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dc.contributor.authorLiu, Yang
dc.contributor.authorStüeken, Eva E.
dc.contributor.authorWang, Dongsheng
dc.contributor.authorTang, Xuan
dc.contributor.authorNie, Haikuan
dc.contributor.authorDang, Wei
dc.contributor.authorZhang, Jinchuan
dc.identifier.citationLiu , Y , Stüeken , E E , Wang , D , Tang , X , Nie , H , Dang , W & Zhang , J 2022 , ' A potential linkage between excess silicate-bound nitrogen and N 2 -rich natural gas in sedimentary reservoirs ' , Chemical Geology , vol. 600 , 120864 .
dc.identifier.otherRIS: urn:1B71456350DEBCF116F9D9553D36A234
dc.identifier.otherORCID: /0000-0001-6861-2490/work/112333991
dc.descriptionFunding: This work was supported by the National Natural Science Foundation of China (42102171, 41927801, 41972132), the Fundamental Research Funds for the Central Universities (2652019098), and the China Scholarship Council (202006405019). EES acknowledges funding from a NERC grant (NE/V010824/1).en
dc.description.abstractMolecular nitrogen (N2) released from sedimentary rocks during metamorphism is an important component of the biogeochemical nitrogen cycles. However, the importance and variability of this metamorphic N2 flux from rock nitrogen to Earth's surface environment remains largely unexplored. Here we present a comprehensive bulk rock C-N and N2 concentration dataset from the lower Cambrian shale across the Yangtze Block. The results reveal a spatial trend of excess silicate-bound nitrogen in the lower Cambrian shale throughout the Yangtze Block, which is interpreted as partial assimilation of ammonium (NH4+) with high concentrations of NH4+ accumulating in the euxinic water column and in sediment pore waters at shelf and slope environments during sedimentation. The remarkable spatial coupling between silicate-bound nitrogen in bulk rock shale and N2 concentration in modern shale reservoirs indicates that the high proportion of silicate-bound nitrogen may act as an important control on the formation of N2-rich gas in shale reservoirs during metamorphism. These N2-rich reservoir rocks may have affected the surface environment through tectonic movement over Earth's history. Our results therefore identify a novel linkage in the nitrogen cycle and provide evidence for the importance of metamorphism on the return of rock nitrogen back to the surface environment. We further reveal that the metamorphic N2 gas flux from the geosphere to the atmosphere is dependent on environmental conditions during sediment deposition.
dc.relation.ispartofChemical Geologyen
dc.subjectNitrogen cyclingen
dc.subjectN-rich natural gasen
dc.subjectSilicate-bound nitrogenen
dc.subjectEarly Cambrianen
dc.subjectYangtze Blocken
dc.subjectQE Geologyen
dc.titleA potential linkage between excess silicate-bound nitrogen and N2-rich natural gas in sedimentary reservoirsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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