Abstract
The Chu Lai granite is widespread throughout the northern Kontum massif and is an important key in understanding the evolution of the Kontum region and its vicinity. The study presents new data on geochemistry, zircon U-Pb ages, and Nd-Hf isotopes from the Chu Lai granite which allows to constrain the Paleozoic tectonic evolution of the Kontum massif. 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.
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Acknowledgments
This study was supported by the Vietnam Academy of Science and Technology (VAST) [Project code BSTMV.06/14-16, VAST05.02/19-20 and TN17/T06] and Project code No.105.05-2010.01. Thanks are due to Prof. Fukun Chen and Wang W for assistance during chemical and isotopic analyses. The manuscript benefits greatly from the constructive and helpful review from Dr. N Nakano and the authors thank the editorial handling by Dr. Christoph Hauzenberger and Prof. Maarten Broekmans.
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Minh, N.T., Dung, N.T., Hung, D.D. et al. Zircon U-Pb ages, geochemistry and isotopic characteristics of the Chu Lai granitic pluton in the Kontum massif, central Vietnam. Miner Petrol 114, 289–303 (2020). https://doi.org/10.1007/s00710-020-00707-x
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DOI: https://doi.org/10.1007/s00710-020-00707-x