Abstract
The granites of ambiguous geodynamic mechanism in the Qin-Fang tectonic belt (SW China) were studied in detail based on petrological, element geochemical, zircon U-Pb geochronological, and Hf isotopic data. LA-ICPMS U-Pb analyses on zircon yield ages of 248–245 Ma for the granites from the Qin-Fang tectonic belt. The geochemical data show that they are high-K, calc-alkaline, and peraluminous series. Their εHf(t) values are from −14.01 to −7.75 with two-stage model ages of 1.74–1.43 Ga. These data, integrated with low Al2O3/TiO2, Rb/Sr, Rb/Ba, and (Na2O + K2O)/(FeOT + MgO + TiO2) ratios, and high CaO/Na2O ratios for the granite, suggest an origin from psammite source which was contaminated by mantle-derived components. These observations, in combination with the age data and stratigraphic records in the Jinshajiang, Ailaoshan, and Hainan Island areas suggest that the granites were formed in a post-collision tectonic setting. The Qin-Fang tectonic belt was likely a branched ocean basin of the eastern Paleo-Tethys.
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Acknowledgments
We thank Lianhua Ma and Xiaoqian Su for their support with field work, and Linxin Meng and Yichao Ma for assistance with chemical analyses. We are grateful to the reviewers for their valuable suggestions and constructive comments on this paper. This study was financially supported by the National Natural Science Foundation of China (No. 42372102), the Guangxi Natural Science Foundation Program (Nos. 2017GXNSFAA198209 and 2022GXNSFAA035620), and the Guangxi Key R&D Program (No. AB22035045). The final publication is available at Springer via https://doi.org/10.1007/s12583-020-1111-6.
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Zhou, Y., Zhao, Y., Cai, Y. et al. Permian-Triassic Magmatism in the Qin-Fang Tectonic Belt, SW China: New Insights into Tectonic Evolution of the Eastern Paleo-Tethys. J. Earth Sci. 34, 1704–1716 (2023). https://doi.org/10.1007/s12583-020-1111-6
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DOI: https://doi.org/10.1007/s12583-020-1111-6