Geochemical characteristics of <Emphasis Type="Italic">n</Emphasis>-alkanes and isoprenoids in coal seams from Zhuji coal mine, Huainan coalfield, China, and their relationship with coal-forming environment 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Environmental Science and Pollution Research
年/卷/期
2018 / 25 / 10
页码
9896-9903
ISSN号
0944-1344
作者单位
CAS Key Laboratory of Crust-Mantle Materials and the Environment, School of Earth and Space Sciences, University of Science and Technology of China;CAS Key Laboratory of Crust-Mantle Materials and the Environment, School of Earth and Space Sciences, University of Science and Technology of China;CAS Key Laboratory of Crust-Mantle Materials and the Environment, School of Earth and Space Sciences, University of Science and Technology of China;
作者
Shanshan Wang;Guijian Liu;Jingjing Liu;
摘要
Ten coal seams in Upper Shihezi Formation, Lower Shihezi Formation, and Shanxi Formation from the Zhuji mine, Huainan coalfield, China, were analyzed for n -alkanes and isoprenoids (pristine and phytane) using gas chromatography-mass spectrometry (GC-MS), with an aim of reconstructing the coal-forming plants and depositional environments along with organic carbon isotope analyses. The total n -alkane concentrations ranged from 34.1 to 481 mg/kg. Values of organic carbon isotope (δ_(13)C~(org)) ranged from − 24.6 to − 23.7‰. The calorific value (Q~(b,d)), maximum vitrinite reflectance (Ro~(max)), proximate, and ultimate analysis were also determined but showed no correlation with n -alkane concentrations. Carbon Preference Index (CPI) values ranged from 0.945 to 1.30, suggesting no obvious odd/even predominance of n -alkane. The predominance of C~(11)and C~(17) n -alkanes implied that the coal may be deposited in the fresh and mildly brackish environment. According to the contrary changing trend of pristine/phytane (Pr/Ph) ratio and boron concentrations, Pr/Ph can be used as an indicator to reconstruct the marine transgression-regression in sedimentary environment of coal formation. The influence of marine transgression may lead to the enrichment of pyrite sulfur in the coal seam 4-2. C3 plants (− 32 to − 21‰) and marine algae (− 23 to − 16‰) were probably the main coal-forming plants in the studied coal seams. No correlation of the n -alkane concentration and redox condition of the depositional environment with organic carbon isotope composition were found.
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关键词/主题词
n-Alkane;Coals;Organic carbon isotope;Depositional environments;Zhuji coal mine;
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