The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China

Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin...
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Autor*in:	Li, Sen [verfasserIn] Zhu, Ru-Kai Cui, Jing-Wei Luo, Zhong Cui, Jing-Gang Liu, Han Li, Wei-Qiang

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2019

Schlagwörter:	Organic-rich shale Volcanic ash Framboidal pyrite pseudocrystal Chang 7 member Ordos basin

Anmerkung:	© The Author(s) 2019

Übergeordnetes Werk:	Enthalten in: Petroleum science - Beijing, 2007, 16(2019), 6 vom: 13. Nov., Seite 1255-1269
Übergeordnetes Werk:	volume:16 ; year:2019 ; number:6 ; day:13 ; month:11 ; pages:1255-1269

Links:	Volltext

DOI / URN:	10.1007/s12182-019-00386-0

Katalog-ID:	SPR025085409

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520			\|a Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter.
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allfields	10.1007/s12182-019-00386-0 doi (DE-627)SPR025085409 (SPR)s12182-019-00386-0-e DE-627 ger DE-627 rakwb eng Li, Sen verfasserin aut The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2019 Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter. Organic-rich shale (dpeaa)DE-He213 Volcanic ash (dpeaa)DE-He213 Framboidal pyrite pseudocrystal (dpeaa)DE-He213 Chang 7 member (dpeaa)DE-He213 Ordos basin (dpeaa)DE-He213 Zhu, Ru-Kai aut Cui, Jing-Wei aut Luo, Zhong aut Cui, Jing-Gang aut Liu, Han aut Li, Wei-Qiang aut Enthalten in Petroleum science Beijing, 2007 16(2019), 6 vom: 13. Nov., Seite 1255-1269 (DE-627)565518909 (DE-600)2424436-3 1995-8226 nnns volume:16 year:2019 number:6 day:13 month:11 pages:1255-1269 https://dx.doi.org/10.1007/s12182-019-00386-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_2700 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 16 2019 6 13 11 1255-1269
spelling	10.1007/s12182-019-00386-0 doi (DE-627)SPR025085409 (SPR)s12182-019-00386-0-e DE-627 ger DE-627 rakwb eng Li, Sen verfasserin aut The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2019 Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter. Organic-rich shale (dpeaa)DE-He213 Volcanic ash (dpeaa)DE-He213 Framboidal pyrite pseudocrystal (dpeaa)DE-He213 Chang 7 member (dpeaa)DE-He213 Ordos basin (dpeaa)DE-He213 Zhu, Ru-Kai aut Cui, Jing-Wei aut Luo, Zhong aut Cui, Jing-Gang aut Liu, Han aut Li, Wei-Qiang aut Enthalten in Petroleum science Beijing, 2007 16(2019), 6 vom: 13. Nov., Seite 1255-1269 (DE-627)565518909 (DE-600)2424436-3 1995-8226 nnns volume:16 year:2019 number:6 day:13 month:11 pages:1255-1269 https://dx.doi.org/10.1007/s12182-019-00386-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_2700 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 16 2019 6 13 11 1255-1269
allfields_unstemmed	10.1007/s12182-019-00386-0 doi (DE-627)SPR025085409 (SPR)s12182-019-00386-0-e DE-627 ger DE-627 rakwb eng Li, Sen verfasserin aut The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2019 Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter. Organic-rich shale (dpeaa)DE-He213 Volcanic ash (dpeaa)DE-He213 Framboidal pyrite pseudocrystal (dpeaa)DE-He213 Chang 7 member (dpeaa)DE-He213 Ordos basin (dpeaa)DE-He213 Zhu, Ru-Kai aut Cui, Jing-Wei aut Luo, Zhong aut Cui, Jing-Gang aut Liu, Han aut Li, Wei-Qiang aut Enthalten in Petroleum science Beijing, 2007 16(2019), 6 vom: 13. Nov., Seite 1255-1269 (DE-627)565518909 (DE-600)2424436-3 1995-8226 nnns volume:16 year:2019 number:6 day:13 month:11 pages:1255-1269 https://dx.doi.org/10.1007/s12182-019-00386-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_2700 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 16 2019 6 13 11 1255-1269
allfieldsGer	10.1007/s12182-019-00386-0 doi (DE-627)SPR025085409 (SPR)s12182-019-00386-0-e DE-627 ger DE-627 rakwb eng Li, Sen verfasserin aut The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2019 Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter. Organic-rich shale (dpeaa)DE-He213 Volcanic ash (dpeaa)DE-He213 Framboidal pyrite pseudocrystal (dpeaa)DE-He213 Chang 7 member (dpeaa)DE-He213 Ordos basin (dpeaa)DE-He213 Zhu, Ru-Kai aut Cui, Jing-Wei aut Luo, Zhong aut Cui, Jing-Gang aut Liu, Han aut Li, Wei-Qiang aut Enthalten in Petroleum science Beijing, 2007 16(2019), 6 vom: 13. Nov., Seite 1255-1269 (DE-627)565518909 (DE-600)2424436-3 1995-8226 nnns volume:16 year:2019 number:6 day:13 month:11 pages:1255-1269 https://dx.doi.org/10.1007/s12182-019-00386-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_2700 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 16 2019 6 13 11 1255-1269
