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

Figure 2

(a) U-Pb concordia diagrams and ²⁰⁶Pb/²³⁸U ages of zircon SRM Plešovice determined under different experimental conditions. The blue solid line represents the weighted mean ²⁰⁶Pb/²³⁸U ages, while the dotted line represents the reference ²⁰⁶Pb/²³⁸U age of SRM Plešovice obtained from [16]. Uncertainties are represented by 2σ, while MSWD is the mean square of weighted deviations. Experimental conditions: (1) plasma conditions (dry plasma or 2% ethanol plasma), (2) spot sizes (10, 16, 24, or 32 μm). The concordance was lower than 90%, when dry plasma was used at the spot size of 10 μm.

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