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Integrated zircon U-Pb dating and whole rock geochemical analyses have been carried out for two typical S- and I-type granitoids in the north Qinling. Zircon dating by SIMS of the Piaochi S-type granitoids yields an emplacement age of 495±6 Ma. The granitoids show whole-rock ɛNd(t)=−8.2–−.8.8, zircon ɛHf(t)=−6–−39. The Huichizi I-type granitoids have emplacement ages...
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