Laser ablation zircon dating

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Furthermore, the effects of spot size and plasma condition on the precision, accuracy, and uncertainty strongly depended on the sensitivity of analytes. Fine elemental and isotopic composition information of minerals at microscale are beneficial to decode the crystallization environment, the experienced geochemical process, and the history of geological body evolution. Due to the advantages of minimal sample preparation, high throughput, high spatial resolution, and small sample requirements, LA-ICP-MS has become the preferred technology for the microscale analysis in solid samples, such as mineral zonation dating and elemental and isotopic mapping [ 1 — 4 ]. Therefore, a novel method having higher analytical sensitivity, precision, and accuracy for high spatial resolution analysis using LA-ICP-MS is desired. However, such a strategy increases the consumption of sample and the chance of elemental fractionation during laser ablation. Alternatively, the addition of small amounts of a few active matrixes, such as helium [ 5 ], nitrogen [ 6 , 7 ], hydrogen [ 8 ], methane [ 9 ], ethanol [ 10 , 11 ], and water vapours [ 12 ], into traditional argon plasma has been studied for improving signal intensity, suppressing spectral interferences, and reducing matrix effect in many publications.
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Welcome to the Isotope Geology Laboratory!

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Geochemical applications of in situ isotopic analyses by laser ablation | Geochemical Society

Our laboratory has a dedicated noble gas extraction line with a SFT magnetic sector noble gas mass spectrometer and dedicated Excimer Laser. The lab also houses two Element2 magnetic sector single collector ICP-MS instruments with a second Excimer laser as well as a state-of-the-art Bruker optical interferometric microscope. The UTChron Geo- and Thermochronometry laboratory houses two Element2 magnetic sector single collector ICP-MS instruments with a large-volume cell Excimer laser system, ideally suited for depth profiling and U-Pb and trace element split stream analysis and single grain mapping. The laboratory also houses a Bruker optical interferometric microscope to control laser ablation rates as well as a Raman system.
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Isotope Chronology & Geochemistry

Gehrels , Dominique Giesler, Mark Pecha. Many applications specific to detrital mineral U-Th-Pb geochronology in the Earth sciences necessitate large numbers of age observations to be made from samples and require accurate and precise isotope measurements across wide dynamic ranges in elemental concentrations and signal intensities. This implies that the laser system and mass spectrometer cannot be tuned between individual analyses as to optimize measurements based on the isotope composition and concentrations of samples and that intensity matching between the unknowns to be dated and the reference material s used for fractionation correction is impossible to ensure.
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