Validation of LA-ICP-MS fluid inclusion analysis with synthetic fluid inclusions

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doi: 10.2138/am.2005.1822
Authors:Allan, Murray M.; Yardley, Bruce W. D.; Forbes, Linda J.; Shmulovich, Kirill I.; Banks, David A.; Shepherd, Thomas J.
Author Affiliations:Primary:
University of Leeds, School of Earth and Environment, Leeds, United Kingdom
Other:
Russian Academy of Sciences, Russian Federation
British Geology Survey, United Kingdom
Volume Title:American Mineralogist
Source:American Mineralogist, 90(11-12), p.1767-1775. Publisher: Mineralogical Society of America, Washington, DC, United States. ISSN: 0003-004X
Publication Date:2005
Note:In English. 34 refs.; illus., incl. 3 tables
Summary: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 LA-ICP-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.
Sections:Apparatus and techniques
Subsections:Analytical geochemistry
Subjects:Accuracy; Analysis; Calibration; Chemical analysis; Experimental studies; Fluid inclusions; Geochemistry; ICP mass spectra; Inclusions; Instruments; Laboratory studies; Laser ablation; Laser methods; Major-element analyses; Mass spectra; Microthermometry; Minor-element analyses; Spectra; Synthetic materials; Techniques
Abstract Numbers:05M/4230
Record ID:2006011186
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, copyright, Mineralogical Society of America
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