<i>In situ</i> high-precision lithium isotope analyses at low concentration levels with femtosecond-LA-MC-ICP-MS

Steinmann, Lena K.; Oeser, Martin; Horn, I.; Seitz, Hans-Michael; Weyer, Stefan

doi:10.1039/c9ja00088g

Cited by 26 publications

(34 citation statements)

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“…(d) Steinmann et al . (2019) suggested a new method for in situ measurements of lithium (Li) isotope ratios at low lithium concentration levels using UV‐femtosecond laser ablation coupled with MC‐ICP‐MS.…”

Section: Journal No Of Papersmentioning

confidence: 99%

Geostandards and Geoanalytical Research Bibliographic Review 2019

Weis

Stoll

Arns

et al. 2020

Geostandard Geoanalytic Res

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Section: Journal No Of Papersmentioning

confidence: 99%

Geostandards and Geoanalytical Research Bibliographic Review 2019

Weis

Stoll

Arns

et al. 2020

Geostandard Geoanalytic Res

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“…The laser spot size of ∼26 µm on the bracketing standard GOR132-G (Gorgona Island komatiite) allows for sufficient spatial resolution to resolve diffusion profiles. The protocol for Li isotope measurement was applied as described in detail by Steinmann et al (2019). In brief, measurements were performed at relatively cool plasma conditions (900 W) in order to avoid matrix ionization in the plasma.…”

Section: Lithium Isotope Analyses With Fs-la-mc-icp-msmentioning

confidence: 99%

“…In order to keep background Li signals low, the measurements were performed under dry plasma conditions. The sample was mixed in a homogenization device to increase signal stability (Steinmann et al, 2019). For the detection of 7 Li a 10 13 amplifier coupled to a faraday cup was deployed, while a secondary ion multiplier was used for the detection of the less abundant 6 Li.…”

Section: Lithium Isotope Analyses With Fs-la-mc-icp-msmentioning

confidence: 99%

“…Subsequently, all data were converted relative to the internationally used Li isotope standard IRMM-16 (with δ 7 Li IRMM−16 = δ 7 Li GOR132−G + 8.6; Jochum et al, 2006;Steinmann et al, 2019). Measurements of the bracketing standard GOR132-G were performed in raster ablation mode with a scan speed of 20 µm/s; the olivine profiles were measured in line ablation mode with lines arranged parallel to the crystal rim so that each line accounts for one measured δ 7 Li-value.…”

Section: Lithium Isotope Analyses With Fs-la-mc-icp-msmentioning

confidence: 99%

“…We focus on chemically zoned magmatic olivine crystals from the Massif Central continental intra-plate volcanic system, which were previously investigated for Fe-Mg inter-diffusion processes and diffusion-driven Fe-Mg isotopic zoning of olivine (Oeser et al, 2015), thus providing a framework for investigating Li in this study. Li concentrations and isotope ratios of olivine are analyzed by a newly developed matrix independent measurement method by femtosecond-laser ablation-MC-ICP-MS (Steinmann et al, 2019). By combining diffusion profiles of Fe-Mg and Li, we intend to decipher complex magma evolution scenarios, including cooling, magma mixing and degassing.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Stage Magma Evolution in Intra-Plate Volcanoes: Insights From Combined in situ Li and Mg–Fe Chemical and Isotopic Diffusion Profiles in Olivine

