Validation of LA-ICP-MS fluid inclusion analysis with synthetic fluid inclusions
-
Murray M. Allan
,
Bruce W. D. Yardley
Abstract
Laser ablation.inductively coupled plasma.mass spectrometry (LA-ICP-MS) has become recognized as a sensitive, efficient, and cost-effective approach to measuring the major-, minor-, and trace-solute compositions of individual fluid inclusions in minerals. As a prerequisite for the routine analysis of natural inclusions in our laboratory, the precision and accuracy of the technique was assessed using sets of multi-element synthetic fluid inclusions. Five multi-element standard solutions were prepared, and incorporated as fluid inclusions in quartz crystals at 750 °C and 7 kbar. Fluid inclusions were ablated with a 193 nm ArF excimer laser and analyzed with a quadrupole ICP-MS, equipped with an octopole reaction cell for the removal of Ar-based interferences. The internal standard used in all cases was Na. Analytical precision for K, Rb, and Cs is typically better than 15% RSD, whereas Li, Mg, Ca, Sr, Ba, Mn, Fe, Cu, Zn, and Cl analyses are typically reproducible within 30% RSD. Measured concentrations approximate a Gaussian distribution, suggesting that analytical errors are random. Analyses for most elements are accurate within 15%. Limits of detection vary widely according to inclusion volume, but are 1 to 100 µg/g for most elements. These figures of merit are in excellent agreement with previous studies. We also demonstrate that, over the range investigated, precision and accuracy are insensitive to inclusion size and depth. Finally, the combination of our LAICP- MS analyses with microthermometric data shows that charge-balancing to NaCl-H2O equivalent chloride molality is the most valid approach to LA-ICP-MS data reduction, where chloride-dominated fluid inclusions are concerned.
© 2015 by Walter de Gruyter Berlin/Boston
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- Electronic article. Getting the inside story: using computed X-ray tomography to study inclusion trails in garnet porphyroblasts
- Structure of framboidal pyrite: An electron backscatter diffraction study
- The mineralogical microstructure of shells: PART 2.1 The iridescence colors of abalone shells
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- Experimental study on diamond dissolution in kimberlitic and lamproitic melts at 1300-1420 °C and 1 GPa with controlled oxygen partial pressure
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- Crystal chemistry of the elbaite-schorl series
- Morphology of nanomagnetite crystals: Implications for formation conditions
- Fragmentation phenomena in populations of magmatic crystals
- Kinetics of Fe2+-Mg order-disorder in P21/c pigeonite
- First-principles studies on the elastic constants of a 1:1 layered kaolinite mineral
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- Letter. Direct observations of pseudomorphism: compositional and textural evolution at a fluid- solid interface
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- Comment on Melluso et al. (2003) Reported data and interpretation of some wollastonite- and melilite-bearing rocks from the Central Apennines of Italy
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- Comment on Melluso et.al. (2003). The Ricetto and Colle Fabbri wollastonite and melilite-bearing rocks of the central Apennines, Italy
- Reply to Capitanio 2005. Mineralogic and bulk rock composition of Italian wollastonite- and melilite-bearing paralava and clinker: Further evidence of their pyrometamorphic nature
