In situ decarboxylation of acetic and formic acids in aqueous inclusions as a possible way to produce excess CH4

Accurate reconstruction of diagenetic P‐T conditions in petroleum reservoirs from fluid inclusion data relies on valid measurements of methane concentration in aqueous inclusions. Techniques have been developed (Raman spectrometry) to provide sufficiently accurate data, assuming measured methane concentration has not been modified after aqueous inclusion entrapment. This study investigates the likelihood that organic acids derived from petroleum fluids and dissolved in formation water might suffer decarboxylation upon postentrapment heating within the fluid inclusion chamber, thereby generating excess CH₄ in the inclusions. Four different experiments were conducted in fused silica capillary capsules (FSCCs), mimicking fluid inclusions. The capsules were loaded with acetic (CH₃COOH) or formic (HCOOH) acid solution and were heated to 250°C for short durations (<72 h) in closed‐system conditions, with or without applying a fixed P_H2. Reaction products were characterized by Raman and FT‐IR spectrometry. Results indicate that decarboxylation reactions did take place, at variable degrees of progress, and that measurable excess CH₄ was produced in one experiment using acetic acid. This suggests that methane may be produced from dissolved organic acids in natural aqueous inclusions in specific situations, possibly inducing errors in the thermodynamic interpretation.     

Russia and Norway: Research Collaboration and Comparison of Asymmetrical Relations

Archaeological excavations in 1954, 1958, and 1962 directed by Dr. C.L. Vebaek of The Danish National Museum at the Norse site 0 17a in the modern Greenlandic town of Narssaq revealed a farmstead apparently occupied from the 11th century into the later phases of the Eastern Settlement. The excavations recovered a quantifiable amount of animal bone from well‐defined strata within and immediately around the main structure. These collections were analysed in 1976–77 by the authors and show both continuity and some important changes in subsistence patterns between occupational strata.     

Pre‐Modern Boathouses: a maritime perspective from northern Norway

Most Scandinavian boathouses predating the Reformation (AD 1537) are located in Norway, starting in the Early Iron Age, and a majority are found in the north. Following a critical review of Norwegian boathouse studies from a historical and regional perspective, current research themes in northern Norway are discussed. Boathouses are viewed as multifunctional entities providing insights into the marine economy, social organization, and ethnic interaction between Sami and Norse populations. A more balanced and holistic perspective is needed in which boathouses are seen as a central component of the maritime cultural landscape with uses extending substantially beyond boat storage. © 2012 The Authors     

‘That's not a good idea,mom': Negotiating children's subjectivity while constructing ‘home’ as a research site

Framing this methodological article are two main themes on which we elaborate: (1) constructing ‘home’ as a site for doing research with children, and (2) facilitating children's autonomy and subjectivity in the accessing and recruiting phases, thus providing them opportunities to buy into the research process. Drawing on joint experiences from two closely related research projects on a housing development in Norway, we bring to the fore and explore both the role of gatekeepers and sponsors and ongoing negotiations within the triangular parent–child–researcher relation.