Zircon U-Pb ages, geochemistry and isotopic characteristics of the Chu Lai granitic pluton in the Kontum massif, central Vietnam
The Chu Lai granite contains alumina-rich minerals (garnet and muscovite), is depleted in Ba, Nb, Ta, Sr and Ti but enriched in Rb, Th, U and Pb. These geochemical characteristics indicate a S-type nature of the Chu Lai granite. The zircon ɛHf values vary between −16.7 to −1 and Hf model ages (TDM2) between 1.50 and 2.49 Ga as well as whole rock ɛNd values of −8.3 to −5.8 and Nd model ages (TDM2) between 1.67 and 1.89 Ga. The Hf-Nd isotope data indicate that the Chu Lai granite was derived from partial melting of Paleoproterozoic metasedimentary material. The LA-ICP-MS zircon U-Pb ages range from 445 Ma to 454 Ma, suggesting a crystallization of the Chu Lai granite during the Ordovician-Silurian period.