H2O Content Measurement in Phengite by Secondary Ion Mass Spectrometry: A New Set of Reference Materials. Issue 4 (6th August 2019)

• Record Type: Journal Article
• Authors: Luisier, Cindy; Baumgartner, Lukas; Siron, Guillaume; Vennemann, Torsten; Robyr, Martin
• Is Part Of: Geostandards and geoanalytical research. Volume 43:Issue 4(2019)
• Page Start: 635
• Page End: 646
• Publication Date: 2019-08-06
• Subjects: H2O content -- secondary ion mass spectrometry -- ion microprobe -- white mica; Analytical geochemistry -- Periodicals; Géochimie analytique -- Périodiques; 551.9
• DOI: 10.1111/ggr.12287
• Languages: English
• ISSNs: 1639-4488

Abstract

Abstract : Five new natural white mica reference materials (RMs) were developed for in situ H2 O content analyses by secondary ion mass spectrometry at the SwissSIMS laboratory of Lausanne University, Switzerland. The white mica reference materials cover a large part of the natural muscovite–phengite compositional range and are therefore suitable as reference materials for the analysis of natural rocks as well as individual minerals. The independent H2 O content of the reference materials UNIL_WM1 to UNIL_WM5 was obtained by thermal conversion elemental analyser and corresponds to 4.35 ± 0.02, 4.33 ± 0.03, 4.30 ± 0.07, 4.50 ± 0.02 and 4.42 ± 0.11 (% m / m, ± 1 s ), respectively. SIMS determinations of H2 O content revealed a matrix effect correlated to the FeO content of white mica. The compositional range in FeO of the reference materials that were calibrated for H2 O determination is from 1.13% to 3.67% m / m . No crystallographic orientation dependency was observed at the level of homogeneity of these reference materials. An analytical precision of 0.02% to 0.08% m / m (1SE) is expected for the final uncertainty on measurements of unknown white micas in natural samples. Key Points: Five new natural white mica reference materials (RMs) were developed for in situ H2 O content analyses by secondary ion mass spectrometry. SIMS analyses of H2 O content revealed a matrix effect correlated to FeO content of white mica.