The application of carbon isotope compositions of fluorene and its methylated homologues in the sources and depositional environments of sedimentary organic matterOA
Analysis of the carbon isotope composition(δ^(13)C)of individual polycyclic aromatic compounds(PACs)in sedimentary organic matter(OM)and oils is increasingly important in organic geochemistry,as it provides information on OM sources,thermal maturity,and secondary alteration.In this study,theδ^(13)C values of fluorene(Flu)and its methylated homologues were investigated in coal extracts and crude oils from various depositional environments(lacustrine shale,marine shale,marine carbonate,and terrestrial coal).The results show that theδ^(13)C values of Flu and 1-methylfluorene(1-MF)are primarily affected by the origin of OM and are less related to thermal maturity,which indicates a variety of depositional environments.Two crossplots of theδ^(13)C values for Flu and 1-MF versus the pristane/phytane ratio(Pr/Ph)are used to investigate the effects of the depositional environments and sources of OM.These cross-plots classify the study samples into five environmental/source zones:marine,algae;lacustrine,algae-bacterial mixed;deltaic/lacustrine/coastal,mixed and aquatic-dominated;transitional(marine and terrestrial),mixed and terrigenous-dominated;and coal,terrigenous.The samples from the various depositional environments and sources are distinguishable,particularly those of marine and transitional facies with similar paleoenvironments.The results provide useful tools to discriminate between OM derived from different sources with different levels of marine and terrestrial input.
Ziao Geng;Meijun Li;Shuichang Zhang;Shengbao Shi;Lei Zhu;Tiantian Li;Jianfeng Zhang
Hainan Institute of China University of Petroleum(Beijing),Sanya 572025,Hainan,China National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,ChinaHainan Institute of China University of Petroleum(Beijing),Sanya 572025,Hainan,China National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,China Faculty of Petroleum,China University of Petroleum-Beijing at Karamay,Karamay 834000,ChinaResearch Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,ChinaHainan Institute of China University of Petroleum(Beijing),Sanya 572025,Hainan,China National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,ChinaHainan Institute of China University of Petroleum(Beijing),Sanya 572025,Hainan,China National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,ChinaHainan Institute of China University of Petroleum(Beijing),Sanya 572025,Hainan,China National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,ChinaHainan Institute of China University of Petroleum(Beijing),Sanya 572025,Hainan,China National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,China
天文与地球科学
δ^(13)C valuesIndividual aromatic compoundsFluorene1-MethylfluoreneDepositional environmentSource
《Acta Geochimica》 2026 (2)
P.342-356,15
funded by the National Natural Science Foundation of China(Grant No.42202134)。
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