摘要：AbstractFluid inclusions are records of the physico-chemical conditions of fluid–rock interactions during magmatism, mineralization and fluid percolation and mixing processes. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is a powerful tool forin situanalyses of small samples at micrometer levels. Here we reportin situanalyses of fluid inclusions using LA-ICP-MS method. NIST SRM glasses and23Na are generally used as external and internal standards for LA-ICP-MS analysis of fluid inclusion, respectively, although the RSD of microthermometric estimation of23Na is about 20% and even worse, the background signal of Na is high for most ICP-MS. Using well-characterized natural fluids inclusion, we show that RESOlution S-155 laser system analyze fluid inclusions in quartz and determine the trace element concentrations. Resonetics RESOlution S-155 laser has the advantage of the motorized Z stage can be used to accommodate variation of sample height or sample topography and height difference between samples, which is very important for analyzing the fluid inclusion in quartz. Our results suggest laser energy density is 25 J/cm2, laser pulse repetition rates are commonly between 6 and 10 Hz to avoid the fissuring of quartz and obtain adequate results. For this LA-ICP-MS analysis, uncertainty on35Cl content is around 40% because of intensity of the35Cl signal is three orders of magnitude less intense than the intensity of the23Na signal. Nevertheless, it is still a useful reference for fluid inclusion analyses in addition to23Na. This technique can be applied to a range of hydrothermal geology problems, including determining the origins of ore forming brines and ore deposition processes, mapping metamorphic and hydrothermal fluid provinces and pathways, and constraining the effects of fluid–rock reactions and fluid mixing.Highlights•The method ofin situanalyses of fluid inclusions using LA-ICP-MS is studied.•The analyses was conducted with 20–25 J/cm2optimal energy density and 6–10 Hz repetition rate.•The35Cl signal is three orders of magnitude weaker than the23Na signal so that has larger error.•Our LA-ICP-MS fluid inclusion results agree well with previous results.
