Pb isotopic zoning of K-feldspar megacrysts determined by Laser Ablation Multi-Collector ICP-MS: Insights into granite petrogenesis

Lead isotopes by LA-MC-ICPMS: Tracking the emergence of mantle signatures in an evolving silicic magma system

“…For many geologic materials the utility of our technique is limited to determining Pb isotope ratios comprised of the 206 Pb, 207 Pb, and 208 Pb nuclides because of insufficient 204 Pb ion yields. Our sample-standard comparison results are considerably better than LA-MC-ICPMS results obtained using Tl as a means for correcting for instrumental mass fractionation (Willigers et al, 2002;Mathez and Waight, 2003;Gagnevin et al, 2005) …”

“…Willigers et al, 2002;Mathez and Waight, 2003;Gagnevin et al, 2005). The measured Pb isotope ratios of the standards and rhyolitic materials were compared to those of a NBS981 standard solution.…”

“…The variability of NBS612 represents our best estimate of our external reproducibility (Table 1) because it has a Pb abundance that is similar to the rhyolite materials (cf. Gagnevin et al, 2005). Reproducibly over longer time periods is less well-documented because the sample measurements were made fairly rapidly ($month) and the LA-MC-ICPMS facility at UCLA is primarily used for measurement of lighter isotope systems.…”

Microanalysis of Pb isotope ratios of low-Pb glass samples by femtosecond laser ablation-multiple ion counter-ICP-mass spectrometry (fsLA-MIC-ICP-MS)

“…In situ analysis of Pb isotopes by laser ablation coupled with multiple-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) has been applied to a wide variety of geological samples, including silicate minerals, glasses and melt inclusions (Mathez and Waight, 2003;Peate et al, 2003;Gagnevin et al, 2005;Kent and Dilles, 2005;Paul et al, 2005;Simon et al, 2007;Kent, 2008a, b;Paul et al, 2011;Westgate et al, 2011;Kimura et al, 2013). For Pb-rich material and/or when a large ablation spot is possible, LA-MC-ICP-MS using Faraday collectors can provide in situ Pb isotope analysis with accuracy of several per mil, even for the minor 204 Pb (cf., Kimura et al, 2013).…”

Pb isotopes in drinking water: A new strategy for source detection of low Pb sources

“…Advances in sample preparations and alloy filaments enable high ion beam stability and intensity (de Groot 2004) thus delivering isotope measurements on very small sample sizes of 15-300 ng. Future advances in laser ablation techniques should permit minute sample preparations among a variety of matrix Pb sources (Gagnevin et al 2005).…”