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Abstract
We present a new analytical method, which allows the simultaneous analysis of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) in geological samples. To account for interferences of Fe on the spectral lines of F, of Al on Br-lines, and of Ca on I-lines, we prepared four new halogen-free calibration glasses. The new method is used to analyze various glass reference materials and crystal-hosted melt inclusions from the Azores. Our results show that our new method allows reliable and reproducible analyses of all four halogens in silicate glasses.
Highlights
The halogens, fluorine (F), chlorine (Cl), bromine (Br) and iodine (I), exert an important role in many magmatic and hydrothermal processes (Harlov & Aranovich, 2018)
We present a new analytical method, which allows the simultaneous analysis of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) in geological samples
Halogens can be analyzed in geological samples using various analytical techniques, including secondary ion mass spectrometry (SIMS) (e.g., Hinton, 1990; Straub & Layne, 2003; Kusebauch et al, 2015; Cadoux et al, 2017), noble gas mass spectrometry (e.g., Kendrick et al, 2012), instrumental neutron activation (INAA)
Summary
The halogens, fluorine (F), chlorine (Cl), bromine (Br) and iodine (I), exert an important role in many magmatic and hydrothermal processes (Harlov & Aranovich, 2018). These DLs, especially for Br and I, are too high for obtaining reasonable analyses in natural samples (in some case, Br concentrations can reach up to 300 μg/g in melt inclusions and matrix glasses; Bureau & Métrich, 2003) They can be useful in experimental petrology in order to determine partition coefficients for these elements, especially I, in magmatic and/or hydrothermal systems, evaluating the behavior of these elements in such systems. Fluorine and Br analyses of silicate glasses were conducted using the analytical protocols of Zhang et al (2016, 2017), and I using our own new analytical protocol These new reference materials and improved EPMA methods can be applied to geological investigations that require high spatial resolution, e.g., experimental studies (e.g., Steenstra et al, 2020), or the study of melt inclusions (e.g., Métrich et al, 2014; Rose-Koga et al, 2017; present study)
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