et al. 2020

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Understanding the timescales of magma evolution and ascent is essential for interpreting geophysical monitoring signals from active volcanoes. In this study, we explore the potential of diffusion-driven Li concentration and isotope zoning profiles recorded by magmatic olivine crystals to unravel time scales of magma evolution processes. Lithium is a fast-diffusing element and may provide the opportunity to investigate changes in magma composition during magma ascent, shortly before eruption. Lithium chemical and isotopic profiles were determined in olivines from two localities in the Massif Central volcanic region (France) that have previously been investigated for their Fe-Mg isotope systematics. The combined investigation of isotopic and chemical profiles makes it possible to distinguish between crystal growth and diffusion events. Extremely low δ 7 Livalues down to −30.7 (relative to the commonly used Li isotope standard IRMM-16) in the crystal core regions and elevated values at crystal rims (δ 7 Li ∼8 to 10 ), along with increasing concentrations from cores (∼3 to 1 µg/g) toward rims (12 to 6 µg/g) were found. The shape and orientation of both the chemical and isotopic profiles indicate that they were dominantly generated by Li diffusion into and within the olivine grains during magmatic differentiation. While Mg-Fe isotope and major element profiles have been modeled by a single diffusion event (Oeser et al., 2015), concentration and isotope profiles of Li indicate that a second diffusion event took place, that was not recorded by the Mg-Fe exchange diffusion couple. The first diffusion event was interpreted as reflecting the residence of the olivine crystals in a magma chamber. As diffusion coefficients for Fe-Mg exchange diffusion are very well determined, the time scales of this event are likely best quantified by Mg-Fe isotopic exchange diffusion modeling (Oeser et al., 2015). This event probably also generated the low δ 7 Li observed in olivine cores. Comparing the length of the Mg-Fe and Li profiles could thus be used to determine the less well-known diffusion coefficients of Li in the studied olivine crystals. The findings of this study indicate that Li diffusion at low Li concentration levels, as typically observed in natural olivine, may be not as fast as previously thought. The second diffusion event might represent a short-lived event, such as degassing, related to the ascent of the magma and/or magma cooling after emplacement of the lava. Such

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Development of in situ Li isotope analysis using laser ablation quadrupole inductively coupled plasma mass spectrometry

Fan,

Sio,

Chu

et al. 2023

Rapid Comm Mass Spectrometry

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RationaleLithium isotope geochemistry is an important tool in the studies of Earth and planetary materials. In situ Li isotope analyses are typically performed using secondary ion mass spectrometry (SIMS) or laser ablation multicollector inductively coupled plasma mass spectrometry (LA‐MC‐ICPMS), but these instruments are not widely accessible. Here, the capability of laser ablation quadrupole ICPMS for conducting Li isotopic analyses is evaluated.MethodsAn array of MPI‐DING and USGS silicate glass reference materials was analyzed repeatedly over the course of 6 months. These materials range from komatiite to rhyolite in terms of silica content (45.5–75.6 wt%) with 9–45 ppm Li. Their Li isotope compositions have been previously characterized so that matrix effects could be tested with these reference materials. Analyses were conducted using an NWR193 laser ablation system coupled to an Agilent 7900 ICPMS system.ResultsAnalytical precision is primarily limited by Li concentration in the samples. For samples with ~9 ppm Li, the internal precision is 6‰ (2 SD, 150 μm spot diameter), whereas that for a sample with ~45 ppm Li is 4‰ (2 SD, 120 μm spot diameter). The technique is somewhat sensitive to sample matrix: samples with SiO2 content that deviates from the bracketing standard display fractionated δ7Li, necessitating correction using a session‐specific matrix correction curve.ConclusionLithium isotope analysis by ns‐LA‐QICPMS is worthwhile for samples with high Li concentrations and when a matrix‐matched standard can be obtained. Although the precision of this method is not as high as those achievable with SIMS and LA‐MC‐ICPMS, it remains adequate for resolving large isotope fractionations found in natural and laboratory settings.

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In situ high-precision lithium isotope analyses at low concentration levels with femtosecond-LA-MC-ICP-MS

Abstract: Precision of a single measurement in the low signal intensity area is better with a combination of a 1013 Ω amplifier and a SEM.

Cited by 26 publications

References 53 publications

Geostandards and Geoanalytical Research Bibliographic Review 2019

Geostandards and Geoanalytical Research Bibliographic Review 2019

Multi-Stage Magma Evolution in Intra-Plate Volcanoes: Insights From Combined in situ Li and Mg–Fe Chemical and Isotopic Diffusion Profiles in Olivine

Development of in situ Li isotope analysis using laser ablation quadrupole inductively coupled plasma mass spectrometry

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