Abstract
The Late Paleozoic and Mesozoic tectonic framework of the Nanpanjiang Basin has much been disputed. Herein, the middle-acid volcanic rock, dacite, exposed to the Zhesang gold district, southeast Yunnan Province, has been analyzed. The results show that the dacite belongs to a calc-alkaline series, SiO2 contents range from 62.79 to 76.66 wt%. Zircon SHRIMP U–Pb dating of dacite demonstrates that they were formed in the Early Triassic (247.8 ± 1.7 Ma, MSWD = 1.2). All samples exhibit enrichment in LILE (e.g. Rb, K, Th, and U), and depletion in HFSE (e.g. Nb, Ta, and Ti), which has the geochemical affinity of I-type granite. La–La/Sm and La–La/Yb discrimination diagrams show that the partial melting, mainly of the mafic lower crust, of rocks, plays a major role in the formation process. The dacite has low initial 87Sr/86Sr ratios (0.706954 to 0.708589) and negative εNd(t) values (− 11.77 to − 10.88). Zircons in dacite have εHf(t) values of − 16.2 to − 8.3, and the two-stage Hf model ages are 1799–2301 Ma, mostly concentrated between 1800 and 1900 Ma, indicating that the magma source area is the reconstructed ancient lower crust mixed with some mantle materials, and crystal fractionation process underwent in the late stage of magma migration. This study reveals that the arc-volcanic rocks of the Early Triassic in the southern margin of the Nanpanjiang Basin were formed by the subduction of the Late Paleozoic ocean basin within the border region between China and Vietnam.
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Acknowledgements
This research is jointly supported by the Open Fund for Sanjiang Key Laboratory of Mineralization and Resource Exploration and Utilization, Ministry of Natural Resources (ZRZYBSJSYS2021002), Yunnan Major Scientific and Technological Projects (Grant No. 202202AG050006) and the National Natural Science Foundation of China (No. 41772070). SHRIMP zircon U-Pb dating and Hf isotope analysis were assisted and supported by the National Research Center of Geoanalysis (NRCG), Chinese Academy of Geological Sciences (CAGS). The major and trace element analyses were completed in the Aoshi Geologic Service, Guangzhou, China. We are grateful to Mr. Zhipeng **e for his valuable suggestions on this manuscript. The constructive comments from two anonymous reviewers are highly appreciated.
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Wang, B., Wang, J., Li, J. et al. Zircon SHRIMP U–Pb geochronology, geochemistry, and geological significance of dacite in the Zhesang gold district, southeast Yunnan Province, China. Acta Geochim 42, 290–308 (2023). https://doi.org/10.1007/s11631-022-00584-5
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DOI: https://doi.org/10.1007/s11631-022-00584-5