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In this work, a novel method for high spatial resolution U-Pb dating of zircon by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) at 10–16  μ m spot diameter has been proposed. This was achieved by introducing 2% ( v / v ) water-ethanol vapours into ICP in combination with the shielded torch system to increase the sensitivity and suppress the isotopic fractionation effect. Precise and accurate concordant U-Pb ages for Plešovice, GJ-1, and 91500 zircons were obtained using the proposed method, and the results agreed well with the isotope dilution-thermal ionization mass spectrometry (ID-TIMS) and LA-ICP-MS within 2 σ , except for the ages obtained using dry plasma at 10  μ m spot diameter. Additionally, the effects of plasma condition (dry plasma or 2% ( v / v ) ethanol plasma) and spot size (10, 16, 24, or 32  μ m) on precision (RSD), accuracy (RE), and uncertainty (2 σ ) of the  206 Pb/ 238 U ages have been studied. The results indicated that increasing the spot diameter and introducing 2% ( v / v ) water-ethanol vapours into ICP significantly improved the precision, accuracy, and uncertainty for small spot diameters (10 and 16  μ m), while it exhibited little influence for intermediate spot diameters (24 and 32  μ m). Furthermore, the effects of spot size and plasma condition on the precision, accuracy, and uncertainty strongly depended on the sensitivity of analytes.

Improvement in the Analytical Capabilities of LA-ICP-MS for High Spatial Resolution U-Pb Dating of Zircon Using Mixed-Gas Plasma