Silicon isotopes and the tracing of desilication in volcanic soil weathering sequences, Guadeloupe

Opfergelt, Sophie; Georg, R. Bastian; Delvaux, Bruno; Cabidoche, Yves-Marie; Burton, Kevin W.; Halliday, Alex N.

doi:10.1016/j.chemgeo.2012.07.032

Cited by 71 publications

(41 citation statements)

References 51 publications

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“…H2O nebulisation) were <30 mV, <2 mV and <1 mV on 28 Si, 29 Si and 30 Si, respectively. The individual contributions to the total observed background signals originate from electronic noise of the detection system, impurities in gas (He, Ar) and H 2 O-nebulisation as well as from other solid parts of the sample introduction system (e.g., tubings, torch, cones), but were not quantified separately.…”

Section: Mc-icp-msmentioning

confidence: 99%

“…Typical signal intensities for measurements were >7 V, >0.4 V, and >0.3 V on 28 Si, 29 Si and 30 Si, respectively, unless stated otherwise, and therefore background contribution to the total signal intensities were less than 0.5%. Figure 4 shows a typical fsLA-MC-ICP-MS analysis (laser raster or spot analyses), starting with background signal measurements for 1 minute (on-peak gas blank).…”

Section: Mc-icp-msmentioning

confidence: 99%

“…Based on repeat sample dissolutions and measurements, and comparison to published data on reference materials ( Table 2) analytical uncertainties of solution MC-ICP-MS data are estimated to be ± 0.11‰ (2SD) and ± 0.09‰ (2SD) on  30 Si and  29 Si, respectively. Si isotope ratios are reported in the delta notation for the 30 Si/ 28 Si ( 30 Si) and 29 Si/ 28 Si ( 29 Si) isotope ratios relative to NBS-28.…”

Section: Mass Spectrometrymentioning

confidence: 99%

“…Moveable Faraday detectors with 10 11 Ω amplifiers were precisely positioned to obtain interference-free flat-top peak shoulders for simultaneous detection of all three stable Si isotopes. Faraday cups L2, C, and H2 were used for simultaneous measurements of 28 Si, 29 Si, and 30 Si, respectively. With this cup configuration 27 Al (L4) can be detected simultaneously, which can be used for Al concentration measurements.…”

Section: Mass Spectrometrymentioning

confidence: 99%

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Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Schuessler

Blanckenburg

2014

Spectrochimica Acta Part B: Atomic Spectroscopy

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Abstract. An analytical protocol for accurate in-situ Si stable isotope analysis has been established on a new second-generation custom-built femtosecond laser ablation system. The laser was coupled to a multicollector inductively coupled plasma mass spectrometer (fsLA-MC-ICP-MS). We investigated the influence of laser parameters such as spot size, laser focussing, energy density and repetition rate, and ICP-MS operating conditions such as ICP mass load, spectral and nonspectral matrix effects, signal intensities, and data processing on precision and accuracy of Si isotope ratios. We found that stable and reproducible ICP conditions were obtained by using He as aerosol carrier gas mixed with Ar/H2O before entering the plasma. Precise  29 Si and  30 Si values (better than ±0.23‰, 2SD) can be obtained if the area ablated is at least 50 x 50 µm; or, alternatively, for the analysis of geometric features down to the width of the laser spot (about 20 µm) if an equivalent area is covered. Larger areas can be analysed by rastering the laser beam, whereas small single spot analyses reduce the attainable precision of  30 Si to ca. ±0.6 ‰, 2SD, for <30 µm diameter spots. It was found that focussing the laser beam beneath the sample surface with energy densities between 1 and 3.8 J/cm² yields optimal analytical conditions for all materials investigated here. Using pure quartz (NIST 8546 aka. NBS-28) as measurement standard for calibration (standard-sample-bracketing) did result in accurate and precise data of international reference materials and samples covering a wide range in chemical compositions (Si single crystal IRMM-017, basaltic glasses KL2-G, BHVO-2G and BHVO-2, andesitic glass ML3B-G, rhyolitic glass ATHO-G, diopside glass JER, soda-lime glasses NIST SRM 612 and 610, San Carlos olivine). No composition-dependent matrix effect was discernible within uncertainties of the method. The method was applied to investigate the Si isotope signature of rock weathering at the micro-scale in a corestone sampled from a highly weathered roadcut profile in the tropical Highlands of Sri Lanka. The results show that secondary weathering products accumulated in cracks and grain boundaries are isotopically lighter than their unweathered plagioclase host, consistent with isotopically heavy dissolved Si found in rivers.

