Abstract
The Zhunuo porphyry copper deposit in the Gangdese belt of southern Tibet contains 2.37 Mt at 0.57% Cu. In this deposit, Eocene rhyolite (51.6 ± 1.0 Ma) and quartz porphyry (49.1 ± 0.6 Ma) were intruded by monzogranite (14.7 ± 0.3 Ma) and monzogranite porphyry (14.5 ± 0.2 Ma) which commonly host mafic microgranular enclaves (14.9 ± 0.3 Ma). Late-mineralization diorite porphyry (14.2 ± 0.2 Ma) and post-mineralization lamprophyre dikes (12.2 ± 0.1 Ma) and granite porphyry (12.0 ± 0.2 Ma) crosscut the Miocene intrusions. Two quartz–molybdenittie veins yielded molybdenite Re-Os model ages of 14.8 ± 0.1 Ma and 14.4 ± 0.1 Ma, and another two quartz–muscovite–llite–pyrite–molybdenite veins yielded molybdenite Re-Os model ages of 14.2 ± 0.1 Ma and 13.5 ± 0.1 Ma. Zhunuo is characterized by early potassic alteration and associated quartz A veins centered on the monzogranite porphyry and adjacent monzogranite, distal propylitic alteration in the rhyolite, and late-stage phyllic alteration and associated quartz B veins, followed by D veins that affected quartz porphyry and potassic-altered rocks. Copper ores are mainly distributed in the potassic alteration zone that was overprinted by phyllic alteration. Copper mineralization likely occurred during potassic alteration stage and was locally remobilized and redeposited during phyllic alteration stage, or occurred during phyllic alteration stage. The post-mineralization granite porphyry has lower whole-rock Sr/Y (< 20) and εNd(t) (− 9.3 to − 9.0) and higher zircon U/Yb (4 to 27) than the Miocene intrusions (Sr/Y > 40; εNd(t) = − 6.9 to − 6.1; U/Yb = 1 to 10). Limited input of juvenile melts could explain the low potential for copper mineralization in the post-mineralization granite porphyry at Zhunuo.
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Acknowledgments
Constructive comments on an earlier draft of the manuscript by David Cooke and Zhi-ming Yang are gratefully acknowledged. This paper also benefited from Zhi-ming Yang, an anonymous reviewer, and editorial handling by Huayong Chen and Georges Beaudoin. You-ye Zheng and Guang-wu Jiang are thanked for providing access to the mine site and drill cores. Some master students (e.g., Zhi-min You, Song Wu, Jian-dong Li, Miao Li) are thanked for joint geological work and sample selection. We thank Bin Shi for the quartz CL images and Yali Sun for Re-Os isotope analyses.
Funding
Funding for this project was jointly granted by the National Key Research and Development Project of China (2016YFC0600305, 2017YFC0601506), National Natural Science Foundation of China (41302063, 41772077, 41973040), Program of the China Geological Survey (1212011220927), Project from the Ministry of Land and Resources (201511015), Changjiang Scholars and Innovative Research Team in University (IRT14R54), the 111 Project of the Ministry of Science and Technology (BP0719021), and Fundamental Research Funds for the Central Universities. Yongjun Lu acknowledges a Tibet pilot project from the ARC (Australian Research Council) Centre of Excellence for Core to Crust Fluid Systems (CCFS; CE110001017). This is contribution 1204 from the ARC Centre of Excellence for Core to Crust Fluid Systems (www.CCFS.mq.edu.au). Yongjun Lu publishes with the permission of the Executive Director of the Geological Survey of Western Australia.
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Sun, X., Hollings, P. & Lu, YJ. Geology and origin of the Zhunuo porphyry copper deposit, Gangdese belt, southern Tibet. Miner Deposita 56, 457–480 (2021). https://doi.org/10.1007/s00126-020-00970-0
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DOI: https://doi.org/10.1007/s00126-020-00970-0