Single-zircon evaporation combined with Pb + emitter bedding for 207 Pb/ 206 Pb-age investigations using thermal ion mass spectrometry, and implications to zirconology

摘要: The internal precision of Pb isotope analyses using single-zircon evaporation in a double-filament solid source mass spectrometer (Kober 1986) can be improved combining the directly from single grain with suitable Pb+ emitter-bedding technique. This is most easily done by step-wise evaporating investigated at temperatures 1700–1800 K generating on ‘cold’ ionization filament deposit radiogenic together further elements and compounds derived crystal. heating to 1400–1500 results long-lived stable ion beams. ‘activating reagents’ are HfO2 SiO2. Their release zircon Pb, which presumably sited crystalline domains as Pb4+, probably due disintegration reactions trace-element silicates hosted grain.