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Influencing factors and significance of organic and inorganic nitrogen isotopic compositions in lacustrine sedimentary rocks

作     者:Juan Chen Jianfa Chen Lipeng Yao Qingyong Luo Shengbao Shi Jianping Chen Lei Zhu Zeya Chen Juan Chen;Jianfa Chen;Lipeng Yao;Qingyong Luo;Shengbao Shi;Jianping Chen;Lei Zhu;Zeya Chen

作者机构:Key Laboratory of Environment Change and Resources Use in Beibu Gulf(Nanning Normal University)Ministry of EducationNanning 530001China State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Beijing 102249China Research Institute of Petroleum Exploration and DevelopmentPetroChinaBeijing 100083China 

出 版 物:《Geoscience Frontiers》 (地学前缘(英文版))

年 卷 期:2023年第14卷第2期

页      面:27-39页

核心收录:

学科分类:070903[理学-古生物学与地层学(含:古人类学)] 0709[理学-地质学] 07[理学] 

基  金:supported by the National Natural Science Foundation of China(General Program,No.41972127) the National Key Research and Development Program of China(No.2021YFA0719000) 

主  题:Nitrogen isotopes Bulk rock Kerogen Extracted organic matter Thermal maturation Nitrogen biogeochemical cycle 

摘      要:Comprehensive nitrogen biogeochemical cycle has been reconstructed for representative lacustrine organic-rich sedimentary rock in China,namely the Triassic Yanchang Formation(YF,199–230 Ma)in Ordos and the Cretaceous Qingshankou Formation(QF,86–92 Ma)in Songliao basins,by evaluating the organic and inorganic nitrogen isotopic compositions rather than only organic or bulk nitrogen isotopic *** results indicate that the nitrogen isotope values of bulk rock(δ^(15)N_(bulk))in the non-metamorphic stage are significantly different from that of kerogen,which challenge the conceptual framework of sedimentary nitrogen isotope ***δ^(15)N_(bulk)from the YF and QF were lower than their respective the nitrogen isotope values of kerogen(δ^(15)N_(ker)),with offsets up to5.1‰,which have the inverse relationship for the metamorphosed *** evolution did not significantly modify the d15N of bulk rock and *** d15N of sediments from the YF(δ^(15)N_(bulk),1.6‰–5.6‰)were lower than that of rock from the QF(δ^(15)N_(bulk),10.2‰–15.3‰).The nitrogen isotope values of silicate incorporated nitrogen(δ^(15)N_(sil))were slightly lower than those of the d15Nker in the YF and obviously lower for the *** fact that different nitrogen cycles occur in the YF and QF due to the different depositional redox conditions leads to different isotopic *** YF water environment dominated by oxic conditions is not conducive to the occurrence of denitrification and anammox,and no abundant N2 loss leads to the relatively lightδ^(15)N_(bulk).In the stratified water for the QF,redox transition zone promotes denitrification and anammox,resulting in the heavyδ^(15)N_(bulk)of rock and promotes the DNRA,resulting in heavyδ^(15)N_(ker)and lowδ^(15)N_(sil).

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