allfieldsSound	10.1007/s12182-019-00386-0 doi (DE-627)SPR025085409 (SPR)s12182-019-00386-0-e DE-627 ger DE-627 rakwb eng Li, Sen verfasserin aut The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2019 Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter. Organic-rich shale (dpeaa)DE-He213 Volcanic ash (dpeaa)DE-He213 Framboidal pyrite pseudocrystal (dpeaa)DE-He213 Chang 7 member (dpeaa)DE-He213 Ordos basin (dpeaa)DE-He213 Zhu, Ru-Kai aut Cui, Jing-Wei aut Luo, Zhong aut Cui, Jing-Gang aut Liu, Han aut Li, Wei-Qiang aut Enthalten in Petroleum science Beijing, 2007 16(2019), 6 vom: 13. Nov., Seite 1255-1269 (DE-627)565518909 (DE-600)2424436-3 1995-8226 nnns volume:16 year:2019 number:6 day:13 month:11 pages:1255-1269 https://dx.doi.org/10.1007/s12182-019-00386-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_2700 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 16 2019 6 13 11 1255-1269
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source	Enthalten in Petroleum science 16(2019), 6 vom: 13. Nov., Seite 1255-1269 volume:16 year:2019 number:6 day:13 month:11 pages:1255-1269
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topic_facet	Organic-rich shale Volcanic ash Framboidal pyrite pseudocrystal Chang 7 member Ordos basin
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authorswithroles_txt_mv	Li, Sen @@aut@@ Zhu, Ru-Kai @@aut@@ Cui, Jing-Wei @@aut@@ Luo, Zhong @@aut@@ Cui, Jing-Gang @@aut@@ Liu, Han @@aut@@ Li, Wei-Qiang @@aut@@
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author	Li, Sen
spellingShingle	Li, Sen misc Organic-rich shale misc Volcanic ash misc Framboidal pyrite pseudocrystal misc Chang 7 member misc Ordos basin The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
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topic_title	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China Organic-rich shale (dpeaa)DE-He213 Volcanic ash (dpeaa)DE-He213 Framboidal pyrite pseudocrystal (dpeaa)DE-He213 Chang 7 member (dpeaa)DE-He213 Ordos basin (dpeaa)DE-He213
topic	misc Organic-rich shale misc Volcanic ash misc Framboidal pyrite pseudocrystal misc Chang 7 member misc Ordos basin
topic_unstemmed	misc Organic-rich shale misc Volcanic ash misc Framboidal pyrite pseudocrystal misc Chang 7 member misc Ordos basin
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title	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
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title_full	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
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author_browse	Li, Sen Zhu, Ru-Kai Cui, Jing-Wei Luo, Zhong Cui, Jing-Gang Liu, Han Li, Wei-Qiang
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title_sort	petrological characteristics and significance of organic-rich shale in the chang 7 member of the yanchang formation, south margin of the ordos basin, central china
title_auth	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
abstract	Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter. © The Author(s) 2019
abstractGer	Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter. © The Author(s) 2019
abstract_unstemmed	Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter. © The Author(s) 2019
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title_short	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
url	https://dx.doi.org/10.1007/s12182-019-00386-0
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The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. 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The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China

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