Paleoenvironmental conditions of organic-rich Upper Permian Dalong Formation shale in the Sichuan Basin, southwestern China

doi:10.1016/j.marpetgeo.2017.12.003

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	Paleoenvironmental conditions of organic-rich Upper Permian Dalong Formation shale in the Sichuan Basin, southwestern China
	Wei, Zhifu 1; Wang, Yongli 1,2; Wang, Gen 1; Sun, Zepeng 1,3; Zhang, Ting 1,3; Xu, Liang 1,3; Ma, Xueyun 1,3; He, Wei 1,3
刊名	MARINE AND PETROLEUM GEOLOGY
	2018-03-01
卷号	91 页码:152-162
关键词	Dalong Formation Organic-rich Shales Biomarkers Carbon Isotopes Trace Elements Paleoenvironment
ISSN号	0264-8172
DOI	10.1016/j.marpetgeo.2017.12.003
文献子类	Article
英文摘要	Organic geochemical and trace element analysis of a suite of 33 samples collected from the Shangsi section of the Upper Permian Dalong Formation, located near Guangyuan in the northwestern Sichuan Basin, have been used to better understand the marine depositional environment of its shale lithofacies. A 15 m-thick black shale interval near the middle of the formation is enriched in total organic carbon (TOC = 1.1-14.4%, mean = 6.4%). The n-alkane, terpane and sterane biomarker distributions of the shale suggest that its organic matter is of predominantly marine algal origin. Pr/Ph, Pr/n-C-17, Ph/n-C-18 and gammacerane/C-30 hopane ratios demonstrate that reducing conditions prevailed during its deposition. This interpretation is supported by the redox-sensitive abundance of Mo and the trace element redox ratios Ni/Co, V/Cr, U/Th and V/(V + Ni), all of which indicate deposition in a euxinic/anoxic setting. The Mo-TOC relationship in the Dalong shales plots mid-way between those of sediments in the present-day Saanich Inlet and Cariaco Basin, suggesting a moderately restricted depocentre. However, the delta C-13(org) values of these shales reveal that their organic matter is isotopically much lighter than that found in modern euxinic sediments, implying extremely anoxic bottom waters and a slow-down of oceanic circulation during the Late Permian.
WOS关键词	EDIACARAN-CAMBRIAN TRANSITION ; PETROLEUM SOURCE ROCKS ; SOUTH CHINA ; YANGTZE PLATFORM ; BLACK SHALES ; GEOCHEMICAL CHARACTERISTICS ; DEPOSITIONAL ENVIRONMENT ; NORTHWESTERN HUNAN ; MERCURY INTRUSION ; MASS EXTINCTION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000430886900010
资助机构	National key R&D Program of China(2017YFA0604803) ; National key R&D Program of China(2017YFA0604803) ; National Natural Science Foundation of China(41572350 ; National Natural Science Foundation of China(41572350 ; Chinese Academy of Sciences Key Project(XDB10030404) ; Chinese Academy of Sciences Key Project(XDB10030404) ; Western Light Project ; Western Light Project ; Key Laboratory Project of Gansu(1309RTSA0410) ; Key Laboratory Project of Gansu(1309RTSA0410) ; 41503049) ; 41503049) ; National key R&D Program of China(2017YFA0604803) ; National key R&D Program of China(2017YFA0604803) ; National Natural Science Foundation of China(41572350 ; National Natural Science Foundation of China(41572350 ; Chinese Academy of Sciences Key Project(XDB10030404) ; Chinese Academy of Sciences Key Project(XDB10030404) ; Western Light Project ; Western Light Project ; Key Laboratory Project of Gansu(1309RTSA0410) ; Key Laboratory Project of Gansu(1309RTSA0410) ; 41503049) ; 41503049) ; National key R&D Program of China(2017YFA0604803) ; National key R&D Program of China(2017YFA0604803) ; National Natural Science Foundation of China(41572350 ; National Natural Science Foundation of China(41572350 ; Chinese Academy of Sciences Key Project(XDB10030404) ; Chinese Academy of Sciences Key Project(XDB10030404) ; Western Light Project ; Western Light Project ; Key Laboratory Project of Gansu(1309RTSA0410) ; Key Laboratory Project of Gansu(1309RTSA0410) ; 41503049) ; 41503049) ; National key R&D Program of China(2017YFA0604803) ; National key R&D Program of China(2017YFA0604803) ; National Natural Science Foundation of China(41572350 ; National Natural Science Foundation of China(41572350 ; Chinese Academy of Sciences Key Project(XDB10030404) ; Chinese Academy of Sciences Key Project(XDB10030404) ; Western Light Project ; Western Light Project ; Key Laboratory Project of Gansu(1309RTSA0410) ; Key Laboratory Project of Gansu(1309RTSA0410) ; 41503049) ; 41503049)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88269]
专题	地质与地球物理研究所_兰州油气中心
通讯作者	Wang, Yongli; Wang, Gen
作者单位	1.Chinese Acad Sci, Key Lab Petr Resources, Gansu Province Key Lab Petr Resources Res, Inst Geol & Geophys, Lanzhou 730000, Gansu, Peoples R China 2.Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wei, Zhifu,Wang, Yongli,Wang, Gen,et al. Paleoenvironmental conditions of organic-rich Upper Permian Dalong Formation shale in the Sichuan Basin, southwestern China[J]. MARINE AND PETROLEUM GEOLOGY,2018,91:152-162.
APA	Wei, Zhifu.,Wang, Yongli.,Wang, Gen.,Sun, Zepeng.,Zhang, Ting.,...&He, Wei.(2018).Paleoenvironmental conditions of organic-rich Upper Permian Dalong Formation shale in the Sichuan Basin, southwestern China.MARINE AND PETROLEUM GEOLOGY,91,152-162.
MLA	Wei, Zhifu,et al."Paleoenvironmental conditions of organic-rich Upper Permian Dalong Formation shale in the Sichuan Basin, southwestern China".MARINE AND PETROLEUM GEOLOGY 91(2018):152-162.