Abstract
The Early Cretaceous aluminous A-type granites in the Lower Yangtze River belt (LYRB) can provide important insights into the Mesozoic magmatism in eastern China, but their origin remains highly controversial. In this study, radiogenic Ca-Nd isotopic analysis was performed for syenite porphyry and alkali-feldspar granite porphyry of the Yangshan pluton, a typical aluminous A-type granitic intrusion in the LYRB, to constrain its source and geodynamic setting. The results show that εCa(126 Ma), εNd(126 Ma) and K/Casource of the syenite porphyry range from −0.24 to +0.96, −7.2 to −6.0, and 0.31 to 1.26, respectively. The corresponding values for the alkali-feldspar granite porphyry range from 0.26 to 0.84, −8.0 to −6.1, and 0.79 to 1.08, respectively. Binary mixing modeling indicates that they were originated from the same sources with different proportion, namely, a mixing of 50% to 75% Neoproterozoic crust and 50% to 25% asthenospheric mantle. Together with previous works, we propose that the Early Cretaceous subduction of the ridge between the Pacific and Izanagi plates was responsible for the formation of the aluminous A-type granites in the LYRB.
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Acknowledgments
This study was supported by the Jiangxi Double Thousand Plan, the State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang (No. 2020Z03), the National Key R & D Program of China (Nos. 2016YFC0600408, 2019YFA0708400), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB41020102). The authors are extremely grateful to the two anonymous reviewers, whose constructive comments greatly improved the manuscript. Thanks also go to Lei Liu of Central South University for sharing the Neoproterozoic samples, and Yajun An, Xin Li, Jie Li, Wen Zeng, Long Ren and Qiwei Li and Xiao Liu of the State Key Laboratory of Isotope Geochemistry for helping with isotopic analyses and discussions. This is contribution No. IS-3081 from GIG-CAS. The final publication is available at Springer via https://doi.org/10.1007/s12583-021-1588-7.
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Bai, J., Ling, M., Yang, X. et al. Yangshan A-Type Granites in the Lower Yangtze River Belt Formed by Ridge Subduction: Radiogenic Ca and Nd Isotopic Constraints. J. Earth Sci. 33, 581–590 (2022). https://doi.org/10.1007/s12583-021-1588-7
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DOI: https://doi.org/10.1007/s12583-021-1588-7