A.E. Koenig
P. Nadoll
2011
<p>Magnetite<span> (Fe</span><small><sub>3</sub></small><span>O</span><small><sub>4</sub></small><span>) is a common accessory </span>mineral<span> in many geologic settings. Its variable geochemistry makes it a powerful petrogenetic </span>indicator<span>. Electron microprobe (</span>EMPA<span>) analyses are commonly used to examine major and minor element contents in </span>magnetite<span>. </span>Laser ablation ICP-MS<span> (</span>LA-ICP-MS<span>) is applicable to trace element analyses of </span>magnetite<span> but has not been widely employed to examine compositional variations. We tested the applicability of the NIST SRM 610, the USGS GSE-1G, and the NIST SRM 2782 reference materials (RMs) as external standards and developed a reliable method for </span>LA-ICP-MS<span> analysis of </span>magnetite<span>. </span>LA-ICP-MS<span> analyses were carried out on well characterized </span>magnetite<span> samples with a 193 nm, Excimer, ArF LA system. Although </span>matrix<span>-matched RMs are sometimes important for calibration and normalization of </span>LA-ICP-MS<span> data, we demonstrate that glass RMs can produce accurate results for </span>LA-ICP-MS<span> analyses of </span>magnetite<span>. Cross-comparison between the NIST SRM 610 and USGS GSE-1G indicates good agreement for </span>magnetite<span> minor and trace element data calibrated with either of these RMs. Many elements show a sufficiently good match between the LA-ICP-MS and the EMPA data; for example, Ti and V show a close to linear relationship with correlation coefficients, </span><i>R</i><small><sup>2</sup></small><span> of 0.79 and 0.85 respectively.</span></p>
application/pdf
10.1039/c1ja10105f
en
Royal Society of Chemistry
LA-ICP-MS of magnetite: Methods and reference materials
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