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Microanalysis of S, Cl, and Br in fluid inclusions by LA-ICP-MS

Citation

Seo, JH and Guillong, M and Aerts, M and Zajacz, Z and Heinrich, CA, Microanalysis of S, Cl, and Br in fluid inclusions by LA-ICP-MS, Chemical Geology: An International Journal, 284, (1-2) pp. 35-44. ISSN 0009-2541 (2011) [Refereed Article]


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DOI: doi:10.1016/j.chemgeo.2011.02.003

Abstract

The accuracy and precision of micro-analysis of sulfur (S), chlorine (Cl) and bromine (Br) in quartz-hosted fluid inclusions by laser ablation (LA) inductively coupled plasma mass spectrometry (ICP-MS) were tested. A scapolite mineral sample (Sca17) can be used as standard reference material (SRM) for the determination of Cl and Br, and NIST610 glass for S determination in fluid inclusions. We found that laser ablation of quartz and UV irradiation in the ablation cell produced elevated background signals of S and to a lesser amount of Cl and Br due to remobilization of these elements from the inside surfaces of the ablation chamber. Careful cleaning of the ablation chamber with nitric acid and by UV irradiation results in a 10 times lower S contamination signal and improves fluid inclusion analysis by reducing the detection limit for S by 50%. Micro-analysis of liquid and vapor inclusions synthesized in two different laboratories produce good accuracies of S, Cl, and Br. Analytical uncertainties based on numerous analyses of individual synthetic fluid inclusions in one assemblage are 17–44% (RSD) for the sulfur concentration, and 6–26% for Br/Cl ratios. Limits of detection (LOD) in 30 μm diameter liquid inclusions with densities of 0.99–1.02 g/cm3 are in the range of 60 μg/g for S, 250 μg/g for Cl, and 15 μg/g for Br. LOD's in similar sized vapor inclusions with a density of 0.33 g/cm3 are at least an order of magnitude poorer. Based on the investigated natural brine inclusion assemblages, the precisions of Br/Cl ratios (4–9% RSD) are adequate to determine the source of salinity in different ore-forming fluids.

Item Details

Item Type:Refereed Article
Keywords:LA–ICP-MS, fluid inclusion, sulfur, chlorine, bromine, halogen
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Inorganic Geochemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Guillong, M (Dr Marcel Guillong)
ID Code:74870
Year Published:2011
Web of Science® Times Cited:53
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2011-12-14
Last Modified:2012-12-17
Downloads:0

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