研究目的
To present a quasi-simultaneous U-Pb and Sm-Nd systematic measurement in common natural LREE-enriched minerals by using a MC-ICP-MS connected to a 193nm excimer laser in a single shot.
研究成果
The methodology of sequential analysis of U-Pb age and Sm-Nd isotope in natural LREE-enriched minerals by a means of one MC-ICP-MS connected to a 193nm excimer laser in a single shot is feasible and capable. This technique is of value in applications requiring U-Pb age and Sm-Nd isotope ratios from a single laser carter.
研究不足
The main limitation of sequential analysis is the signal strength with slightly larger laser beam size. Only the minerals with high concentrations of Nd and appropriate U and Pb concentration can be used for the sequential analysis of U-Pb age and Sm-Nd isotopic ratios with reasonable analytical precision.
1：Experimental Design and Method Selection
The study uses a Neptune Plus MC-ICP-MS coupled with a 193nm ArF excimer laser ablation system. Two analytical modes, static and dynamic measurement, are offered by Neptune Plus, with the dynamic model used for executing the analysis of quasi-simultaneous detection of isotopes.
2：Sample Selection and Data Sources
Well-characterized mineral reference materials (monazite, titanite, perovskite) with known U-Pb and Sm-Nd isotopic values were analyzed.
3：List of Experimental Equipment and Materials
Neptune Plus MC-ICP-MS (Thermo Fisher Scientific, Germany), 193nm ArF excimer laser ablation system (GeolasHD, Coherent, USA), helium as the carrier gas, nitrogen gas added into the carrier gas at 4 mL min-1.
4：Experimental Procedures and Operational Workflow
The laser fluence was set to 5 J cm-2 to 9 J cm-2 with laser repetition rate set to 6 to 10 Hz, and the spot sizes ranged from 16 μm to 90 μm. Two cup configuration lines were set up for U-Pb age and Sm-Nd isotopic ratios measurement.
5：Data Analysis Methods
For U-Pb age measurements, the software program ICPMSDataCal9.0 was used. For Sm-Nd isotopic measurements, the isobaric interference of 144Sm on 144Nd was corrected using the measured 147Sm/149Sm ratio.
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