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Organic geochemistry of a lacustrine shale across the Toarcian Oceanic Anoxic Event (Early Jurassic) from NE China

文献类型：期刊论文

作者Liu, Mu1,3,6; Sun, Peng2; Them, Theodore R., II4; Li, Yongfei5; Sun, Shouliang5; Gao, Xiaoyong5; Huang, Xin5; Tang, Youjun2
刊名GLOBAL AND PLANETARY CHANGE
出版日期2020-08-01
卷号191页码:13
ISSN号0921-8181
关键词Organic geochemistry Biomarker Beipiao Toarcian Lacustrine
DOI10.1016/j.gloplacha.2020.103214
英文摘要Thirty-nine shale samples of the Lower Jurassic Beipiao Formation from drill core ZK01 in the Jinyang Basin, NE China were investigated by comprehensive organic geochemical methods in this study. A prominent negative excursion in delta C-13(org) values (similar to 2 parts per thousand) was observed in the Beipiao Formation, which is most likely associated with Toarcian Oceanic Anoxic Event (T-OAE) negative carbon isotope excursion (CIE) that is recorded globally in marine and terrestrial sediments constrained by previous studies. Elemental and Rock-Eval analyses of Beipiao shales demonstrate that the total organic carbon (TOC) ranges from 0.56 to 4.33 wt% (average of 1.40 wt%) and S-2 values range from 0.12 to 6.91 mg/g (average of 1.3 mg/g) and implicate fair to good source rock potential. A majority of the T-max values of the Beipiao shales range from 456 to 465 degrees C, indicating that the organic matter is within the mature oil window apart from few overmature samples with extreme high T-max values that might have been affected by local magmatic intrusions. Elemental analysis suggests that the kerogens are mainly Type II-III. Unlike many marine organic-rich sediments deposited during OAEs, redox proxies indicate no significant upper water column oxygen-depletion during the formation of Beipiao lacustrine shale. The decreasing upward trend of organic source indicators such as tricyclic terpanes/C-30 hopane values, relative distributions of regular C-27 steranes to C-29 steranes, and steranes/hopanes in the Beipiao Formation consistently suggest a shift to a lower abundance of eukaryotic organisms relative to bacterial community abundance during the onset of the T-OAE. Meanwhile, gradually decreasing values of gammacerane/C-30 hopane in the Beipiao Formation during the negative CIE suggest decreasing salinity and increased mixing of the Jinyang paleo-lake system, potentially corresponding with the shift toward an accelerated hydrological cycle with enhanced fresh water input to this lacustrine system. Moreover, increasing C-30 moretane/C-30 hopane values contemporaneous with the negative CIE also suggest enhanced land erosion during putative Toarcian climatic warming, which could have increased delivery of riverine nutrients and elevated regional primary productivity, eventually resulting in massive organic matter accumulation in the Beipiao shales.
WOS关键词DEPOSITIONAL ENVIRONMENT ; ISOTOPE EVIDENCE ; CARBON-CYCLE ; SOURCE ROCKS ; BASIN ; MARINE ; PERTURBATION ; SEDIMENTARY ; VEGETATION ; MATURITY
资助项目China Geological Survey[DD20160167] ; National Natural Science Foundation of China[41790451] ; National Natural Science Foundation of China[41972148] ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education[K-2018-23]
WOS研究方向Physical Geography ; Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000540178200010
资助机构China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education ; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education
源URL[http://ir.iggcas.ac.cn/handle/132A11/96887]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Tang, Youjun
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Yangtze Univ, Key Lab Explorat Technol Oil & Gas Resources, Minist Educ, Wuhan 430100, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
4.Coll Charleston, Dept Geol & Environm Geosci, Charleston, SC 29424 USA
5.China Geol Survey, Shenyang Ctr Geol Survey, Shenyang 110034, Peoples R China
6.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Mu,Sun, Peng,Them, Theodore R., II,et al. Organic geochemistry of a lacustrine shale across the Toarcian Oceanic Anoxic Event (Early Jurassic) from NE China[J]. GLOBAL AND PLANETARY CHANGE,2020,191:13.
APA Liu, Mu.,Sun, Peng.,Them, Theodore R., II.,Li, Yongfei.,Sun, Shouliang.,...&Tang, Youjun.(2020).Organic geochemistry of a lacustrine shale across the Toarcian Oceanic Anoxic Event (Early Jurassic) from NE China.GLOBAL AND PLANETARY CHANGE,191,13.
MLA Liu, Mu,et al."Organic geochemistry of a lacustrine shale across the Toarcian Oceanic Anoxic Event (Early Jurassic) from NE China".GLOBAL AND PLANETARY CHANGE 191(2020):13.

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来源：地质与地球物理研究所

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