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Boron concentrations and isotopic compositions in methane-derived authigenic carbonates: Constraints and limitations in reconstructing formation conditions
Stockholm University, Faculty of Science, Department of Geological Sciences. Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre. Geological Survey of Norway (NGU), Norway; the Arctic University of Tromsø, Norway.ORCID iD: 0000-0002-7247-1827
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Number of Authors: 52022 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 579, article id 117337Article in journal (Refereed) Published
Abstract [en]

The boron content and isotopic composition (δ11B), of marine carbonates have the potential to constrain CO2 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 δ11B 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 CO2 chemistry using boron in these authigenic carbonates.

Place, publisher, year, edition, pages
2022. Vol. 579, article id 117337
Keywords [en]
boron, methane-derived authigenic carbonate, transport-reaction modelling, early diagenesis
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-205178DOI: 10.1016/j.epsl.2021.117337ISI: 000782106500011OAI: oai:DiVA.org:su-205178DiVA, id: diva2:1662287
Available from: 2022-05-31 Created: 2022-05-31 Last updated: 2022-05-31Bibliographically approved

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Hong, Wei-Li

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