Petrology and geochemistry of the Carboniferous cutinite-rich coals from the Hequ area of Shanxi Province, China
Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spec...
Ausführliche Beschreibung
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| Autor*in: |
Song, Daofu [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2022 |
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| Anmerkung: |
© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 |
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| Übergeordnetes Werk: |
Enthalten in: Science in China - Heidelberg : Springer, 1997, 65(2022), 10 vom: 05. Sept., Seite 2018-2032 |
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| Übergeordnetes Werk: |
volume:65 ; year:2022 ; number:10 ; day:05 ; month:09 ; pages:2018-2032 |
| Links: |
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| DOI / URN: |
10.1007/s11430-021-9960-8 |
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SPR051039419 |
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| 520 | |a Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. | ||
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10.1007/s11430-021-9960-8 doi (DE-627)SPR051039419 (SPR)s11430-021-9960-8-e DE-627 ger DE-627 rakwb eng Song, Daofu verfasserin aut Petrology and geochemistry of the Carboniferous cutinite-rich coals from the Hequ area of Shanxi Province, China 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. Cutinite-rich coal (dpeaa)DE-He213 Carboniferous (dpeaa)DE-He213 Coal petrology (dpeaa)DE-He213 Geochemistry (dpeaa)DE-He213 Hequ area (dpeaa)DE-He213 Wang, Tieguan aut Li, Ping aut Yan, Jiadong aut Zheng, Xiangji aut Enthalten in Science in China Heidelberg : Springer, 1997 65(2022), 10 vom: 05. Sept., Seite 2018-2032 (DE-627)385614748 (DE-600)2142896-7 1862-2801 nnns volume:65 year:2022 number:10 day:05 month:09 pages:2018-2032 https://dx.doi.org/10.1007/s11430-021-9960-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 65 2022 10 05 09 2018-2032 |
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10.1007/s11430-021-9960-8 doi (DE-627)SPR051039419 (SPR)s11430-021-9960-8-e DE-627 ger DE-627 rakwb eng Song, Daofu verfasserin aut Petrology and geochemistry of the Carboniferous cutinite-rich coals from the Hequ area of Shanxi Province, China 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. Cutinite-rich coal (dpeaa)DE-He213 Carboniferous (dpeaa)DE-He213 Coal petrology (dpeaa)DE-He213 Geochemistry (dpeaa)DE-He213 Hequ area (dpeaa)DE-He213 Wang, Tieguan aut Li, Ping aut Yan, Jiadong aut Zheng, Xiangji aut Enthalten in Science in China Heidelberg : Springer, 1997 65(2022), 10 vom: 05. Sept., Seite 2018-2032 (DE-627)385614748 (DE-600)2142896-7 1862-2801 nnns volume:65 year:2022 number:10 day:05 month:09 pages:2018-2032 https://dx.doi.org/10.1007/s11430-021-9960-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 65 2022 10 05 09 2018-2032 |
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10.1007/s11430-021-9960-8 doi (DE-627)SPR051039419 (SPR)s11430-021-9960-8-e DE-627 ger DE-627 rakwb eng Song, Daofu verfasserin aut Petrology and geochemistry of the Carboniferous cutinite-rich coals from the Hequ area of Shanxi Province, China 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. Cutinite-rich coal (dpeaa)DE-He213 Carboniferous (dpeaa)DE-He213 Coal petrology (dpeaa)DE-He213 Geochemistry (dpeaa)DE-He213 Hequ area (dpeaa)DE-He213 Wang, Tieguan aut Li, Ping aut Yan, Jiadong aut Zheng, Xiangji aut Enthalten in Science in China Heidelberg : Springer, 1997 65(2022), 10 vom: 05. Sept., Seite 2018-2032 (DE-627)385614748 (DE-600)2142896-7 1862-2801 nnns volume:65 year:2022 number:10 day:05 month:09 pages:2018-2032 https://dx.doi.org/10.1007/s11430-021-9960-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 65 2022 10 05 09 2018-2032 |