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Section: Mc-icp-msmentioning

confidence: 99%

Section: Mc-icp-msmentioning

confidence: 99%

Section: Mass Spectrometrymentioning

confidence: 99%

Section: Mass Spectrometrymentioning

confidence: 99%

See 2 more Smart Citations

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Schuessler

Blanckenburg

2014

Spectrochimica Acta Part B: Atomic Spectroscopy

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show abstract

“…Silicon has three stable isotopes: 28 Si, 29 Si, and 30 Si with relative abundances of 92.23 %, 4.67 %, and 3.1 % respectively (Cardinal et al 2003;Georg et al 2007). Researchers have conducted numerous studies on Si isotopes to better understand magmatism, meteorites, hydrothermal mineral deposits, clay minerals, the ocean silicon cycle, biological silicate, and fractionation of silicate melts and metallic melts (Brzezinski et al 2003;Armytage et al 2011;Opfergelt et al 2011;Armytage et al 2012;Opfergelt et al 2013;Hin et al 2014;Zhu et al 2014). Studies on silicon isotopes have not only revealed Earth's evolutionary history Armytage et al 2011;Ziegler et al 2010;Savage and Moynier 2013;) but also are very important in explaining ore genesis (as it pertains to mineral resources) and in research on the climate and carbon cycle (Dugdale et al 2004;Pringle et al 2013;Hou et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Standard-sample bracketing calibration method combined with Mg as an internal standard for silicon isotopic compositions using multi-collector inductively coupled plasma mass spectrometry

et al. 2016

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Silicon isotope analysis traditionally uses a standard-sample bracketing (SSB) method that relies upon greater instrument stability than can be consistently expected. The following proposed method reduces the level of instrumental stability required for the analysis process and provides a valid solution for high-precision and accurate studies of Si isotopic compositions. Rock samples were dissolved by using alkali fusion and acidification. Silicon isotopes were purified with an ion exchange resin. Interfering peaks for isotopes were separated by using a Nu Plasma 1700 multi-collector inductively coupled plasma mass spectrometry (MS) system in high-resolution mode (M/DM [ 8000 RP). Two magnesium isotopes ( 25 Mg and 26 Mg) and three silicon isotopes ( 28 Si, 29 Si, and 30 Si) were analyzed in the same data collection cycle. Mg isotopes were used as an internal standard to calibrate the mass discrimination effects in MS analysis of Si isotopes in combination with the SSB method in order to reduce the effects of MS interference and instrumental mass discrimination on the accuracy of measurements. The conventional SSB method without the Mg internal standard and the proposed SSB method with Mg calibration delivered consistent results within two standard deviations. When Mg was used as an internal standard for calibration, the analysis precision was better than 0.05 % amu.

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Silicon isotope composition of subduction zone fluids as recorded by jadeitites from Myanmar

Chen

et al. 2019

Contrib Mineral Petrol

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Silicon isotopes and the tracing of desilication in volcanic soil weathering sequences, Guadeloupe

Cited by 71 publications

References 51 publications

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Standard-sample bracketing calibration method combined with Mg as an internal standard for silicon isotopic compositions using multi-collector inductively coupled plasma mass spectrometry

Silicon isotope composition of subduction zone fluids as recorded by jadeitites from Myanmar

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