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dc.contributor.authorHong, Wei-Li
dc.contributor.authorLepland, Aivo
dc.contributor.authorKirsimäe, Kalle
dc.contributor.authorCrémière, Antoine
dc.contributor.authorRae, James W.B.
dc.date.accessioned2022-02-07T13:38:42Z
dc.date.available2022-02-07T13:38:42Z
dc.date.issued2021-12-23
dc.description.abstractThe boron content and isotopic composition (δ<sup>11</sup>B), of marine carbonates have the potential to constrain CO<sub>2</sub> chemistry during carbonate growth conditions. However, obtaining and interpreting boron compositions from authigenic carbonates in geological archives present several challenges that may substantially limit their application. In particular, contamination from non-carbonate phases during sample preparation must be carefully avoided, and a variety of controls on boron composition during authigenic growth conditions must be evaluated. To advance understanding of the use and limitations of boron in authigenic carbonates, we present data and modelling results on methane-derived authigenic carbonate (MDAC), a by-product of microbially mediated anaerobic oxidation of methane, taken from three cold seep sites along the Norwegian margin. We present a novel sequential leaching method to isolate the boron signals from the micritic (Mg-calcite) and cavity-filling (aragonitic) MDAC cements in these complex multi-phase samples. This method successfully minimizes contamination from non-carbonate phases. To investigate the factors that could potentially contribute to the observed boron signals, we construct a numerical model to simulate the evolution of MDAC δ<sup>11</sup>B and B/Ca ratios over its growth history. We show that diagenetic fluid composition, depths of precipitation, the physical properties of sediments (such as porosity), and mineral surface kinetics all contribute to the observed boron compositions in the different carbonate cements. While broad constraints may be placed on fluid composition, the multiple competing controls on boron in these diagenetic settings limit the ability to place unique solutions on fluid CO<sub>2</sub> chemistry using boron in these authigenic carbonates.en_US
dc.identifier.citationHong H, Lepland A, Kirsimäe K, Crémière A, Rae JW. Boron concentrations and isotopic compositions in methane-derived authigenic carbonates: Constraints and limitations in reconstructing formation conditions. Earth and Planetary Science Letters. 2021;579:1-10en_US
dc.identifier.cristinIDFRIDAID 1975112
dc.identifier.doi10.1016/j.epsl.2021.117337
dc.identifier.issn0012-821X
dc.identifier.issn1385-013X
dc.identifier.urihttps://hdl.handle.net/10037/23944
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalEarth and Planetary Science Letters
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/PETROMAKS2/255150/Norway/Norwegian margin fluid systems and methane- derived carbonate crusts - Recent scientific advances in service of petroleum exploration/NORCRUST/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Mineralogy, petrology, geochemistry: 462en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Mineralogi, petrologi, geokjemi: 462en_US
dc.titleBoron concentrations and isotopic compositions in methane-derived authigenic carbonates: Constraints and limitations in reconstructing formation conditionsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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