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10.1007/s11430-021-9960-8 doi (DE-627)SPR051039419 (SPR)s11430-021-9960-8-e DE-627 ger DE-627 rakwb eng Song, Daofu verfasserin aut Petrology and geochemistry of the Carboniferous cutinite-rich coals from the Hequ area of Shanxi Province, China 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. Cutinite-rich coal (dpeaa)DE-He213 Carboniferous (dpeaa)DE-He213 Coal petrology (dpeaa)DE-He213 Geochemistry (dpeaa)DE-He213 Hequ area (dpeaa)DE-He213 Wang, Tieguan aut Li, Ping aut Yan, Jiadong aut Zheng, Xiangji aut Enthalten in Science in China Heidelberg : Springer, 1997 65(2022), 10 vom: 05. Sept., Seite 2018-2032 (DE-627)385614748 (DE-600)2142896-7 1862-2801 nnns volume:65 year:2022 number:10 day:05 month:09 pages:2018-2032 https://dx.doi.org/10.1007/s11430-021-9960-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 65 2022 10 05 09 2018-2032 |
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10.1007/s11430-021-9960-8 doi (DE-627)SPR051039419 (SPR)s11430-021-9960-8-e DE-627 ger DE-627 rakwb eng Song, Daofu verfasserin aut Petrology and geochemistry of the Carboniferous cutinite-rich coals from the Hequ area of Shanxi Province, China 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. Cutinite-rich coal (dpeaa)DE-He213 Carboniferous (dpeaa)DE-He213 Coal petrology (dpeaa)DE-He213 Geochemistry (dpeaa)DE-He213 Hequ area (dpeaa)DE-He213 Wang, Tieguan aut Li, Ping aut Yan, Jiadong aut Zheng, Xiangji aut Enthalten in Science in China Heidelberg : Springer, 1997 65(2022), 10 vom: 05. Sept., Seite 2018-2032 (DE-627)385614748 (DE-600)2142896-7 1862-2801 nnns volume:65 year:2022 number:10 day:05 month:09 pages:2018-2032 https://dx.doi.org/10.1007/s11430-021-9960-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 65 2022 10 05 09 2018-2032 |
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petrology and geochemistry of the carboniferous cutinite-rich coals from the hequ area of shanxi province, china |
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Petrology and geochemistry of the Carboniferous cutinite-rich coals from the Hequ area of Shanxi Province, China |
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Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 |
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Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 |
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Abstract Coal samples taken from the Taiyuan Formation in the Hequ area, China, for this study are typical cutinite-rich coals. The petrology and geochemistry of the samples were analyzed using microscopic examination, proximate and ultimate analysis, rock pyrolysis, and gas chromatography-mass spectrometry (GC-MS). The cutinites in Haochuan (HC) coals are predominantly of the thin-walled type, whereas those in the Jingzigou (JZG) coals are predominantly thick-walled. The variable thickness of cutinites in different coals is related to the environment in which the coal-forming plants grew. Compared with typical III kerogens, HC and JZG bituminous coals are characterized by high volatile matter yields and hydrogen contents due to the elevated hydrogen-rich cutinite content. Pyrolysis data indicate that these cutinite-rich coals can be expected to generate commercial liquid and gaseous hydrocarbons. Pristane (Pr) and phytane (Ph) are both abundant in the samples, with the Pr/Ph ratios for both the HC and JZG coals being >3.0, indicating moderate maturity and oxic peat depositional conditions. The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. Frequent marine transgression was an important contributing factor. © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022 |
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The $ C_{29} $≫$ C_{28} $>$ C_{27} $ normalized relative abundance of regular steranes is consistent with a dominant contribution from higher plants. Abundant hopanes in the coals also suggest a substantial organic matter input from bacteria, which are common inhabitants of peat and coal. Palynology studies indicate that pteridophytes are likely to be the most common coal-forming plants. A gymnosperm contribution is also indicated by the presence of tetracyclic diterpenes. Massive accumulations of cuticles as cutinite in coal are rare and account for only a small proportion of coals worldwide. However, cutinite-rich coals are found in the northern margin of the North China Craton, in the Taiyuan Formation. The accumulation of cutinite in this area is the result of distinctive peat deposition conditions. 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