. Distributions of hopanoids and isotopic compositions of these biomarkers reflect the activity of various microbial populations represented by methanotrophic-, chemoautotrophic- and heterotrophic bacteria during diagenesis. Prominent C-28 28,30-bisnorneohop-13(18)-ene was observed for the first time in the lignite extracts. According to the delta C-13 value it was probably derived from chemoautotrophic bacteria. C28 28,30-bisnorneohop-13(18)-ene could be one of the possible precursors of a series of orphan aromatic hopanoids bearing an ethyl group at C-21, via progressive aromatization. Peatification proceeded in a fresh water environment under variable redox conditions, from anoxic to slightly oxic. All three coal seams are heterogeneous. The lower parts of the coal seams represent a topogenous fresh water peat mire with open water areas, which was subjected to inundations. The upper parts of coal seams represent a wet forest swamp with relatively stable conditions. Despite the observed variations in all three coal seams, the mean values of petrographic and organic geochemical parameters suggest general increasing of wetness and establishment of more stable conditions from seam III to seam I. Maceral and biomarker data indicate that rapid flooding of the bogs stopped peat growth in all three coal seams. Relatively frequent variations in all three coal seams, followed by repetition of lignite characteristics depict well the pronounced seasonality e.g. short term cycles of the climate during Late Miocene in investigated area. (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia",
volume = "168",
pages = "80-107",
doi = "10.1016/j.coal.2016.07.008"
}

Mitrović, D. D., Đoković, N., Životić, D. R., Bechtel, A., Šajnović, A.,& Stojanović, K. A.. (2016). Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia. in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 168, 80-107.
https://doi.org/10.1016/j.coal.2016.07.008

Mitrović DD, Đoković N, Životić DR, Bechtel A, Šajnović A, Stojanović KA. Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia. in International Journal of Coal Geology. 2016;168:80-107.
doi:10.1016/j.coal.2016.07.008 .

Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Bechtel, Achim, Šajnović, Aleksandra, Stojanović, Ksenija A., "Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia" in International Journal of Coal Geology, 168 (2016):80-107,
https://doi.org/10.1016/j.coal.2016.07.008 . .

TY  - JOUR
AU  - Đoković, Nataša
AU  - Mitrović, Danica D.
AU  - Životić, Dragana R.
AU  - Spanic, Darko
AU  - Troskot-Corbic, Tamara
AU  - Cvetković, Olga
AU  - Stojanović, Ksenija A.
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1717
AB  - The study was aimed at determining the origin and geological evolution of lignites from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The possibility of a rational utilization of the coal was also considered. For this purpose, numerous organic geochemical analyses were applied to representative lignite samples. The obtained results showed that the coal from the Smederevsko Pomoravlje field is a typical humic coal. The peat-forming vegetation was dominated by gymnosperm plants. The coal-forming plants belonged to the gymnosperm families Taxodiaceae, Cupressaceae, Phyllo-cladaceae and Pinaceae. Other precursors of organic matter (OM) were microbial biomass ferns and angiosperms. It was established that peatification occurred in a neutral to slightly acidic, fresh water environment Under anoxic to suboxic redox conditions. The maturity of the OM is low, in the phase of intense diagenetic processes. The biomarker compositions and values of the corresponding parameters revealed that the Smederevsko Pomoravlje field, the Drmno field (Kostolac Basin) and the "A" field (Kovin deposit) represent a part of a unique lignite basin. The results of this study suggest possible rational utilization of the Smederevsko Pomoravlje lignites in thermal power plants. This is particularly related to samples from coal seam I. A significant amount of gas could be generated from lignites at higher maturities. Eight samples met the basic assumptions for effective gasification.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization
VL  - 80
IS  - 4
SP  - 575
EP  - 588
DO  - 10.2298/JSC140219040D
ER  - 

@article{
author = "Đoković, Nataša and Mitrović, Danica D. and Životić, Dragana R. and Spanic, Darko and Troskot-Corbic, Tamara and Cvetković, Olga and Stojanović, Ksenija A.",
year = "2015",
abstract = "The study was aimed at determining the origin and geological evolution of lignites from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The possibility of a rational utilization of the coal was also considered. For this purpose, numerous organic geochemical analyses were applied to representative lignite samples. The obtained results showed that the coal from the Smederevsko Pomoravlje field is a typical humic coal. The peat-forming vegetation was dominated by gymnosperm plants. The coal-forming plants belonged to the gymnosperm families Taxodiaceae, Cupressaceae, Phyllo-cladaceae and Pinaceae. Other precursors of organic matter (OM) were microbial biomass ferns and angiosperms. It was established that peatification occurred in a neutral to slightly acidic, fresh water environment Under anoxic to suboxic redox conditions. The maturity of the OM is low, in the phase of intense diagenetic processes. The biomarker compositions and values of the corresponding parameters revealed that the Smederevsko Pomoravlje field, the Drmno field (Kostolac Basin) and the "A" field (Kovin deposit) represent a part of a unique lignite basin. The results of this study suggest possible rational utilization of the Smederevsko Pomoravlje lignites in thermal power plants. This is particularly related to samples from coal seam I. A significant amount of gas could be generated from lignites at higher maturities. Eight samples met the basic assumptions for effective gasification.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization",
volume = "80",
number = "4",
pages = "575-588",
doi = "10.2298/JSC140219040D"
}

Đoković, N., Mitrović, D. D., Životić, D. R., Spanic, D., Troskot-Corbic, T., Cvetković, O.,& Stojanović, K. A.. (2015). Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 80(4), 575-588.
https://doi.org/10.2298/JSC140219040D

Đoković N, Mitrović DD, Životić DR, Spanic D, Troskot-Corbic T, Cvetković O, Stojanović KA. Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization. in Journal of the Serbian Chemical Society. 2015;80(4):575-588.
doi:10.2298/JSC140219040D .

Đoković, Nataša, Mitrović, Danica D., Životić, Dragana R., Spanic, Darko, Troskot-Corbic, Tamara, Cvetković, Olga, Stojanović, Ksenija A., "Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization" in Journal of the Serbian Chemical Society, 80, no. 4 (2015):575-588,
https://doi.org/10.2298/JSC140219040D . .

TY  - CONF
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Stojanović, Ksenija A.
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2817
PB  - Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften (SDGG)
C3  - 67th Annual Meeting of the International Committee for Coal and Organic Petrology
T1  - Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia
UR  - https://hdl.handle.net/21.15107/rcub_cherry_2817
ER  - 

@conference{
author = "Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Bechtel, Achim and Stojanović, Ksenija A.",
year = "2015",
publisher = "Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften (SDGG)",
journal = "67th Annual Meeting of the International Committee for Coal and Organic Petrology",
title = "Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia",
url = "https://hdl.handle.net/21.15107/rcub_cherry_2817"
}

Mitrović, D. D., Đoković, N., Životić, D. R., Bechtel, A.,& Stojanović, K. A.. (2015). Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia. in 67th Annual Meeting of the International Committee for Coal and Organic Petrology
Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften (SDGG)..
https://hdl.handle.net/21.15107/rcub_cherry_2817

Mitrović DD, Đoković N, Životić DR, Bechtel A, Stojanović KA. Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia. in 67th Annual Meeting of the International Committee for Coal and Organic Petrology. 2015;.
https://hdl.handle.net/21.15107/rcub_cherry_2817 .

Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Bechtel, Achim, Stojanović, Ksenija A., "Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia" in 67th Annual Meeting of the International Committee for Coal and Organic Petrology (2015),
https://hdl.handle.net/21.15107/rcub_cherry_2817 .