Introduction: The Pb isotope system in feldspar isa powerful fingerprint, recording near-initial isotoperatios due to the very low ratios of U and Th to Pb inthis mineral group, especially in K-feldspar. This samemineral group also has demonstrated applicability for40Ar/39Ar geochronology. Procedures that allow multipleproxies to be obtained on the same samples have agreat deal of value, and the combination of age andinitial Pb isotope composition of feldspar has widepotential application in studies of volcanic stratigraphyas well as sedimentary provenance.